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TABLE OF CONTENTS
1.0 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.1 SYSTEM COVERAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11.2 SIX-STEP TROUBLESHOOTING PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . .1
2.0 IDENTIFICATION OF SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
3.0 SYSTEM DESCRIPTION AND FUNCTIONAL OPERATION . . . . . . . . . . . . . . . . . . . . . .1
3.1 TEVES MARK 25E SYSTEM DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13.2 TRACTION CONTROL SYSTEM (TCS) DESCRIPTION (IF EQUIPPED) . . . . . . .13.3 SYSTEM COMPONENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
3.3.1 ABS AND BRAKE WARNING INDICATORS . . . . . . . . . . . . . . . . . . . . . .23.3.2 ANTI-LOCK BRAKE MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23.3.3 HYDRAULIC CONTROL UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23.3.4 ABS SWITCHES/SENSORS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33.3.5 ABS INITIALIZATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33.3.6 ABS DIAGNOSTIC MODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33.3.7 TRACTION CONTROL OPERATION (IF EQUIPPED) . . . . . . . . . . . . . .4
3.5 DIAGNOSTIC TROUBLE CODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43.6 FREEZE FRAME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43.7 DRBIII ERROR MESSAGES AND BLANK SCREEN . . . . . . . . . . . . . . . . . . . . . .4
3.7.1 DRBIII DOES NOT POWER UP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43.7.2 DISPLAY IS NOT VISIBLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
4.0 DISCLAIMERS, SAFETY, WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
4.1 DISCLAIMERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54.2 SAFETY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
4.2.1 TECHNICIAN SAFETY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . .54.2.2 VEHICLE PREPARATION FOR TESTING. . . . . . . . . . . . . . . . . . . . . . . .5
4.2.3 SERVICING SUB-ASSEMBLIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54.2.4 DRBIII SAFETY INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
4.3 WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64.3.1 VEHICLE DAMAGE WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64.3.2 ROAD TESTING A COMPLAINT VEHICLE . . . . . . . . . . . . . . . . . . . . . . .6
4.4 DIAGNOSIS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
5.0 REQUIRED TOOLS AND EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
6.0 GLOSSARY OF TERMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
7.0 DIAGNOSTIC INFORMATION AND PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
BRAKES (25E)ABM INTERNAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10BATTERY VOLTAGE OUT OF RANGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12BCM MESSAGES NOT RECEIVED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14INSTRUMENT CLUSTER BULB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15LEFT FRONT WHEEL SPEED SENSOR CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . .17REAR WHEEL SPEED SENSOR CIRCUIT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17RIGHT FRONT WHEEL SPEED SENSOR CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . .17LEFT FRONT WHEEL SPEED SENSOR SIGNAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22REAR WHEEL SPEED SENSOR SIGNAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
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TABLE OF CONTENTS - Continued
RIGHT FRONT WHEEL SPEED SENSOR SIGNAL . . . . . . . . . . . . . . . . . . . . . . . . . . . .22LONGITUDINAL ACCELERATION SENSOR CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . .25LONGITUDINAL ACCELERATION SENSOR SIGNAL . . . . . . . . . . . . . . . . . . . . . . . . . .25MIC MESSAGES NOT RECEIVED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26PCI BUS COMMUNICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28PCI BUS LOOPBACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31PCI BUS SHORTED TO GROUND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
PCI BUS SHORTED TO VOLTAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36PCI HARDWARE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39PCM MESSAGES NOT RECEIVED. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41PUMP MOTOR CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43TCM MESSAGES NOT RECEIVED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45
COMMUNICATION*NO RESPONSE FROM ANTILOCK BRAKE MODULE . . . . . . . . . . . . . . . . . . . . . . . . .46
VERIFICATION TESTSVERIFICATION TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .48
8.0 COMPONENT LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
8.1 ANTI-LOCK BRAKE MODULE HYDRAULIC CONTROL UNIT,PUMP MOTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
8.2 WHEEL SPEED SENSORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .498.3 WHEEL SPEED SENSOR CONNECTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .498.4 BRAKE LAMP SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .508.5 BRAKE LAMP SWITCH CONNECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50
9.0 CONNECTOR PINOUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
ANTI-LOCK BRAKE MODULE - 47 WAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .51
DATA LINK CONNECTOR - BLACK 16 WAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52LEFT FRONT WHEEL SPEED SENSOR (ABS) - BLACK 2 WAY . . . . . . . . . . . . . . . . .52REAR WHEEL SPEED SENSOR - BLACK 2 WAY. . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
10.0 SCHEMATIC DIAGRAMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .53
10.1 TEVES MARK 25e ANTI-LOCK BRAKE MODULE . . . . . . . . . . . . . . . . . . . . . . . .53
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1 .0 I N T ROD UC T I ON
The procedures contained in this manual include
all the specifications, instructions, and graphics
needed to diagnose the Mark 25e Antilock Braking
System (ABS). The diagnostics in t his ma nua l ar e
based on the failure condition or symptom being
present at time of diagnosis.
Please follow the recommendations below whenchoosing your diagnostic path.
1 . F i r s t m a k e s u r e t h e D R BI I I is communicating
with the Anti-Lock Bra ke Module (ABM). If t he
DRBIII displays a No Response condit ion, you
must diagnose that first .
2. Read an d r ecord DTCs (diagnostic t rouble codes)
and Fr eeze Fram e inform at ion with th e DRBIII.
3. If no DTCs are present, identify t he customer
complaint.
4. Once t he DTC or customer complaint is identi-
fi ed , l oca t e t h e m a t c h in g t e s t i n t h e Ta b le of
Contents and begin t o diagnose the symptom.All component location views are in Section 8.0.
All connector pinouts are in Section 9.0. All sche-
matics are in Section 10.0.
An asterisk (*) placed before the symptom de-
scription indicates a concern with no associated
DTC.
When repairs a re r equired, refer t o the a ppropri-
a t e s er vice m a n u a l for t h e p r op er r e m ova l a n d
repair procedure.
Diagnostic procedures change every year. New
diagnostic systems may be added; carry over sys-
t e m s m a y b e e n h a n c ed . R E A D T H I S M AN U AL
BEFORE TRYING TO DIAGNOSE A VEHICLE
C OD E . I t is r e com m en d ed t h a t you r e vi ew t h e
entire man ual t o become familiar with all new and
cha nged diagnostic procedures.
After using this book, if you have any comments
or recommendations, please fill out the form at the
back of the book and mail it back to us.
1. 1 SYSTEM COVERAGE
T h is d ia g n os t ic p r oce d u r e m a n u a l cov er s t h e
Teves Mark 25e Antilock Braking System (ABS)
found on the 2005 KJ .
1. 2 SIX-STEP TROUBLESHOOTINGPROCEDURE
Diagnosis of the controller antilock brake module
is done in six basic steps:
verification of complaint
verificat ion of any r elated symptoms
symptom analysis
problem isolation
repair of isolated problem
verification of proper operation
2 . 0 I D EN T I F I C AT I ON OFSYSTEM
Vehicles equipped with the Teves Mark 25e an-
tilock brake system can be identified by the pres-ence of the antilock brake module with a 47-way
connector.
The presence of th e Traction Control system is
indicated by the switch and bulb check.
3 . 0 SYST EM D ESCR I PT I ON A N DFUNCTIONAL OPERATION
3.1 TEVES MARK 25E SYSTEMDESCRIPTION
The Antilock Brake Module (ABM) is used to
monitor wheel speeds a nd to m odulate (control)
h yd r a u lic p r es su r e in e a ch b r a ke ch a n n e l. T h e
m od u la t e d h y dr a u l ic p r e ss u r e i s u s e d t o p r e ve n t
wheel lock-up during braking.
The Teves Mark 25e system uses a diagonal split
h yd r a u lic b r a ke s ys t em . I n t h e s t a n da r d b r a ke
mode the master cylinder primary circuit supplies
p r es su r e t o t h e r ig ht fr on t a n d le ft r e a r w h ee l
brakes, and the secondary master cylinder circuit
s u p p l i e s p r e s s u r e t o t h e l e f t f r o n t a n d r i g h t r e a r
wheel brakes.
All vehicles equipped with ABS use Electronic
Variable Brake Proportioning (EVPB) to balance
front-to-rear braking when brakes are applied in
the partial braking range.
3. 2 TRACTION CONTROL SYSTEM (TCS)DESCRIPTION (IF EQUIPPED)
The main purpose of traction control is to reduce
w h ee l s l ip a n d m a in t a in t r a ct ion a t t h e d r ive n
wheels when road surfaces are slippery. The trac-
tion control system reduces wheel slip by braking
t h e w h e el t h a t i s l os in g t r a c t ion . T h e s y s t em i sdesigned to operate at speeds below 56 km/h (35
mph).
3.3 SYSTEM COMPONENTS
AB S
anti-lock brake module (ABM)
vacuum booster
master cylinder
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integrated hydraulic control unit (HCU), 1 pump
motor.
4 wheel speed sensor/tone wheel assemblies
ABS warning indicator
fuses and wiring harness
fluid reservoir
brake lamp switch
ABS With Traction Control
ABM with Traction Control programming
HCU with four additional control valves.
TCS Switch
TCS In dicator
3. 3.1 ABS AND BRAKE WARNING
INDICATORS
The amber ABS warning indicator is located in
t h e i n st r u m e n t cl u st e r. I t i s u s e d t o i n for m t h e
driver that the antilock function has been turnedoff. The ABS war ning indicator is contr olled by t he
ABM. The ABM cont rols the lam p with a comman d
over the PCI bus.
The ABS Warn ing Indicator will rema in lit dur ing
every key cycle until a circuit or component fault is
repaired and the ABM no longer detects the fault .
After repair of a sensor signal fault or a pump motor
f a u l t , t h e A B M m u s t s e n s e a l l f o u r w h e e l s a t 2 5
km/h (15 mph) before it will extinguish the ABS and
TCS Indicator.
The Instr ument Cluster will i lluminate t he ABS
Warn ing In dicator if it loses commu nicat ion with
th e ABM.The r ed BRAKE war ning indicator is a lso locat ed
i n t h e i n st r u m e n t cl u s t er . I t ca n b e a c t iv a t ed i n
several ways. Applicat ion of th e par king bra ke or a
low fluid signal from t he fluid level switch locat ed in
the master cylinder reservoir will cause the indica-
tor t o come on.
3. 3.2 ANTI-LOCK BRAKE MODULE
The ABM is a microprocessor-based device that
monitors wheel speeds a nd controls t he ant ilock
functions. The ABM contains two microprocessors
that receive identical sensor signals and then inde-pendently process the information. The results are
t h e n com p a r e d t o m a k e s u r e t h a t t h e y a g r ee . O t h -
erwise, the ABM will turn off the antilock and turn
on the ABS amber warning indicator.
The primary functions of the ABM are to:
detect wheel locking tendencies
control fluid pressure modulation to the brakes
during antilock stop
monitor the system for proper operation
manage traction control functions
provide communication to the DRBIII while in
diagnostic mode
store diagnostic information in non-volatile mem-
or y
T h e AB M con t i n u ou s ly m on i t or s t h e s p ee d of
e a ch w h e el . W h e n a w h ee l l ock i n g t e n d en cy i s
detected, the ABM will command the appropriate
v a l v e t o m o d u l a t e b r a k e f l u i d p r e s s u r e i n i t s h y -
d r a u l ic u n i t . B r a k e p e da l p os it i on i s m a i n t a in e dduring an antilock stop by being a closed system.
The ABM continues to control pressure in individ-
u a l h y d r a u li c c ir cu i t s u n t i l a w h e el l ock in g t e n -
dency is no longer present. The ABM turns on the
pump motor during an antilock stop.
The a ntilock brake system is constan tly moni-
tored by t he ABM for proper operat ion. If the ABM
d e t ect s a s ys t e m m a l fu n c t ion , i t ca n d is a b le t h e
a n t ilock s ys t em a n d t u r n on t h e A BS w a r n in g
indicator. If t he ant ilock function is disabled, the
system will revert to standard base brake system
operation.
The ABM input s include the following:
diagnostic communication
four wheel speed sensors
three power feeds: valve, pump, and microproces-
sor
brake lamp switch
traction control switch
The ABM outpu ts include th e following:
ABS warning indicator actuation
12 volts power to wheel speed sensors
valve actuation diagnostic communication
PCI bus communication
traction control lamp illumination
3. 3.3 HYDRAULIC CONTROL UNIT
The hydraulic contr ol u nit (HCU) contains the
valve block a ssembly, a nd pump /motor a ssembly.
The HCU is atta ched to th e ABM.
Va l v e B l o c k A s s e m b l y : The va lve block assem-
bly contains valves with four inlet valves and four
outlet valves. The inlet valves are spring-loaded in
the open position and the outlet valves are springloaded in the closed position. During an ant ilock
stop, these valves are cycled to mainta in th e proper
slip r atio for each wheel. If a wh eel detects slip, the
inlet valve is closed to prevent an d furth er pressu re
increase. Then t he outlet valve is opened to release
the pr essure to the a ccumulators un til the wheel is
n o l on g er s li pp in g . O n ce t h e w h e el i s n o l on g er
slipping, the outlet valve is closed a nd the inlet
valve is opened to reapply pressure. If the wheel is
d ece le r a ti n g w it h in it s p r ed et e r m in e d l im it s
(proper slip ratio), the inlet valve will close to hold
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t h e p r es su r e con s t a n t . O n v eh icle s w h ich a r e
equipped with a tra ction control system, there are
four a dditiona l valves, two isolat e th e m aster cylin-
der an d two shut tle. During a tr action contr ol event
the brakes are applied to r educe wheel slippage.
P u m p M o t o r A s s e m b l y : T h e p u m p m o t o r a s -
sembly pr ovides t he extra amount of fluid needed
durin g ant ilock br aking. The pu mp is su pplied fluid
tha t is released to th e accum ulators when t he outletvalve is opened during an antilock stop. The pump
is also used to drain the accumulator circuits after
the ant ilock st op is complete. The pu mp is operat ed
by a n integral electric motor. This motor is con-
t r ol le d b y t h e A BM . T h e AB M m a y t u r n on t h e
pump motor when an antilock stop is detected. The
pump continues to run during the antilock stop and
is tur ned off after th e stop is complete. Under some
con d it i on s , t h e p u m p m ot or w il l r u n t o d r a i n t h e
accumulators during the next drive off. The ABM
monitors the pump motor operation internally.
3.3. 4 ABS SWITCHES/SENSORSM a s t e r C y l i n d e r : The master cylinder is a stan-
dard ta ndem compensating port design for ABS an d
non ABS systems. Traction cont rol vehicles u se a
dual center port master cylinder. For proper trac-
tion control operation the standard master cylinder
must not be used.
A f lu i d l ev el s w it ch i s l oca t e d i n t h e m a s t e r
cylinder fluid reservoir. The switch closes when a
low fluid level is detected. The fluid level switch
turn s on th e brake warning indicator by grounding
the indicator circuit. This switch does not disable
the ABS system.Wh e e l S p e e d S e n s o r s a n d To n e Wh e e l s : On e
active wh eel speed sensor (WSS) is located a t each
w h e el . T h e s e n sor s u s e a n e le ct r on i c p r in ci pl e
known a s m agneto-resistive to help increase perfor-
m a n c e, d u r a b il it y a n d l ow s p ee d a ccu r a c y. T h e
sensors convert wheel speed into a small digital
s ig n a l. A t oot h e d g ea r t on e w h e el s e r ve s a s t h e
trigger mechanism for each sensor.
The ABM sends 12 volts to power a n Integrated
Circuit (IC) in the sensor. The IC supplies a con-
stant 7 m A signal to the ABM. The relationship of
t h e t oot h on t h e t on e w he el t o t h e p er m a n en t
magnet in th e sensor, signa ls the IC of the sen sor totoggle a second 7 mA power supply on or off. The
ou t p u t of t h e s en s or, s en t t o t h e AB M, is a D C
voltage signal with changing voltage and current
levels. The ABM monitors the changing amperage
(digital signal) from each wheel speed sensor. The
resulting signal is interpreted by the ABM as the
wheel speed.
B e c a u s e o f i n t e r n a l c i r c u i t ry, c o r r e c t w h e e l
s p e e d s e n s o r f u n ct i on c a n n o t b e d e t e rm i n e d
b y a c o n t i n u i t y o r r e s i s t a n c e c h e c k t h r o u g h
t h e s e n s o r .
Correct ant ilock system operation is dependent
on tone wheel speed signals from the wheel speed
sensors . The vehicles wheels a nd t ires sh ould all be
the sa me size an d type to genera te accur ate signals.
I n a d d it ion , t h e t ir e s s h ou ld b e in fla t e d t o t h e
recommended pressure for optimum system opera-
tion. Variation in wheel and tire size or significant
variations in inflation pr essure can produce ina ccu-
rate wheel speed signals; however, the system willcontinue to function when using t he correct factory
mini-spare.
3.3.5 ABS INITIALIZATION
S ys t em i ni tia li za t ion s t a r t s w h en t h e k e y is
turned to run. At this point, the ABM performs a
complete self-check of all electrical components in
the antilock systems.
Between 8-17 km/h (5-10 mph ), a dynam ic test is
performed. This will momenta rily cycle the inlet
and outlet valves, check wheel speed sensor cir-
cu it r y, a n d r u n t h e p u m p m o t or a t 2 5 k m /h (1 5
mph). The ABM will try to test the pump motor. If
the brak e pedal is applied the t est will be run at 40
km/h (24 mph) regardless of brake switch state. If,
during the dynamic test, the brake pedal is applied,
t h e d r i v e r m a y f e e l t h e t e s t t h r o u g h b r a k e p e d a l
pulsations. This is a normal condition.
If a ny component exhibits a trouble condition
during system initialization or dynamic check, the
ABM will i lluminate the ABS warning indicator
and TCS Indicator, if equipped.
3.3.6 ABS DIAGNOSTIC MODE
To enter diagnostic mode, a vehicle speed must beb el ow 1 0 k m /h (6 m p h ) a n d n o A BS con d it i on
p r e se n t . I f v e h icl e s p e e d i s n ot b el ow 1 0 k m /h
(6 mph), a No Response message could be dis-
played by the DRBIII. The following are charac-
teristics of diagnostic mode:
The a mber ABS warning indicator will blink
rapidly. If a ha rd t rouble code, such as Batt ery
Vol t a ge O u t of R a n ge cod e i s p r e se n t , t h e
indicator will be illuminated without blinking
until the trouble condition is cleared.
Antilock operat ion is disabled.
The HCU valves cann ot be actua ted when thevehicle speed is above 8 km/h (5 mph). If valve
actua tion is a ttem pted a bove 8 km/h (5 mph), a
No Response message will be displayed on
the DRBIII.
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3. 3. 7 TRACTION CONTROL OPERATION
(IF EQUIPPED)
The Anti-lock Brake Module (ABM) monitors
wheel speeds. If , during acceleration, the module
detects front (drive) wheel slip and the brakes a re
not applied, th e ABM will ent er traction control
mode. Traction control works in the following order
when drive wheel slip is detected.1. Close t he (norma lly open) isolation valves.
2. Start pump/motor an d supply volume/pressure
to front hydraulic circuits (pump runs continu-
ously during tra ction cont rol).
3. Open an d close build a nd decay valves t o main-
t a i n m i n i m u m w h e e l s l i p a n d m a x i m u m t r a c -
tion.
T h e cy cl in g of t h e b u il d a n d d e ca y v a lv es i s
similar to the ABS except that they work to control
wheel spin by applying brakes. ABS function is to
control wheel skid by releasing brakes.
Two pressure relief valves allow excess fluid vol-ume to return to the reservoir when not used by the
build/decay cycles. These are required because the
pump supplies more volume th an the traction con-
trol system requires.
If at any t ime the brake pedal is applied during a
traction contr ol cycle, the brake lamp switch will
trigger t he ABM to switch off th e t raction control.
The traction contr ol system will be enabled at
each ignition cycle. It may be turned off by depress-
ing the Traction Control Switch. The traction con-
trol system function lamp will illuminate Traction
Control immediately u pon depressing t he traction
cont rol switch butt on. The indicator will illum inateduring a traction control event.
I f t h e A B M c a l c u l a t e s t h a t t h e b r a k e t e m p e r a -
t u r e s a r e h i gh , t h e t r a c t ion con t r o l s y st e m w il l
b ecom e i n op e r a t iv e u n t i l a t i m e-ou t p e r iod h a s
elapsed. When in this thermal protection mode, the
tra ction cont rol indicator will illumina te; h owever,
a fault will not be registered.
3. 5 DIAGNOSTIC TROUBLE CODES
The Anti-lock Brake Module may report any of
several Diagnostic Trouble Codes (DTC)s.
3.6 FREEZE FRAME
Freeze F ra me ta kes a snap shot of specific vehi-
cle informa tion th e insta nt an ABS failure is r ecog-
n i ze d a n d s t or e s t h i s i n for m a t i on i n t o t h e AB M
memory. This information can be accessed using the
DRBIII to help diagnose the fault . Freeze Frame
w il l ca p t u r e t h e fi r st t i m e f a il u r e o r on l y a n e w
failure t ha t occur s dur ing the current ignition cycle.
3.7 DRBIII ERROR MESSAGES ANDBLANK SCREEN
Under normal operation, the DRBIII will dis-
play one of only two error messages:
U ser -Requ es ted WARM Boot or U ser -
Requested COLD Boot.
I f t h e D R B I I I should display any other error
m e s sa g e, r e cor d t h e e n t ir e d is p la y a n d ca l l t h e
S TAR C en t e r. T h is i s a s a m p le of s u c h a n e r r or
message display:
ver: 2.14date: 26 J ul93file: key_itf.ccdate: Ju l 26 1993line: 548err. 0x1User-Requested COLD bootPress MORE to switch between this display
and the application screen.Press F4 when done noting information.
3.7.1 DRBIII DOES NOT POWER UP
If the LEDs do not light or n o soun d is emitt ed at
sta rt up, check for loose cable connections or a bad
cable. Check the vehicle battery voltage (data link
connector cavity 16). A minimum of 11 volts is
required to a dequately power the DRBIII.
I f a l l con n e ct i on s a r e p r op e r a n d t h e v eh i cl e
battery is fully charged, an inoperative DRBIII
may be the result of faulty cable or vehicle wiring.
3.7.2 DISPLAY IS NOT VISIBLE
Low t emperat ures will a ffect th e visibility of the
display. Adjust the contrast to compensate for this
condition.
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4.0 DISCLAIMERS, SAFETY,WARNINGS
4.1 DISCLAIMERS
All information, illustrations, and specifications
c o n t a i n e d i n t h i s m a n u a l a r e b a s e d o n t h e l a t e s t
informat ion available a t the t ime of publication.The right is reserved to make changes at any t ime
without notice.
4.2 SAFETY
4. 2. 1 TECHNICIAN SAFETY INFORMATION
WARNING: ENGINES PRODUCE CARBONMONOXIDE THAT IS ODORLESS, CAUSESSLOWER REACTION TIME, AND CAN LEAD
TO SERIOUS INJURY. WHEN THE ENGINE ISOPERATING, KEEP SERVICE AREAS WELLVENTILATED OR ATTACH THE VEHICLEEXHAUST SYSTEM TO THE SHOP EXHAUSTREMOVAL SYSTEM.
Set th e park ing brake an d block th e wheels before
t e s t in g or r e p a ir i n g t h e v eh i cl e. I t i s e s pe ci a ll y
important to block the wheels on front-wheel drive
vehicles; the parking brake does not hold the drive
wheels.
When servicing a vehicle, always wear eye pro-
t e ct i on , a n d r e m ov e a n y m e t a l je we lr y s u ch a s
rings, watchbands or bracelets t hat might make a n
inadverten t electr ical cont act.When diagnosing a chassis problem, it is impor-
tant to follow approved procedures where applica-
ble. These procedures can be found in the service
manual. Following these procedures is very impor-
tant to the safety of individuals performing diag-
nostic tests.
4. 2. 2 VEHICLE PREPARATION FOR
TESTING
M a k e s u r e t h e v e h i c l e b e i n g t e s t e d h a s a f u l l y
char ged bat ter y. If it does n ot, false dia gnostic codes
or error messages may occur.
4.2. 3 SERVICING SUB-ASSEMBLIES
Some components of the chassis system are in-
tended to be serviced as an assembly only. Attem pt-
in g t o r em ove or r ep a ir ce rt a in s ys t em s u b-
components may result in personal injury and/or
improper system operat ion. On ly those component s
with appr oved repair a nd inst allation pr ocedures in
the service manual should be serviced.
4.2.4 DRBIII SAFETY INFORMATION
WARNING: EXCEEDING THE LIMITS OF THEDRBIII MULTIMETER IS DANGEROUS. ITCAN EXPOSE YOU TO SERIOUS ORPOSSIBLY FATAL INJURY. CAREFULLYREAD AND UNDERSTAND THE CAUTIONS
AND THE SPECIFICATION LIMITS. Follow t he vehicle man ufacturer s service speci-
fications at all times.
Do not use t he DRBIII if i t ha s been dam aged.
D o n ot u s e t h e t e st le a ds if t h e in s u la t ion is
damaged or if metal is exposed.
To a void electrical shock, do n ot touch the test
leads, tips, or the circuit being tested.
Choose th e proper ra nge an d functions for the
measurement. Do not try voltage or current mea-
surements tha t may exceed the rated capacity.
Do not exceed the limits shown in the table below:F U N CTION IN P U T LIMIT
Volt s 0 - 500 pea k volt s AC
0 - 500 volts DC
O h m s (r e sis t a n ce )* 0 -1 .1 2 m e goh m s
Frequency Measured
Frequency Generated
0 - 1 0 k H z
Tem per a t u r e -58 - 1100F
-50 - 600C
* Ohms cannot be measured if voltage is present.
Ohms can be measured only in a non-powered
circuit.
Voltage between any terminal and ground must
not exceed 500v DC or 500v peak AC.
Use caut ion when measuring voltage above 25v
DC or 25v AC.
Use the low current shunt to measure circuits up
to 10A. Use the high current clamp to measure
circuits exceeding 10A.
When testing for the presence of voltage or cur-
r e n t , m a k e s u r e t h e m e t er i s f u n ct i on i n g c or -
r e ct l y. Ta k e a r e a d in g of a k n ow n v ol t a ge or
current before accepting a zero reading. When measuring current, connect the meter in
series with the load.
Disconnect the live test lead before disconnecting
the common test lead.
Wh en u sin g t h e m et er fu n ct ion , k eep t h e
DRBIII away from spark plug or coil wires to
avoid m easur ing error from outside int erference.
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4.3 WARNINGS
4. 3.1 VEHICLE DAMAGE WARNINGS
Before disconnecting any control module, make
sur e the ignition is off. Fa ilur e to do so could
damage t he m odule.
When t esting voltage or continu ity at an y control
module, use the terminal side (not the wire end) oft h e con n e ct or . D o n o t p r ob e a w ir e t h r o u gh t h e
insulat ion, th is will dam age it and event ua lly cau se
it to fail because of corrosion.
Be careful when performing electrical tests so as
to prevent accidental shorting of terminals. Such
mistakes can damage fuses or components. Also, a
second code could be set, making diagnosis of the
original problem more difficult.
4. 3.2 ROAD TESTING A COMPLAINT
VEHICLE
Some complaints will require a test drive as part
of the repair verificat ion procedure. Th e pu rpose of
the test drive is to try to duplicate the diagnostic
code or symptom condition.
WARNING: BEFORE ROAD TESTING AVEHICLE, BE SURE THAT ALLCOMPONENTS ARE REASSEMBLED.DURING THE TEST DRIVE, DO NOT TRY TOREAD THE DRB SCREEN WHILE IN MOTION.DO NOT HANG THE DRBIII FROM THEREAR VIEW MIRROR OR OPERATE IT
YOURSELF. HAVE AN ASSISTANTAVAILABLE TO OPERATE THE DRBIII.
4.4 DIAGNOSIS
1. Your diagnostic test pr ocedur e must begin with a
th orough visual inspection of the system in ques-
tion for damaged components or disconnected
connectors. For ABS the brake lamps must be
operational prior to continuing.
2. Conn ect the DRBIII to the data link connector,
which is located under the dash to the left of the
steering column. If the DRBIII
does not powerup, check the power an d ground supplies to t he
connector.
3. Turn the ignition on. Select the system in ques-
t i on . I f t h e D RB I II displays No Response
condition you must diagnose that first.
4. Read a nd record a ll diagnostic tr ouble codes. For
ABS if the Battery Voltage Out of Range diag-
n os t ic t r o u b le cod e i s p r e s e n t , i t m u s t b e r e -
paired prior t o addressing an y other DTCs. If
an y additional DTCs a re pr esent, pr oceed to th e
appropriate test by locating the matching test in
the Table of Contents and begin to diagnose the
symptom.
5. For ABS if there are no diagnostic trouble codes
present , identify the customer complaint. Select
Inputs/Outputs and read the brake switch in-
put as you press and release the brake pedal. If
th e display does not ma tch th e stat e of the pedal,
diagnose the symptom. If a problem exists withthe amber ABS warning indicator or the red
Brak e indicator exists, diagnose t he symptom.
Read t he traction control switch input as you
press and release the switch. If the display does
not ma tch th e stat e of the indicator, diagnose the
symptom.
6. If no other problems a re foun d, it will be neces-
s a r y t o r oa d t e s t t h e v eh i cl e. P e r for m s e ve r a l
antilock stops from above 50 Km/h (30 mph) and
t h e n r e p ea t s t e p 4 . I f a n y d ia g n os t ic t r o u b le
cod e s a r e p r e se n t , p r oce ed t o t h e a p p r op r ia t e
test.7. The following conditions should be considered
NORMAL operat ion, a nd no repa irs sh ould be
attempted to correct them.
B r a ke p ed a l fe ed ba ck d u r in g a n AB S s t op
(clicking, vibrat ing).
Clicking, groaning or buzzing at 25 Km/h (15
mph) or 40 Km/h (24 mph) (drive off self test).
Groaning noise during an ABS stop.
S li gh t b r a k e p e d a l d r op a n d p op n oi se w h e n
ignition is initially turned on.
Brake pedal ratcheting down at the end of an
ABS stop.
8. If the complaint is ABS cycling at th e end of a
s t op a t low s pee ds , it m a y b e ca u se d b y a
marginal wheel speed sensor signal. The sensor
a i r g a p, t on e w h e el con d i t ion , a n d /or b r a k e s
ha nging up are possible cau ses of this condition.
9 . A ft e r a r oa d t e s t i n w h ich n o p r o bl em s w er e
found, refer to any Technical Service Bulletins
tha t may a pply.
5 . 0 R EQU I RED T OOL S A N DEQUIPMENT
DRBIII (diagnostic read-out box)
jum per wires
ohmmeter
voltmeter
test light
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6.0 GLOSSARY OF TERMS
AB M an ti-lock bra ke module
AB S antilock brake system
B CM body control module
D C direct current
D LC data link connector
D R B diagnostic read-out box
D TC diagnostic test code
EVBP electr onic var iable bra ke proportion-
in g
HCU hydraulic control unit
I/C integrated circuit
IC U integrated control unit
IP M integrated power module
J B L K junction block
m A milli-AmpP CI programmable communication inter-
face
P /M pump motor
TC S tra ction cont rol system
VS S vehicle speed signal
WSS wheel speed sensor
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NOTES
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7 .0
DIAGNOSTI C I NFORM ATI ON AND
PROCEDURES
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S y m p t o m :
ABM INTERNAL
W h e n M o n i t o r e d a n d S e t C o n d i t i o n :
ABM INTERNAL
When Monitored: Ignition On - Continu ously
Set Condition: When one of two interna l CPUs, fails the progra mmed self test within th e
ABM.
P O S S I B L E C A U S E S
INTERMITTENT DTC
DAMAGED ABM/ABM HARNESS CONNECTOR
FUSED RUN RELAY OUTPUT CIRCUIT OPEN
ABS VALVE FUSED B(+) CIRCUIT OPEN
ABS P UMP FUSED B(+) CIRCUIT OPEN
ABM - GROUND CIRCUIT OPE N
ABM - INTERNAL FAULT
TES T ACTION AP P LICAB ILITY
1 Tu r n t h e ign it ion on .
With the DRBIII, read DTCs.
With the DRBIII, erase DTCs.Turn the ignition off.
Turn the ignition on.
With the DRBIII, read DTCs.
Does the DRBIII display ABM INTERNAL?
All
Yes G o To 2
N o Go To 7
2 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Inspect t he ABM/ABM ha rness connector for dam age.
Is th ere a ny broken, bent, pus hed out, corroded or s pread t erm inals ?
All
Yes
Repair as necessary.Perform ABS VERIFICATION TE ST - VER 1.
N o Go To 3
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TES T ACTION AP P LICAB ILITY
3 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Turn the ignition on.
M eas ure th e voltage of the F u s ed Run Relay O utput circuit.Is the voltage above 10 volts?
All
Yes G o To 4
N o Repair the F us ed Run Relay O utput circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
4 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Measure the voltage of th e ABS Valve Fu sed B(+) circuit.
Is the voltage above 10 volts?
All
Yes G o To 5
N o Repair the ABS Valve Fu sed B(+) circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
5 Tu r n t h e i gn it i on off.
Disconnect the ABM har ness connector.
Measure the voltage of the ABS Pump Fused B(+) circuit.
Is the voltage above 10 volts?
All
Yes G o To 6
N o Repair the ABS Pump Fused B(+) circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
6 Tu r n t h e i gn it i on off.
Disconnect the ABM har ness connector.
Measure the resistance of the ground circuits.
Is the resistance below 5.0 ohms?
All
Yes Replace t he Anti-Lock Bra ke M odule in accordance w ith the
Service Informa tion.
Perform ABS VERIFICATION TE ST - VER 1.
N o Repair the ground circuit(s) for an open.
Perform ABS VERIFICATION TEST - VER 1.
7 Tu r n t h e i gn it i on off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect th e relat ed wire h arn ess connectors. Look for broken, bent, push ed
out, or corroded t ermina ls.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
All
Yes Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
N o Test Complete.
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ABM INTERNAL C o n t i n u e d
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S y m p t o m :
BATTERY VOLTAGE OUT OF RANGE
W h e n M o n i t o r e d a n d S e t C o n d i t i o n :
BATTERY VOLTAGE OUT OF RANGE
When Monitored: Ignition On - Continu ously
Set Condition: When th e ABM detects ba tter y voltage out of specified ran ge on t he ABS
Valve Fused B(+) circuit. Either the voltage is over 17.0 or under 7.5 volts on this circuit.
P O S S I B L E C A U S E S
INTERMITTENT DTC
BATTERY/CHARGING SYSTEM FAILURE
DAMAGED ABM/ABM HARNESS CONNECTOR
ABS VALVE FUSED B(+) CIRCUIT OPEN
GROUND CIRCUIT OPE N
ABM - INTERNAL FAULT
TES T ACTION AP P LICAB ILITY
1 Tu r n t h e ign it ion on .
With the DRBIII, read DTCs.
With the DRBIII, era se DTCs.
Turn the ignition off.
S tart the engine.
With the DRBIII, read DTCs.
Does the DRBIII display BATTERY VOLTAGE OUT OF RANGE?
All
Yes G o To 2
N o Go To 6
2 Tu r n t h e ig ni t ion off.
P erform a bat tery tes t a nd charging s ys tem tes t.
N O TE : R e f e r t o s e r v i c e i n f o r m a t i o n f o r t h e r e l a t e d t e s t ( s )/s y m p t o m ( s ) .
D oes the battery a nd charging s ys tem pas s ?
All
Yes G o To 3
N o
Repair as neccessary.Perform ABS VERIFICATION TEST - VER 1.
3 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Inspect the ABM and ABM harness connector for damage.
Is th ere a ny broken, bent, pus hed out, corroded or s pread t erm inals ?
All
Yes Repair as necessary.
Perform ABS VERIFICATION TE ST - VER 1.
N o Go To 4
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TES T ACTION AP P LICAB ILITY
4 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Measure th e volta ge of the ABS Valve Fu sed B(+) circuit.
Is the voltage above 10 volts?
All
Yes G o To 5
N o Repair the ABS Valve Fused B(+) circuit for an open. If the fuse is
open make sure to check for a short to ground.
Perform ABS VERIFICATION TEST - VER 1.
5 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Measure the resistance of the ground circuits.
Is the resistance below 5.0 ohms?
All
Yes Replace t he Anti-Lock Brake M odule in accordance w ith the
Service Informa tion.
Perform ABS VERIFICATION TE ST - VER 1.
N o Repair the ground circuit(s) for an open.
Perform ABS VERIFICATION TEST - VER 1.
6 Tu r n t h e i gn it i on off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect th e relat ed wire h arn ess connectors. Look for broken, bent, push ed
out, or corroded t ermina ls.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
All
Yes Repair as necessary.
Perform ABS VERIFICATION TE ST - VER 1.
N o Test Complete.
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BATTERY VOLTAGE OUT OF RANGE C o n t i n u e d
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S y m p t o m :
BCM MESSAGES NOT RECEIVED
W h e n M o n i t o r e d a n d S e t C o n d i t i o n :
BCM MESSAGES NOT RECEIVED
When Monitored: Ignition On - Continu ously
Set Condition: When t he ABM detects the BCM is not connected or not functioning
correctly for 10 seconds.
P O S S I B L E C A U S E S
ATTEMPT TO COMMUNICATE WITH THE BCM
BODY CONTROL MODULE
TES T ACTION AP P LICAB ILITY
1 Tu r n t h e ign it ion on .
With the DRBIII, attempt to communicate with the Body Control Module.
Was the DRBIII able to I/D or communicate with the BCM?
All
Yes G o To 2
N o Refer t o the Commu nication category for the related symptom(s).
Perform BODY VERIFICATION TE ST - VER 1.
2 Wit h t he DRBIII, era se DTCs.
Cycle the ignition switch from off to on and wait approximately 1 minute.
With the DRBIII, read DTCs.Did this DTC reset?
All
Yes Replace t he Body Control Module in a ccordance with the service
information.
Perform BODY VERIFICATION TE ST - VER 1.
N o Test Complete.
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S y m p t o m :
INSTRUMENT CLUSTER BULB
W h e n M o n i t o r e d a n d S e t C o n d i t i o n :
INSTRUMENT CLUSTER BULB
When Monitored: Ignition On - Continu ously
Set Condition: When the mechanical instrum ent cluster informs t he ABM that t he ABS,
Bra ke, an d TCS (if equipped) indicat ors failed an d cant be illumina ted.
P O S S I B L E C A U S E S
INSTRUMENT CLUSTER OR ABM DTC PRESE NT
CHECKING INSTRUMENT CLUSTER OPERATION
INSTRUMENT CLUSTER SELF-TEST
INSTRUMENT CLUSTER INTERNAL FAULT
ABM - INTERNAL FAULT
TES T ACTION AP P LICAB ILITY
1 Tu r n t h e ign it ion on .
With the DRBIII, read DTCs.
Are t here an y Ins trum ent Clus ter or ABM D TCs pres ent?
All
Yes Refer to the appropriate category for the related symptom(s).
Perform ABS VERIFICATION TE ST - VER 1.
N o Go To 2
2 Tu r n t h e ig ni t ion off.
Perform the Key-on Bulb Check.
Does the ABS, Brake, or TCS (if equipped) indicators light and then go out after four
seconds?
All
Yes G o To 3
No. Light remains after bulb check.
G o To 4
No. Indicator never came on.
G o To 5
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TES T ACTION AP P LICAB ILITY
3 Tu r n t h e ig ni t ion off.
Turn the ignition on.
With the DRBIII, record and erase DTCs.
N O TE : I f y o u h a v e o t h e r D T C s , r e p a i r o t h e r D T C s f i r s t b e f o r e c o n t i n u i n g .Turn the ignition off.
Remove ABS Valve fuse.
Perform the Key-on Bulb Check.
Does th e ABS, Brake, an d TCS (if equipped) Indicat ors rema in on a fter th e 4 second
bulb check?
All
Yes Reinstall the ABS Valve fuse. With the DRBIII, e r a s e I n s t r u -
ment Cluster DTCs. Test Complete.
Perform ABS VERIFICATION TEST - VER 1.
N o Go To 4
4 Reins tall the ABS Valve fus e, if rem oved.
Turn the ignition off.
Turn the ignition to RU N .P erform the Ins t rum ent Clus ter s elf tes t.
N O TE : R e f e r t o B o d y i n f o r m a t i o n f o r t h e r e l a t e d t e s t ( s ) .
D id t he indicators i l lum inate during the Ins trum ent Clus ter s elf tes t?
All
Yes Replace th e A nti-Lock Brake m odule in accordance w ith the
Service Informa tion.
Perform ABS VERIFICATION TE ST - VER 1.
N o Go To 5
5 Tu r n t h e ig ni t ion off.
Turn the ignition to RU N .
P erform the Ins t rum ent Clus ter s elf tes t.
N O TE : R e f e r t o B o d y i n f o r m a t i o n f o r t h e r e l a t e d t e s t ( s ) .
Do the indicators turn on for 4 seconds, shut off for 5-10 seconds then illuminate?
All
Yes Test Complete.
N o Ensure the ABS indicator bulb is installed or good in the Instru-
ment Cluster. If verified working, replace the Inst rum ent Cluster
in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1.
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I N ST R U ME N T C L U ST E R B U L B C o n t i n u e d
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S y m p t o m L i s t :
LEFT FRONT WHEEL SPEED SENSOR CIRCUIT
REAR WHEEL SPEED SENSOR CIRCUIT
RIGHT FRONT WHEEL SPEED SENSOR CIRCUIT
Te s t N o t e : Al l s y m p t o m s l i s t e d a b o v e a r e d i a g n o s e d u s i n g t h e s a m e te s t s .
T h e t i t l e f o r t h e t e s t s w i l l b e L E F T F R O N T W H E E L S P E E D
SENSOR CIRCUIT.
W h e n M o n i t o r e d a n d S e t C o n d i t i o n :
LEFT FRO NT WH EEL SP EED SENS O R CIRCUIT
When Monitored: Ignition On - Continu ously
Set Condition: When the ABM detects a wheel speed sensor circuit current is out of
range.
REAR WH EEL SP EED SENS O R CIRCUIT
When Monitored: Ignition On - Continu ously
Set Condition: When the ABM detects a wheel speed sensor circuit current is out of
range.
RIGH T FRO NT WH EEL SPEED SENS O R CIRCUIT
When Monitored: Ignition On - Continu ously
Set Condition: When the ABM detects a wheel speed sensor circuit current is out of
range.
P O S S I B L E C A U S E S
INTERMITTENT CONDITION
WHEEL SP EED SENSOR OR CONNECTOR DAMAGE
WHEEL SPEE D SE NSOR SIGNAL CIRCUIT FAULT
WHEEL SPEE D SE NSOR 12 VOLT SUP PLY CIRCUIT SHORT TO GROUND
WHEEL SP EED SENSOR 12 VOLT SUP PLY CIRCUIT OPEN
WHEEL SPEED SENSOR SIGNAL CIRCUIT SHORT TO GROUND
WHEEL SPEED SENSOR SIGNAL CIRCUIT OPEN
ABM - 12 VOLT SUPPLY CIRCUIT FAULT
ABM - SIGNAL CIRCUIT FAULT
WHEEL SP EED SENSOR 12 VOLT SUP PLY SHORT TO GROUND
WHEEL SPEED SENSOR SIGNAL CIRCUIT INOPERATIVE
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TES T ACTION AP P LICAB ILITY
1 Tu r n t h e ign it ion on .
With the DRBIII, read DTCs.
With the DRBIII, read and record F reeze F ram e inform ation.
With the DRBIII
, erase DTCs.Turn the ignition off.
Turn the ignition on.
With the DRBIII, read DTCs.
N O TE:Th e A BM mu s t s en s e all fou r w h eels at 25k m/h (15 mp h ) b efore it w ill
e x t i n g u i s h t h e A B S i n d i c a t o r s .
Does the DRBIII display W H EEL S P EED S EN S O R CIRCU IT?
All
Yes G o To 2
N o G o To 1 3
2 Tu r n t h e ig ni t ion off.
Inspect the ABM connector, affected Wheel Speed Sensor, and affected Wheel Speed
Sensor connector.
Is t he a ffected Wheel Speed Sensor or any of the connector(s) dama ged?
All
Yes Repair as necessary.
Perform ABS VERIFICATION TE ST - VER 1.
N o Go To 3
3 Tu r n t h e ig ni t ion off.
Disconnect the affected Wheel Speed Sensor connector.
N o t e : Ch e c k c o n n e c t o r - C le a n / r e p a i r a s n e c e s s a r y .
Turn the ignition on.
Measure the voltage between affected Wheel Speed Sensor 12 Volt Supply circuit and
ground.
Is the voltage above 10 volts?
All
Yes G o To 6
N o Go To 4
4 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Disconnect the affected Wheel Speed Sensor connector.
Using a 12-volt test light connected to 12-volts, pr obe t he affected Wheel Speed
Sensor 12 Volt Supply circuit.
Does the test light illuminate?
All
Yes Repair the affected Wheel Speed Sensor 12 Volt Supply circuit for
a s hort to ground.
Perform ABS VERIFICATION TE ST - VER 1.
N o Go To 5
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BRAKES (25E)
LEFT FRONT WHEEL SPEED SENSOR CIRCUIT C o n t i n u e d
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TES T ACTION AP P LICAB ILITY
5 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Disconnect the affected Wheel Speed Sensor connector.
Connect a jumper wire between affected Wheel Speed Sensor 12 Volt Supply circuitand ground.
Using a 12-volt test light connected to 12-volts, pr obe t he affected Wheel Speed
Sensor 12 Volt Supply circuit.
Does the test light illuminate?
All
Yes G o To 6
N o Repair the affected Wheel Speed Sensor 12 Volt Supply circuit for
an open.
Perform ABS VERIFICATION TEST - VER 1.
6 Tu r n t h e ig ni t ion off.
Disconnect the affected Wheel Speed Sensor connector.
N O TE : C h e c k c o n n e c t o r - C l e a n / re p a i r a s n e c e s s a r y.
Turn the ignition on.Measure the voltage between a ffected Wheel Speed Sensor Signal circuit a nd ground.
Is the voltage above 1 volt?
All
Yes Repair t he a ffected Wheel Speed Sensor Signa l circuit for a short
to voltage.
Perform ABS VERIFICATION TE ST - VER 1.
N o Go To 7
7 Tu r n t h e i gn it i on off.
Disconnect the ABM har ness connector.
Disconnect the affected Wheel Speed Sensor connector.
Using a 12-volt test light connected to 12-volts, pr obe t he affected Wheel Speed
Sensor Signal circuit.
Does the test light illuminate?
All
Yes Repair t he a ffected Wheel Speed Sensor Signa l circuit for a short
to ground.
Perform ABS VERIFICATION TE ST - VER 1.
N o Go To 8
8 Tu r n t h e i gn it i on off.
Disconnect the ABM har ness connector.
Disconnect the affected Wheel Speed Sensor connector.
Connect a jum per w ire betw een affected W heel S peed S ens or S ignal circuit and
ground.
Using a 12-volt test light connected to 12-volts, pr obe t he affected Wheel Speed
Sensor Signal circuit.
Does the test light illuminate?
All
Yes G o To 9
N o Repair the affected Wheel Speed Sensor Signal circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
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BRAKES (25E)
LEFT FRONT WHEEL SPEED SENSOR CIRCUIT C o n t i n u e d
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TES T ACTION AP P LICAB ILITY
9 Tu r n t h e ig ni t ion off.
Remove the ABM harness strain relief to access wires.
Reconnect the ABM h arn ess connector.
Turn the ignition on.Measure the voltage between affected Wheel Speed Sensor 12 Volt Supply circuit and
ground.
Is the voltage above 10 volts?
All
Yes G o To 1 0
N o Replace t he Anti-Lock Bra ke M odule in accordance w ith the
Service Informa tion.
Perform ABS VERIFICATION TEST - VER 1.
1 0 Tu r n t h e ig ni t ion off.
Remove the ABM harness strain relief to access wires.
Reconnect the ABM h arn ess connector.
Turn the ignition on.
Measure the voltage between affected Wheel Speed Sensor 12 Volt Supply circuit andaffected Wheel Speed Sensor Signal circuit.
Is the voltage above 10 volts?
All
Yes G o To 11
N o Replace t he Anti-Lock Bra ke M odule in accordance w ith the
Service Informa tion.
Perform ABS VERIFICATION TEST - VER 1.
11 Tu r n t h e i gn i t ion off.
Reconnect ALL affected Wheel Speed Sensor circuit connectors.
Disconnect the affected Wheel Speed Sensor connector.
Turn the ignition on.
Measure the voltage of the affected Wheel Speed Sensor 12 Volt Supply circuit in the
affected Wheel Speed Sensor connector while reconnecting the sensor connector.Did the affected Wheel Speed Sensor 12 Volt Supply circuit drop voltage to 0 DC
volts?
All
Yes Replace the affected Wheel Speed Sensor in accordance with the
Service Informa tion.
Perform ABS VERIFICATION TE ST - VER 1.
N o G o To 1 2
1 2 Tu r n t h e i gn it i on off.
Reconnect ALL affected Wheel Speed Sensor circuit connectors.
Turn the ignition on.
M eas ure the D C voltage of the W heel S peed S ens or S ignal circuit in the affected
Wheel Speed Sensor connector.
Slowly rotate the wheel.Does t he DC volta ge toggle bet ween 1.6 volts t o .8 volts?
All
Yes G o To 1 3
N o Replace th e affected Wheel Speed Sensor in accordance with the
Service Informa tion.
Perform ABS VERIFICATION TEST - VER 1.
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BRAKES (25E)
LEFT FRONT WHEEL SPEED SENSOR CIRCUIT C o n t i n u e d
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TES T ACTION AP P LICAB ILITY
1 3 Tu r n t h e ig ni t ion off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect th e r elated wire har ness connectors. Look for broken, bent, pu shedout, or corroded t ermina ls.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were a ny pr oblems found?
All
Yes Repair as necessary.
Perform ABS VERIFICATION TE ST - VER 1.
N o Test Complete.
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BRAKES (25E)
LEFT FRONT WHEEL SPEED SENSOR CIRCUIT C o n t i n u e d
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S y m p t o m L i s t :
L E F T F R O N T WH E E L SP E E D SE N SO R SI GN A L
REAR WHEEL SPEED SENSOR SIGNAL
RIGHT FRONT WHEEL SPEED SENSOR SIGNAL
Te s t N o t e : Al l s y m p t o m s l i s t e d a b o v e a r e d i a g n o s e d u s i n g t h e s a m e te s t s .
T h e t i t l e f o r t h e t e s t s w i l l b e L E F T F R O N T W H E E L S P E E D
SENSOR SIGNAL.
W h e n M o n i t o r e d a n d S e t C o n d i t i o n :
LEFT FRO NT WH EEL SP EED SENS O R SIG NAL
When Monitored: Ignition On - Continu ously
Set Condition: When th e ABM detects t he following on the wheel speed sensor signal
circuit: missing signal, continuously low wheel speed, changes erratically, periodic drop out
of a wheel speed, and too long of pressure reduction during an ABS event.
REAR WH EEL SP EED SENS O R SIG NAL
When Monitored: Ignition On - Continu ously
Set Condition: When th e ABM detects t he following on the wheel speed sensor signal
circuit: missing signal, continuously low wheel speed, changes erratically, periodic drop out
of a wheel speed, and too long of pressure reduction during an ABS event.
RIGH T FRO NT WH EEL SP EED SENS O R SIG NAL
When Monitored: Ignition On - Continu ously
Set Condition: When th e ABM detects t he following on the wheel speed sensor signal
circuit: missing signal, continuously low wheel speed, changes erratically, periodic drop out
of a wheel speed, and too long of pressure reduction during an ABS event.
P O S S I B L E C A U S E S
WHEEL SPEED SENSOR SIGNAL DTC PRESENT
AFFE CTED WHEEL SPEE D SE NSOR SIGNAL INOPE RATIVE
AFFE CTED WHEEL SPEE D SEN SOR CONNECTOR DAMAGEDAFFECTED WHEEL SPEED SENSOR TONE WHEEL DAMAGED
AFFE CTED WHEEL SPEE D SE NSOR AIR GAP FAULT
WHEEL BEARING FAULT
BRAKE LINING FAULT
AFFE CTED WHEEL SPEE D SEN SOR CIRCUIT FAULT
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TES T ACTION AP P LICAB ILITY
1 Tu r n t h e ign it ion on .
With the DRBIII, read DTCs.
With the DRBIII, read and record F reeze F ram e inform ation.
N O TE: Th e A BM mu s t s en s e A LL 4 w h eels at 25 k m/h (15 mp h ) b efore it w ille x t i n g u i s h t h e A B S i n d i c a t o r s .
Does t he DRBIII display W H EEL S P EED S EN S O R S IGN AL and W H EEL S P EED
SENSOR CIRCUIT?
All
Yes Refer t o the a ffected WHEEL SPE ED SE NSOR CIRCUIT for the
related symptom(s).
Perform ABS VERIFICATION TE ST - VER 1.
N o Go To 2
2 Tu r n t h e ign it ion on .
With t he DRBIII in Sensors, monitor ALL the Wheel Speed Sensor Signals while an
assistant drives the vehicle.
Slowly accelerate as straight as possible from a stop to 24 km/h (15 mph).
Is the affected Wheel Speed Signal showing 0 km/h (0 mph)?
All
Yes G o To 3
N o T h e con d it i on i s n ot p r e se n t a t t h i s t i m e. M on i t or D RB I II
param eters w hile w iggling the related w iring harnes s . Refer to
any Technical Ser vice Bulletins(TSB) tha t may apply. Visually
ins pect the related w iring harn es s and connector term inals .
Perform ABS VERIFICATION TEST - VER 1.
3 Tu r n t h e ig ni t ion off.
Inspect the ABM connector, affected Wheel Speed Sensor, and affected Wheel Speed
Sensor connector.
Is the Wheel Speed Sensor or any connector damaged?
All
Yes Repair as necessary.
Perform ABS VERIFICATION TE ST - VER 1.
N o Go To 4
4 Tu r n i gn it i on off.
Inspect t he affected Tone Wheel for dama ged, missing teeth , cracks, or looseness.
N O TE:Th e Ton e Wh eel teeth s h ou ld b e p erfectly s q u are, n ot b en t, or n ick ed .
Is the affected Tone Wheel damaged?
All
Yes Replace t he Tone Wheel in accordance with the Service Informa-
tion.
Perform ABS VERIFICATION TE ST - VER 1.
N o Go To 5
5 Tu r n t h e i gn it i on off.Using a Feeler Gauge, measure the affected Wheel Speed Sensor Air Gap.
N OT E: R e fe r t o t h e a p p r o pr i a te s e r v i c e i n f or m a t io n , i f n e c e s s a r y, f o r
p r o c e d u r e s o r s p e c i f i c a t i o n s .
Is t he Air Gap within specificat ions?
All
Yes G o To 6
N o Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
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BRAKES (25E)
L E F T F R O N T WH E E L SP E E D SE N SO R SI GN A L C o n t i n u e d
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TES T ACTION AP P LICAB ILITY
6 Tu r n t h e ig ni t ion off.
Inspect the wheel bearings for excessive runout or clearance.
N OT E: R e fe r t o t h e a p p r o pr i a te s e r v i c e i n f or m a t io n , i f n e c e s s a r y, f o r
p r o c e d u r e s o r s p e c i f i c a t i o n s .Is the wheel bearing clearance within specifications?
All
Yes G o To 7
N o Repair as necessary.
Perform ABS VERIFICATION TEST - VER 1.
7 Tu r n t h e ig ni t ion off.
Visually inspect bra kes for locking up du e t o lining conta minat ion or overhea ting.
Ins pect all com ponents for defects w hich m ay caus e a W H EEL S P EED S EN S O R
SIGNAL DTC t o set.
Is any component damaged?
All
Yes Repair as necessary.
Perform ABS VERIFICATION TE ST - VER 1.
N o Refer to s ym ptom W H EEL S P EED S EN S O R CIRCU IT for fur-
ther diagnostics.
Perform ABS VERIFICATION TEST - VER 1.
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BRAKES (25E)
L E F T F R O N T WH E E L SP E E D SE N SO R SI GN A L C o n t i n u e d
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S y m p t o m L i s t :
LONGITUDINAL ACCELERATION SENSOR CIRCUIT
LONGITUDINAL ACCELERATION SENSOR SIGNAL
Te s t N o t e : Al l s y m p t o m s l i s t e d a b o v e a r e d i a g n o s e d u s i n g t h e s a m e te s t s .T he t i t l e f o r t he t e s t s w i l l be L O N G I T U D I N A L A C C E L E R A -
TION SENSOR CIRCUIT.
W h e n M o n i t o r e d a n d S e t C o n d i t i o n :
LONGITUDINAL ACCELERATION SENSOR CIRCUIT
When M onitored: Ignition ON. Continuously m onitored when speed is greater than 2
km /h (1 m ph) an d t here is n o Brake Lam p Switch input.
Set Condition: When the CAB detects a condition outside programm ed para meters from
the internal Longitudinal Acceleration sensor.
LONGITUDINAL ACCELERATION SEN SOR SIGNAL
When M onitored: Ignition ON. Continuously m onitored when speed is greater than 2
km /h (1 m ph) an d t here is n o Brake Lam p Switch input.
Set Condition: When the CAB detects a condition outside programm ed para meters from
the internal Longitudinal Acceleration sensor.
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S y m p t o m :
MIC MESSAGES NOT RECEIVED
W h e n M o n i t o r e d a n d S e t C o n d i t i o n :
MIC MESSAGES NOT RECEIVED
When Monitored: Ignition On - Continu ously
Set Condition: When the ABM detects the M IC is not connected or not functioning
correctly for 10 seconds.
P O S S I B L E C A U S E S
CHECK FOR DTCS
VERIFY DTC
ATTEMPT TO COMMUNICATE WITH THE MIC
MODULE
TES T ACTION AP P LICAB ILITY
1 Tu r n t h e ign it ion on .
With the DRBIII, rea d BCM DTCs.
Are a ny Cluster Wakeup Outpu t DTCs set?
All
Yes Refer to symptom list for problems related to the cluster wakeup
circuit.
Perform BODY VERIFICATION TE ST - VER 1.
N o Go To 2
2 Tu r n t h e ign it ion on .
With the DRBIII, era se DTCs.
With the DRBIII, read DTCs.
Did this DTC reset?
All
Yes G o To 3
N o The condition that caused this DTC is currently not present. Use
the wiring diagram s/schema tic as a guide, and inspect t he relat ed
wiring harness for a possible intermittent.
Perform BODY VERIFICATION TE ST - VER 1.
3 Tu r n t h e ign it ion on .
With the DRBIII, att em pt t o com m unicate w ith t he Ins t rum ent Clus ter (M IC).
Was the DRBIII able to I/D or communicate with the Instrument Cluster (MIC)?
All
Yes G o To 4
N o Refer t o the Commu nication category for the related symptom(s).
Perform BODY VERIFICATION TE ST - VER 1.
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TES T ACTION AP P LICAB ILITY
4 Wit h t he DRBIII, era se DTCs.
Cycle the ignition switch from off to on and wait approximately 1 minute.
With the DRBIII, read DTCs.
Did this DTC reset?
All
Yes Replace the m odule w hich s et the D TC in accordance w ith the
service information.
Perform BODY VERIFICATION TE ST - VER 1.
N o Test Complete.
27
BRAKES (25E)
MIC MESSAGES NOT RECEIVED C o n t i n u e d
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S y m p t o m :
PCI BUS COMMUNICATION
W h e n M o n i t o r e d a n d S e t C o n d i t i o n :
PCI BUS COMMUNICATION
When Monitored: Ignition On - Continu ously
Set Condition: When th e ABM detects P CI Bus n ot connected or is shorted to voltage or
ground.
P O S S I B L E C A U S E S
INTERMITTENT DTC
DAMAGED ABM/ABM HARNESS CONNECTOR
FUSED RUN RELAY OUTPUT CIRCUIT OPEN
ABS VALVE FUSED B(+) CIRCUIT OPEN
ABM - GROUND CIRCUIT OPE N
PCI BUS CIRCUIT OPEN
ABM - INTERNAL FAULT
PCI BUS CIRCUIT SHORT TO VOLTAGE
PCI BUS CIRCUIT SHORT TO GROUND
TES T ACTION AP P LICAB ILITY1 Tu r n t h e ign it ion on .
With the DRBIII, read DTCs.
With the DRBIII, erase DTCs.
Turn the ignition off.
Turn the ignition on.
With the DRBIII, read DTCs.
Does the DRBIII display PCI BUS COMMUNICATION?
All
Yes G o To 2
N o Go To 9
2 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Inspect t he ABM/ABM ha rness connector for dam age.
Is th ere a ny broken, bent, pus hed out, corroded or s pread t erm inals ?
All
Yes Repair as necessary.
Perform ABS VERIFICATION TE ST - VER 1.
N o Go To 3
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TES T ACTION AP P LICAB ILITY
3 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Turn the ignition on.
M eas ure th e voltage of the F u s ed Run Relay O utput circuit.Is the voltage above 10 volts?
All
Yes G o To 4
N o Repair the F us ed Run Relay O utput circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
4 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Measure the voltage of th e ABS Valve Fu sed B(+) circuit.
Is the voltage above 10 volts?
All
Yes G o To 5
N o Repair the ABS Valve Fu sed B(+) circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
5 Tu r n t h e i gn it i on off.
Disconnect the ABM har ness connector.
Measure the resistance of the ground circuits.
Is the resistance below 5.0 ohms?
All
Yes G o To 6
N o Repair the ground circuit(s) for an open.
Perform ABS VERIFICATION TEST - VER 1.
6 Tu r n t h e i gn it i on off.
Disconnect the ABM har ness connector.
Turn the ignition on.
Measure the voltage of the PCI Bus circuit.Is there any voltage pres ent?
All
Yes Repair the PCI Bus circuit for a short to voltage.
Perform ABS VERIFICATION TE ST - VER 1.
N o G o To 7
7 Tu r n t h e i gn it i on off.
Disconnect the ABM har ness connector.
M eas ure the res istance betw een ground and the P CI Bus circuit.
Is the resistance below 5.0 ohms?
All
Yes Repair the PCI Bus circuit for a short to ground.
Perform ABS VERIFICATION TEST - VER 1.
N o G o To 8
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BRAKES (25E)
PCI BUS COMMUNICATION C o n t i n u e d
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TES T ACTION AP P LICAB ILITY
8 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Measure the resistance of the PCI Bus circuit between the ABM harness connector
and the Data Link connector.Is the resistance over 5.0 ohms?
All
Yes Repair the PCI Bus circuit for an open.
Perform ABS VERIFICATION TE ST - VER 1.
N o Replace t he Anti-Lock Bra ke M odule in accordance w ith the
Service Informa tion.
Perform ABS VERIFICATION TEST - VER 1.
9 Tu r n t h e i gn it i on off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect th e relat ed wire h arn ess connectors. Look for broken, bent, push ed
out, or corroded t ermina ls.
Refer to any Hotline letters or Technical Service Bulletins that may apply.Were a ny pr oblems found?
All
Yes Repair as necessary.
Perform ABS VERIFICATION TE ST - VER 1.
N o Test Complete.
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BRAKES (25E)
PCI BUS COMMUNICATION C o n t i n u e d
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S y m p t o m :
P C I B U S L OO P B A CK
W h e n M o n i t o r e d a n d S e t C o n d i t i o n :
PCI BUS LOO PBACK
When Monitored: Ignition On - Continu ously
Set Condition: When th e ABM detects PCI Bus messa ges ha ve been missing for 5 seconds
and has failed th e self test .
P O S S I B L E C A U S E S
INTERMITTENT DTC
DAMAGED ABM/ABM HARNESS CONNECTOR
FUSED RUN RELAY OUTPUT CIRCUIT OPEN
ABS VALVE FUSED B(+) CIRCUIT OPEN
ABM - GROUND CIRCUIT OPE N
ABM - INTERNAL FAULT
TES T ACTION AP P LICAB ILITY
1 Tu r n t h e ign it ion on .
With the DRBIII, read DTCs.
With the DRBIII, erase DTCs.
Turn the ignition off.
Turn the ignition on.
With the DRBIII, read DTCs.
Does the DRBIII display PCI BUS LOOPBACK?
All
Yes G o To 2
N o Go To 6
2 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Inspect t he ABM/ABM ha rness connector for dam age.
Is th ere a ny broken, bent, pus hed out, corroded or s pread t erm inals ?
All
Yes Repair as necessary.
Perform ABS VERIFICATION TE ST - VER 1.
N o Go To 3
3 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Turn the ignition on.
M eas ure th e voltage of the F u s ed Run Relay O utput circuit.
Is the voltage above 10 volts?
All
Yes G o To 4
N o Repair the F us ed Run Relay O utput circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
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TES T ACTION AP P LICAB ILITY
4 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Measure th e volta ge of the ABS Valve Fu sed B(+) circuit.
Is the voltage above 10 volts?
All
Yes G o To 5
N o Repair the ABS Valve Fu sed B(+) circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
5 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Measure the resistance of the ground circuits.
Is the resistance below 5.0 ohms?
All
Yes Replace t he Anti-Lock Brake M odule in accordance w ith the
Service Informa tion.
Perform ABS VERIFICATION TE ST - VER 1.
N o Repair the ground circuit(s) for an open.Perform ABS VERIFICATION TEST - VER 1.
6 Tu r n t h e i gn it i on off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect th e relat ed wire h arn ess connectors. Look for broken, bent, push ed
out, or corroded t ermina ls.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
All
Yes Repair as necessary.
Perform ABS VERIFICATION TE ST - VER 1.
N o Test Complete.
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PCI BUS LOOPBACK C o n t i n u e d
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S y m p t o m :
P C I B U S SH O R TE D T O GR O U N D
W h e n M o n i t o r e d a n d S e t C o n d i t i o n :
PCI BUS SH O RTED TO G RO UND
When Monitored: Ignition On - Continu ously
Set Condition: When the ABM detects P CI Bus is shorted to ground for m ore t han 10
seconds.
P O S S I B L E C A U S E S
INTERMITTENT DTC
DAMAGED ABM/ABM HARNESS CONNECTOR
FUSED RUN RELAY OUTPUT CIRCUIT OPEN
ABS VALVE FUSED B(+) CIRCUIT OPEN
ABM - GROUND CIRCUIT OPE N
PCI BUS CIRCUIT OPEN
ABM - INTERNAL FAULT
PCI BUS CIRCUIT SHORT TO VOLTAGE
PCI BUS CIRCUIT SHORT TO GROUND
TES T ACTION AP P LICAB ILITY1 Tu r n t h e ign it ion on .
With the DRBIII, read DTCs.
With the DRBIII, erase DTCs.
Turn the ignition off.
Turn the ignition on.
With the DRBIII, read DTCs.
Does the DRBIII display PCI BUS SHORTED TO GROUND?
All
Yes G o To 2
N o Go To 9
2 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Inspect t he ABM/ABM ha rness connector for dam age.
Is th ere a ny broken, bent, pus hed out, corroded or s pread t erm inals ?
All
Yes Repair as necessary.
Perform ABS VERIFICATION TE ST - VER 1.
N o Go To 3
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TES T ACTION AP P LICAB ILITY
3 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Turn the ignition on.
M eas ure th e voltage of the F u s ed Run Relay O utput circuit.Is the voltage above 10 volts?
All
Yes G o To 4
N o Repair the F us ed Run Relay O utput circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
4 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Measure the voltage of th e ABS Valve Fu sed B(+) circuit.
Is the voltage above 10 volts?
All
Yes G o To 5
N o Repair the ABS Valve Fu sed B(+) circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
5 Tu r n t h e i gn it i on off.
Disconnect the ABM har ness connector.
Measure the resistance of the ground circuits.
Is the resistance below 5.0 ohms?
All
Yes G o To 6
N o Repair the ground circuit(s) for an open.
Perform ABS VERIFICATION TEST - VER 1.
6 Tu r n t h e i gn it i on off.
Disconnect the ABM har ness connector.
Turn the ignition on.
Measure the voltage of the PCI Bus circuit.Is there any voltage pres ent?
All
Yes Repair the PCI Bus circuit for a short to voltage.
Perform ABS VERIFICATION TE ST - VER 1.
N o G o To 7
7 Tu r n t h e i gn it i on off.
Disconnect the ABM har ness connector.
M eas ure the res istance betw een ground and the P CI Bus circuit.
Is the resistance below 5.0 ohms?
All
Yes Repair the PCI Bus circuit for a short to ground.
Perform ABS VERIFICATION TEST - VER 1.
N o G o To 8
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BRAKES (25E)
P C I B U S SH O R TE D T O G R OU N D C o n t i n u e d
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TES T ACTION AP P LICAB ILITY
8 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Measure the resistance of the PCI Bus circuit between the ABM harness connector
and the Data Link connector.Is the resistance over 5.0 ohms?
All
Yes Repair the PCI Bus circuit for an open.
Perform ABS VERIFICATION TE ST - VER 1.
N o Replace t he Anti-Lock Bra ke M odule in accordance w ith the
Service Informa tion.
Perform ABS VERIFICATION TEST - VER 1.
9 Tu r n t h e i gn it i on off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect th e relat ed wire h arn ess connectors. Look for broken, bent, push ed
out, or corroded t ermina ls.
Refer to any Hotline letters or Technical Service Bulletins that may apply.Were a ny pr oblems found?
All
Yes Repair as necessary.
Perform ABS VERIFICATION TE ST - VER 1.
N o Test Complete.
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P C I B U S SH O R TE D T O G R OU N D C o n t i n u e d
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S y m p t o m :
PCI BUS SHORTED TO VOLTAGE
W h e n M o n i t o r e d a n d S e t C o n d i t i o n :
PCI BUS SHORTED TO VOLTAGE
When Monitored: Ignition On - Continu ously
Set Condition: When the ABM detects PCI Bus is shorted to voltage for m ore t han 10
seconds.
P O S S I B L E C A U S E S
INTERMITTENT DTC
DAMAGED ABM/ABM HARNESS CONNECTOR
FUSED RUN RELAY OUTPUT CIRCUIT OPEN
ABS VALVE FUSED B(+) CIRCUIT OPEN
ABM - GROUND CIRCUIT OPE N
PCI BUS CIRCUIT OPEN
ABM - INTERNAL FAULT
PCI BUS CIRCUIT SHORT TO VOLTAGE
PCI BUS CIRCUIT SHORT TO GROUND
TES T ACTION AP P LICAB ILITY1 Tu r n t h e ign it ion on .
With the DRBIII, read DTCs.
With the DRBIII, erase DTCs.
Turn the ignition off.
Turn the ignition on.
With the DRBIII, read DTCs.
Does the DRBIII display PCI BUS SHORTED TO VOLTAGE?
All
Yes G o To 2
N o Go To 9
2 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Inspect t he ABM/ABM ha rness connector for dam age.
Is th ere a ny broken, bent, pus hed out, corroded or s pread t erm inals ?
All
Yes Repair as necessary.
Perform ABS VERIFICATION TE ST - VER 1.
N o Go To 3
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TES T ACTION AP P LICAB ILITY
3 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Turn the ignition on.
M eas ure th e voltage of the F u s ed Run Relay O utput circuit.Is the voltage above 10 volts?
All
Yes G o To 4
N o Repair the F us ed Run Relay O utput circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
4 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Measure the voltage of th e ABS Valve Fu sed B(+) circuit.
Is the voltage above 10 volts?
All
Yes G o To 5
N o Repair the ABS Valve Fu sed B(+) circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
5 Tu r n t h e i gn it i on off.
Disconnect the ABM har ness connector.
Measure the resistance of the ground circuits.
Is the resistance below 5.0 ohms?
All
Yes G o To 6
N o Repair the ground circuit(s) for an open.
Perform ABS VERIFICATION TEST - VER 1.
6 Tu r n t h e i gn it i on off.
Disconnect the ABM har ness connector.
Turn the ignition on.
Measure the voltage of the PCI Bus circuit.Is there any voltage pres ent?
All
Yes Repair the PCI Bus circuit for a short to voltage.
Perform ABS VERIFICATION TE ST - VER 1.
N o G o To 7
7 Tu r n t h e i gn it i on off.
Disconnect the ABM har ness connector.
M eas ure the res istance betw een ground and the P CI Bus circuit.
Is the resistance below 5.0 ohms?
All
Yes Repair the PCI Bus circuit for a short to ground.
Perform ABS VERIFICATION TEST - VER 1.
N o G o To 8
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BRAKES (25E)
PCI BUS SHORTED TO VOLTAGE C o n t i n u e d
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TES T ACTION AP P LICAB ILITY
8 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Measure the resistance of the PCI Bus circuit between the ABM harness connector
and the Data Link connector.Is the resistance over 5.0 ohms?
All
Yes Repair the PCI Bus circuit for an open.
Perform ABS VERIFICATION TE ST - VER 1.
N o Replace t he Anti-Lock Bra ke M odule in accordance w ith the
Service Informa tion.
Perform ABS VERIFICATION TEST - VER 1.
9 Tu r n t h e i gn it i on off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect th e relat ed wire h arn ess connectors. Look for broken, bent, push ed
out, or corroded t ermina ls.
Refer to any Hotline letters or Technical Service Bulletins that may apply.Were a ny pr oblems found?
All
Yes Repair as necessary.
Perform ABS VERIFICATION TE ST - VER 1.
N o Test Complete.
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PCI BUS SHORTED TO VOLTAGE C o n t i n u e d
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S y m p t o m :
PCI HARDWARE
W h e n M o n i t o r e d a n d S e t C o n d i t i o n :
PCI HARDWARE
When Monitored: Ignition On - Continu ously
Set Condition: When the ABM detects an init i lization or configuration failure that
doesnt m atch th e progra mmed par ameter s.
P O S S I B L E C A U S E S
INTERMITTENT DTC
DAMAGED ABM/ABM HARNESS CONNECTOR
FUSED RUN RELAY OUTPUT CIRCUIT OPEN
ABS VALVE FUSED B(+) CIRCUIT OPEN
ABM - GROUND CIRCUIT OPE N
ABM - INTERNAL FAULT
TES T ACTION AP P LICAB ILITY
1 Tu r n t h e ign it ion on .
With the DRBIII, read DTCs.
With the DRBIII, erase DTCs.
Turn the ignition off.
Turn the ignition on.
With the DRBIII, read DTCs.
Does the DRBIII display PCI HARDWARE?
All
Yes G o To 2
N o Go To 6
2 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Inspect t he ABM/ABM ha rness connector for dam age.
Is th ere a ny broken, bent, pus hed out, corroded or s pread t erm inals ?
All
Yes Repair as necessary.
Perform ABS VERIFICATION TE ST - VER 1.
N o Go To 3
3 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Turn the ignition on.
M eas ure th e voltage of the F u s ed Run Relay O utput circuit.
Is the voltage above 10 volts?
All
Yes G o To 4
N o Repair the F us ed Run Relay O utput circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
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TES T ACTION AP P LICAB ILITY
4 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Measure th e volta ge of the ABS Valve Fu sed B(+) circuit.
Is the voltage above 10 volts?
All
Yes G o To 5
N o Repair the ABS Valve Fu sed B(+) circuit for an open.
Perform ABS VERIFICATION TEST - VER 1.
5 Tu r n t h e ig ni t ion off.
Disconnect the ABM har ness connector.
Measure the resistance of the ground circuits.
Is the resistance below 5.0 ohms?
All
Yes Replace t he Anti-Lock Brake M odule in accordance w ith the
Service Informa tion.
Perform ABS VERIFICATION TE ST - VER 1.
N o Repair the ground circuit(s) for an open.Perform ABS VERIFICATION TEST - VER 1.
6 Tu r n t h e i gn it i on off.
Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or
partially broken wires.
Visually inspect th e relat ed wire h arn ess connectors. Look for broken, bent, push ed
out, or corroded t ermina ls.
Refer to any Hotline letters or Technical Service Bulletins that may apply.
Were any problems found?
All
Yes Repair as necessary.
Perform ABS VERIFICATION TE ST - VER 1.
N o Test Complete.
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PCI HARDWARE C o n t i n u e d
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S y m p t o m :
PCM MESSAGES N OT RECEIVED
W h e n M o n i t o r e d a n d S e t C o n d i t i o n :
PCM MESSAGES NOT RECEIVED
When Monitored: Ignition On - Continu ously
Set Condition: When the ABM detects the PCM is not connected or not functioning
correctly for 10 seconds.
P O S S I B L E C A U S E S
PCM MESSAGES NOT RECEIVED
ATTEMPT TO COMMUNICATE WITH THE PCM
PCI BUS CIRCUIT OPEN
POWERTRAIN CONTROL MODULE
TES T ACTION AP P LICAB ILITY
1 Tu r n t h e ign it ion on .
With the DRBIII, enter Instrument Cluster, System Tests then PCM Monitor.
Does the DRBIII display: PCM is active on BUS?
All
Yes Eras e the D TC, if DTC res ets , m eas ure th e res is tance of the P CI
Bus circuit bet ween th e PCM conn ector and t he ABM conn ector. If
open, repair as necessary.
Perform BODY VERIFICATION TE ST - VER 1.
N o Go To 2
2 Tu r n t h e ign it ion on .
With the DRBIII, attem pt to com m unicate w ith th e P CM .
Was the DRBIII able to com m unicate w ith the P CM ?
All
Yes G o To 3
N o Refer t o the commu nication category and per form t he a ppropriate
symptom.
Perform BODY VERIFICATION TE ST - VER 1.
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TES T ACTION AP P LICAB ILITY
3 Tu r n t h e ig ni t ion off.
Disconnect the PCM h arn ess connector.
CAUTION: DO NOT PR OBE THE PCM HARNES S CONNECTORS. P ROBING
TH E P C M H A R N ES S C O N N EC TO R S WI LL D A MA GE TH