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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.


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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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.



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.


5 Tu r n t h e i gn it i on off.


Measure the voltage of the ABS Pump Fused B(+) circuit.


All

Yes G o To 6

N o Repair the ABS Pump Fused B(+) circuit for an open.




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.



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.


N o Test Complete.

11

BRAKES (25E)

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


BATTERY VOLTAGE OUT OF RANGE


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.


INTERMITTENT DTC

BATTERY/CHARGING SYSTEM FAILURE



GROUND CIRCUIT OPE N





With the DRBIII, era se DTCs.

Turn the ignition off.

S tart the engine.


Does the DRBIII display BATTERY VOLTAGE OUT OF RANGE?

All

Yes G o To 2

N o Go To 6


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.



Inspect the ABM and ABM harness connector for damage.


All



N o Go To 4

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Measure th e volta ge of the ABS Valve Fu sed B(+) circuit.


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.






All

Yes Replace t he Anti-Lock Brake M odule in accordance w ith the












All



N o Test Complete.

13

BRAKES (25E)

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


BCM MESSAGES NOT RECEIVED


Set Condition: When t he ABM detects the BCM is not connected or not functioning

correctly for 10 seconds.


ATTEMPT TO COMMUNICATE WITH THE BCM

BODY CONTROL MODULE



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.


N o Test Complete.

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S y m p t o m :

INSTRUMENT CLUSTER BULB


INSTRUMENT CLUSTER BULB


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.


INSTRUMENT CLUSTER OR ABM DTC PRESE NT

CHECKING INSTRUMENT CLUSTER OPERATION

INSTRUMENT CLUSTER SELF-TEST

INSTRUMENT CLUSTER INTERNAL FAULT





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).


N o Go To 2


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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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.


N o Go To 4

4 Reins tall the ABS Valve fus e, if rem oved.


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



N o Go To 5


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.


16

BRAKES (25E)

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.


LEFT FRO NT WH EEL SP EED SENS O R CIRCUIT


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



range.

RIGH T FRO NT WH EEL SPEED SENS O R CIRCUIT



range.


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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With the DRBIII, read and record F reeze F ram e inform ation.

With the DRBIII

, erase DTCs.Turn the ignition off.



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


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



N o Go To 3


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 .


Measure the voltage between affected Wheel Speed Sensor 12 Volt Supply circuit and

ground.


All

Yes G o To 6

N o Go To 4




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.


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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Connect a jumper wire between affected Wheel Speed Sensor 12 Volt Supply circuitand ground.


Sensor 12 Volt Supply circuit.


All

Yes G o To 6

N o Repair the affected Wheel Speed Sensor 12 Volt Supply circuit for

an open.




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.


N o Go To 7





Sensor Signal circuit.


All

Yes Repair t he a ffected Wheel Speed Sensor Signa l circuit for a short

to ground.


N o Go To 8




Connect a jum per w ire betw een affected W heel S peed S ens or S ignal circuit and

ground.


Sensor Signal circuit.


All

Yes G o To 9

N o Repair the affected Wheel Speed Sensor Signal circuit for an open.


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BRAKES (25E)


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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.


All

Yes G o To 1 0

N o Replace t he Anti-Lock Bra ke M odule in accordance w ith the



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.


Measure the voltage between affected Wheel Speed Sensor 12 Volt Supply circuit andaffected Wheel Speed Sensor Signal circuit.


All

Yes G o To 11




11 Tu r n t h e i gn i t ion off.

Reconnect ALL affected Wheel Speed Sensor circuit connectors.



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



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.


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



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1 3 Tu r n t h e ig ni t ion off.



Visually inspect th e r elated wire har ness connectors. Look for broken, bent, pu shedout, or corroded t ermina ls.


Were a ny pr oblems found?

All



N o Test Complete.

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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.


LEFT FRO NT WH EEL SP EED SENS O R SIG NAL


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





RIGH T FRO NT WH EEL SP EED SENS O R SIG NAL






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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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).


N o Go To 2


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 .



Inspect the ABM connector, affected Wheel Speed Sensor, and affected Wheel Speed

Sensor connector.

Is the Wheel Speed Sensor or any connector damaged?

All



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.


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.


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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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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.



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



N o Refer to s ym ptom W H EEL S P EED S EN S O R CIRCU IT for fur-

ther diagnostics.


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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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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.


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


MIC MESSAGES NOT RECEIVED


Set Condition: When the ABM detects the M IC is not connected or not functioning



CHECK FOR DTCS

VERIFY DTC

ATTEMPT TO COMMUNICATE WITH THE MIC

MODULE



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.


N o Go To 2


With the DRBIII, era se 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.



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).


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4 Wit h t he DRBIII, era se DTCs.

Cycle the ignition switch from off to on and wait approximately 1 minute.


Did this DTC reset?

All

Yes Replace the m odule w hich s et the D TC in accordance w ith the

service information.


N o Test Complete.

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S y m p t o m :

PCI BUS COMMUNICATION


PCI BUS COMMUNICATION


Set Condition: When th e ABM detects P CI Bus n ot connected or is shorted to voltage or

ground.


INTERMITTENT DTC





PCI BUS CIRCUIT OPEN


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, erase DTCs.




Does the DRBIII display PCI BUS COMMUNICATION?

All

Yes G o To 2

N o Go To 9





All



N o Go To 3

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All

Yes G o To 4







All

Yes G o To 5







All

Yes G o To 6






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.


N o G o To 7



M eas ure the res istance betw een ground and the P CI Bus circuit.


All

Yes Repair the PCI Bus circuit for a short to ground.


N o G o To 8

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PCI BUS COMMUNICATION C o n t i n u e d

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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.










Refer to any Hotline letters or Technical Service Bulletins that may apply.Were a ny pr oblems found?

All



N o Test Complete.

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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


PCI BUS LOO PBACK


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 .


INTERMITTENT DTC













Does the DRBIII display PCI BUS LOOPBACK?

All

Yes G o To 2

N o Go To 6





All



N o Go To 3




M eas ure th e voltage of the F u s ed Run Relay O utput circuit.


All

Yes G o To 4



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All

Yes G o To 5







All




N o Repair the ground circuit(s) for an open.Perform ABS VERIFICATION TEST - VER 1.








All



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


PCI BUS SH O RTED TO G RO UND


Set Condition: When the ABM detects P CI Bus is shorted to ground for m ore t han 10

seconds.


INTERMITTENT DTC















Does the DRBIII display PCI BUS SHORTED TO GROUND?

All

Yes G o To 2

N o Go To 9





All



N o Go To 3

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All

Yes G o To 4







All

Yes G o To 5







All

Yes G o To 6







All



N o G o To 7





All



N o G o To 8

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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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All












All



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


PCI BUS SHORTED TO VOLTAGE


Set Condition: When the ABM detects PCI Bus is shorted to voltage for m ore t han 10

seconds.


INTERMITTENT DTC















Does the DRBIII display PCI BUS SHORTED TO VOLTAGE?

All

Yes G o To 2

N o Go To 9





All



N o Go To 3

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All

Yes G o To 4







All

Yes G o To 5







All

Yes G o To 6







All



N o G o To 7





All



N o G o To 8

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PCI BUS SHORTED TO VOLTAGE C o n t i n u e d

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All












All



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


PCI HARDWARE


Set Condition: When the ABM detects an init i lization or configuration failure that

doesnt m atch th e progra mmed par ameter s.


INTERMITTENT DTC













Does the DRBIII display PCI HARDWARE?

All

Yes G o To 2

N o Go To 6





All



N o Go To 3




M eas ure th e voltage of the F u s ed Run Relay O utput circuit.


All

Yes G o To 4



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All

Yes G o To 5







All




N o Repair the ground circuit(s) for an open.Perform ABS VERIFICATION TEST - VER 1.








All



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


PCM MESSAGES NOT RECEIVED


Set Condition: When the ABM detects the PCM is not connected or not functioning



PCM MESSAGES NOT RECEIVED

ATTEMPT TO COMMUNICATE WITH THE PCM


POWERTRAIN CONTROL MODULE



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.


N o Go To 2


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.


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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

2005 Kj Chassis

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