códigos de falla abs

MeritorWABCO

PneumaticAntilockBrakingSystem

(ABS)

42.00

WABCOE-VersionABSTroubleshooting

GeneralInform

ation

This

subjectcontainsinform

ationfordiagnosingprob-

lemsin

theWABCO

E-VersionpneumaticABSsystem

inthefollowingsections:

TroubleshootingTables

ComponentSpecificTests

ABS/ATC

CircuitPin

WireNumbers

UsingMeritorTOOLBOXsoftware

toreconfigure

theECU

NOTE:Use

Meritor

TOOLBOX

or

ServiceLink

for

thepreferred

method

ofJ1587

faultcode

diagnosis.

MeritorWABCO

also

provides

technicalassistance

through

its

website

and

the

ArvinMeritorCustomer

ServiceCenterphone:1-800-535-5560.

NOTE:Forwiring,seemodule

330BOM

inPartsPro

forthecorrectschematicspecificto

thevehicle

being

serviced.

TroubleshootingTables

Usethe

following

tablesto

troubleshoottheABS

by

MID

-SID.

J1587FaultCodeCross-Reference

MID-SID

Description

Troubleshooting

Table

WheelSensor

136-001

136-002

136-003

136-004

LeftFront

RightFront

LeftRear

RightRear

Table2

Table3

Table4

Table5

J1587FaultCodeCross-Reference

MID-SID

Description

Troubleshooting

Table

ModulatorValve

136-007

136-008

136-009

136-010

LeftFront

RightFront

LeftRear

RightRear

Table6

Table7

Table8

Table9

136-014

136-015

GroundFaults

Table10

Table11

136-018

ATC

Valve(ifequipped)

Table12

136-019

Auxiliary

Output

Table13

136-231

J1939Datalink

Table14

136-251

Voltage

Table15

136-253

ConfigurationErrors

Table16

136-254

MiscellaneousFaults

Table17

Table1,J1587FaultCodeCrossReference

LeftFrontWheelSensorTroubleshooting(SID

001)

MID

SID

FMI

Problem

Test

TestResult

Action

Voltageis

0.2

VAC

orgreater

Sensoradjustm

entsolvedthe

problem.

136

001

01

Incorrectsensor

airgap

1.Adjustthesensor.

ChecktheAC

voltage

acrosspins7and8ofthe

X2(black)ECU

connector

while

rotatingtheLFwheel

30rpm.

Voltageis

lessthan

0.2

VAC

Checkforexcessivewheel

bearingendplayandhubrunout.

Repairasneeded.

Saf-T-LinerC2SchoolBusWorkshopManual,Supplement0,Ju

ly2004

300/1

42.00

MeritorWABCO


(ABS)



001)

MID

SID

FMI

Problem

Test

TestResult

Action

136

001

02

Incorrecttire

size

Checkforcorrecttire

sizeand

mixedtire

sizes.Checkforcorrect

numberofteeth

ontonewheel.

Correctasneeded.

Measurable

voltage

atanypin

Iftheshortis

inthevehicle

harness,repairthewiring.

Ifproblem

isin

thesensor

harness,replacethesensor.

136

001

03

Sensorshortedto

power

2.Measure

thevoltage

acrosspins7oftheX2

(black)connectoranda

goodchassis

ground.

Repeatthetestbetween

pin

8andground.

Novoltageatany

pin

Repeatthetestandcheckfor

interm

ittentshortto

powerin

circuits377LFand377LF+.

Iftheproblem

persists,suspect

thattheECU

isfaulty.

Resistance

betweeneitherpin

andgroundis

less

than100,000ohms

Iftheshortis

inthevehicle


Ifproblem

isin

thesensor


136

001

04

Shortto

ground

3.Measure

theresistance

betweenpin

7oftheX2


goodchassis

ground.


pin

8andground.

Resistance

betweeneitherpin

andgroundis

greaterthan

100,000ohms

Repeatthetestforinterm

ittent

shortto

groundin

circuits377LF

and377LF+.

Iftheproblem

persists,suspect

thattheECU

isfaulty.

Resistanceis

9002000ohms


interm

ittentopenorshortin

circuits377LFand377LF+.

Iftheproblem

persists,suspect

thattheECU

isfaulty.

4.Measure

theresistance

betweenpins7and8of

theX2(black)connector.

Resistanceis

greaterthan2000

ohmsOR

lessthan

900ohm.

Perform

test5.

Resistanceis

9002000ohms

Repairopenorshortin

circuits

377LFand377LF+in

chassis

harness.

136

001

05

Opencircuit

5.Disconnectthesensor

connectorfrom

thechassis

harness.Measure

the

resistancebetweenthe

pinsonthesensor

connector.

Resistanceis

greaterthan2000

ohmsOR

lessthan

900ohms

Replacethesensor.

136

001

06

Shortcircuit

Perform

tests

4and5.

136

001

07

Damagedtone

ring

Inspecttoneringfordamageand

missingteeth.Makesure

the

correcttoneringis

installed

(100-tooth

isthenorm

al

application).Repairasneeded.


ly2004

300/2

MeritorWABCO


(ABS)

42.00



001)

MID

SID

FMI

Problem

Test

TestResult

Action

136

001

08

Excessivewheel

slip

Checksensoradjustm

ent.This

faultusually

occurs

whenthere

isexcessivetire

spin

formore

than

16seconds.

136

001

09

Wiremismatch

6.Checkformixedsensor

connections.While

using

MeritorTOOLBOX

software,spin

eachwheel

individually.Confirm

that

theoutputis

from

the

correctsensor.

Correctwiringconnections,as

needed.

SignaloutputOK

Adjustm

entsolvedtheproblem.

Makesure

brakechatteris

not

causingtheproblem.

136

001

10

Interm

ittentsignal

7.Adjustthesensor.Using

thewheelsensoroutput

screenin

Meritor

TOOLBOXsoftware,spin

thewheelordrivethe

vehicle

andcheckfor

interm

ittentorerratic

signal.

Signaloutput

incorrect

Checkforinterm

ittentwheel

sensorcircuitconnections.(Brake

chattercancausethis

problem.)

Repairasneeded.

136

001

11

Erraticsignal

Perform

test7.

WiringOK

Iftheproblem

persists,suspect

thattheECU

isfaulty.

136

001

12

Frequencytoo

high

8.Checksensorwiring

andconnectors

for

interm

ittentcontact.

Wiringincorrect

Repairwheelsensorcircuit,as

needed.

Table2,LeftFrontWheelSensorTroubleshooting(SID

001)

RightFrontWheelSensorTroubleshooting(SID

002)

MID

SID

FMI

Problem

Test

TestResult

Action

Voltageis

0.2

VAC

orgreater

Sensoradjustm

entsolvedthe

problem.

136

002

01

Incorrectsensor

airgap

1.Adjustthesensor.

ChecktheAC

voltage


X2(black)ECU

connector

while

rotatingtheRF

wheel30rpm.

Voltageis

lessthan

0.2

VAC



Repairasneeded.

136

002

02

Incorrecttire

size

Checkforcorrecttire

sizeand

mixedtire


numberofteeth

ontonewheel.

Correctasneeded.

Measurable

voltage

atanypin

Iftheshortis

inthevehicle


Ifproblem

isin

thesensorcable,

replacethesensor.

136

002

03

Sensorshortedto

power

2.Measure

thevoltage

acrosspin

5oftheX2


goodchassis

ground.


pin

6andground.

Novoltageatany

pin


interm

ittentshortto

powerin

circuits377RF+and377RF.

Iftheproblem

persists,suspect

thattheECU

isfaulty.


ly2004

300/3

42.00

MeritorWABCO


(ABS)



002)

MID

SID

FMI

Problem

Test

TestResult

Action

Resistance

betweeneitherpin

andgroundis

less

than100,000ohms

Iftheshortis

inthevehicle


Ifproblem

isin

thesensorcable,

replacethesensor.

136

002

04

Shortto

ground

3.Measure

theresistance

betweenpin

5oftheX2


goodchassis

ground.


pin

6andground.

Resistance

betweeneitherpin

andgroundis

greaterthan

100,000ohms


ittent

shortto

groundin

circuits377RF+

and377RF.

Iftheproblem

persists,suspect

thattheECU

isfaulty.

Resistanceis

9002000ohms


interm

ittentopenorshortin

circuits377RF+and377RF.

Iftheproblem

persists,suspect

thattheECU

isfaulty.

4.Measure

theresistance

betweenpins5and6of

theX2(black)connector.

Resistanceis

greaterthan2000

ohmsOR

lessthan

900ohm.

Perform

test5.

Resistanceis

9002000ohms

Repairopenorshortin

circuit(s)

377RF+and377RFin

chassis

harness.

136

002

05

Opencircuit


connectorfrom

thechassis

harness.Measure

the


pinsonthesensor

connector.

Resistanceis

greaterthan2000

ohmsOR

lessthan

900ohms

Replacethesensor.

136

002

06

Shortcircuit

Perform

tests

4and5.

136

002

07

Damagedtone

ring



correct

toneringis

installed(100-tooth

isnorm

alapplication).Repairas

needed.

136

002

08

Excessivewheel

slip

Checksensoradjustm

ent.This

faultusually

occurs

whenthere

isexcessivetire

spin

formore

than

16seconds.

136

002

09

Wiremismatch


connection.UsingMeritor


eachwheelindividually.

Checkthatoutputis

from

thecorrectsensor.


needed.


ly2004

300/4

MeritorWABCO


(ABS)

42.00



002)

MID

SID

FMI

Problem

Test

TestResult

Action

SignaloutputOK

Adjustm


Makesure

brakechatteris

not

causingtheproblem.

136

002

10

Interm

ittentsignal



screenin

Meritor


thewheelordrivethe

vehicle

andcheckfor

interm

ittentorerratic

signal.

Signaloutput

incorrect

Checkforinterm

ittentwheel


chattercancausethis

problem.)

Repairasneeded.

136

002

11

Erraticsignal

Perform

test7.

WiringOK

Iftheproblem

persists,suspect

thattheECU

isfaulty.

136

002

12

Frequencytoo

high

8.Checksensorwiring

andconnectors

for

interm

ittentcontact.

Wiringincorrect


needed.

Table3,RightFrontWheelSensorTroubleshooting(SID

002)

LeftRearWheelSensorTroubleshooting(SID

003)

MID

SID

FMI

Problem

Test

TestResult

Action

Voltageis

0.2

VAC

orgreater

Sensoradjustm

entsolvedthe

problem.

136

003

01

Incorrectsensor

airgap

1.Adjustthesensor.

ChecktheAC

voltage


X3(green)ECU

connector

while

rotatingtheLR

wheel30rpm.

Voltageis

lessthan

0.2

VAC



Repairasneeded.

136

003

02

Incorrecttire

size

Checkforcorrecttire

sizeand

mixedtire


numberofteeth

ontonewheel.

Correctasneeded.

Measurable

voltage

atanypin

Iftheshortis

inthevehicle


Ifproblem

isin

thesensorcable,

replacethesensor.

136

003

03

Sensorshortedto

power

2.Measure

thevoltage

acrosspin

1oftheX3

(green)connectoranda

goodchassis

ground.


pin

2andground.

Novoltageatany

pin

Iftheproblem

persists,suspect

thattheECU

isfaulty.

Resistance

betweeneitherpin

andgroundis

less

than100,000ohms

Iftheshortis

inthevehicle


Iftheshortis

inthesensorcable,

replacethesensor.

136

003

04

Shortto

ground

3.Measure

theresistance

betweenpin

1oftheX3


goodchassis

ground.


pin

2andground.

Resistance

betweeneitherpin

andgroundis

greaterthan

100,000ohms


ittent

shortto

groundin

circuits377LR+

and377LR.

Iftheproblem

persists,suspect

thattheECU

isfaulty.


ly2004

300/5

42.00

MeritorWABCO


(ABS)


LeftRearWheelSensorTroubleshooting(SID

003)

MID

SID

FMI

Problem

Test

TestResult

Action

Resistanceis

9002000ohms


interm

ittentopenorshortin

circuits377LR+and377LR.

Iftheproblem

persists,suspect

thattheECU

isfaulty.

4.Measure

theresistance

betweenpins1and2of

theX3(green)connector.

Resistanceis

greaterthan2000

ohmsOR

lessthan

900ohm.

Perform

test5.

Resistanceis

9002000ohms

Repairopenorshortin

circuit(s)

377LR+and377LRin

chassis

harness.

136

003

05

Opencircuit


connectorfrom

thechassis

harness.Measure

the


pinsonthesensor

connector.

Resistanceis

greaterthan2000

ohmsOR

lessthan

900ohms

Replacethesensor.

136

003

06

Shortcircuit

Perform

tests

4and5.

136

003

07

Damagedtone

ring



correct

toneringis

installed(100-tooth

isnorm


needed.

136

003

08

Excessivewheel

slip

Checksensoradjustm

ent.This

faultusually

occurs

whenthere

isexcessivetire

spin

formore

than

16seconds.

136

003

09

Wiremismatch


connection.UsingMeritor



Checkthatoutputis

from

thecorrectsensor.


needed.

SignaloutputOK

Adjustm


Makesure

brakechatteris

not

causingtheproblem.

136

003

10

Interm

ittentsignal



screenin

Meritor


thewheelordrivethe

vehicle

andcheckfor

interm

ittentorerratic

signal.

Signaloutput

incorrect

Checkforinterm

ittentwheel


chattercancausethis

problem.)

Repairasneeded.

136

003

11

Erraticsignal

Perform

test7.

WiringOK

Iftheproblem

persists,suspect

thattheECU

isfaulty.

136

003

12

Frequencytoo

high

8.Checksensorwiring

andconnectors

for

interm

ittentcontact.

Wiringincorrect


needed.

Table4,LeftRearWheelSensorTroubleshooting(SID

003)


ly2004

300/6

MeritorWABCO


(ABS)

42.00


RightRearWheelSensorTroubleshooting(SID

004)

MID

SID

FMI

Problem

Test

TestResult

Action

Voltageis

0.2

VAC

orgreater

Sensoradjustm

entsolvedthe

problem.

136

004

01

Incorrectsensor

airgap

1.Adjustthesensor.

ChecktheAC

voltage


X3(green)ECU

connector

while

rotatingtheRR

wheel30rpm.

Voltageis

lessthan

0.2

VAC



Repairasneeded.

136

004

02

Incorrecttire

size

Checkforcorrecttire

sizeand

mixedtire


numberofteeth

ontonewheel.

Correctasneeded.

Measurable

voltage

atanypin

Iftheshortis

inthevehicle


Iftheproblem

isin

thesensor


136

004

03

Sensorshortedto

power

2.Measure

thevoltage

acrosspin

3oftheX3


goodchassis

ground.


pin

4andground.

Novoltageatany

pin

Iftheproblem

persists,suspect

thattheECU

isfaulty.

Resistance

betweeneitherpin

andgroundis

less

than100,000ohms

Iftheshortis

inthevehicle


Iftheproblem

isin

thesensor


136

004

04

Shortto

ground

3.Measure

theresistance

betweenpin

3oftheX3


goodchassis

ground.


pin

4andground.

Resistance

betweeneitherpin

andgroundis

greaterthan

100,000ohms


ittent

shortto

groundin

circuits377RR+

and377RR.

Iftheproblem

persists,suspect

thattheECU

isfaulty.

Resistanceis

9002000ohms


interm

ittentopenorshortin

circuits377RR+and377RR.

Iftheproblem

persists,suspect

thattheECU

isfaulty.

4.Measure

theresistance

betweenpins3and4of

theX3(green)connector.

Resistanceis

greaterthan2000

ohmsOR

lessthan

900ohms.

Perform

test5.

Resistanceis

9002000ohms

Repairopenorshortin

circuit(s)

377RR+and377RRin

chassis

harness.

136

004

05

Opencircuit


connectorfrom

thechassis

harness.Measure

the


pinsonthesensor

connector.

Resistanceis

greaterthan2000

ohmsOR

lessthan

900ohms

Replacethesensor.

136

004

06

Shortcircuit

Perform

tests

4and5.

136

004

07

Damagedtone

ring



correct

toneringis

installed(100-tooth

isnorm


needed.


ly2004

300/7

42.00

MeritorWABCO


(ABS)


RightRearWheelSensorTroubleshooting(SID

004)

MID

SID

FMI

Problem

Test

TestResult

Action

136

004

08

Excessivewheel

slip

Checksensoradjustm

ent.This

faultusually

occurs

whenthere

isexcessivetire

spin

formore

than

16seconds.

136

004

09

Wiremismatch


connections.UsingMeritor



Checkthatoutputis

from

thecorrectsensor.


needed.

SignaloutputOK

Adjustm


Makesure

brakechatteris

not

causingtheproblem.

136

004

10

Interm

ittentsignal



screenin

Meritor


thewheelordrivethe

vehicle

andcheckfor

interm

ittentorerratic

signal.

Signaloutput

incorrect

Checkforinterm

ittentwheel


chattercancausethis

problem.)

Repairasneeded.

136

004

11

Erraticsignal

Perform

test7.

WiringOK

Iftheproblem

persists,suspect

thattheECU

isfaulty.

136

004

12

Frequencytoo

high

8.Checksensorwiring

andconnectors

for

interm

ittentcontact.

Wiringincorrect


needed.

Table5,RightRearWheelSensorTroubleshooting(SID

004)

LeftFrontModulatorValveTroubleshooting(SID

007)

MID

SID

FMI

Problem

Test

TestResult

Action

Novoltageatany

pin

Repeattest.Checkcircuits

378LFI,378LFO,and378LFfor

interm

ittentshortto

power.Check

abovecircuitsforshortsto

other

modulatorvalvewires.Repairas

necessary.

Iftheproblem

persists,suspect

thattheECU

isatfault.

136

007

03

Shortto

power

Inletoroutlet

circuitshortedto

battery

supply

or

anothermodulator

valvewire.

1.Measure

thevoltage

betweenpins2,10,and

11oftheX2(black)

connectorandagood

chassis

ground.

Measurable

voltage

atanypin

Repairshortto

powerin

circuit

378LFI,378LFO,or378LF.

Resistancein

both

circuitsis

within

4to

9ohms.

Checkharnesswiringcircuits

378LFI,378LFO,or378LFfor

poororopenconnections.Repair

asnecessary.

136

007

05

Opencircuit

Inletoroutlet

circuitopen.

2.Measure

themodulator

valveinletandoutletcircuit

resistance.Disconnectthe

connectorfrom

thevalve

andperform

themodulator

valveresistancetest.

Resistancein

both

circuitsis

notwithin

4to

9ohms.

Replacethemodulatorvalve.


ly2004

300/8

MeritorWABCO


(ABS)

42.00


LeftFrontModulatorValveTroubleshooting(SID

007)

MID

SID

FMI

Problem

Test

TestResult

Action

Resistancein

both

circuitsis

within

4to

9ohms.


378LFIand378LFO

forshortto

ground.Repairasnecessary.

136

007

06

Shortto

ground

Inletoroutlet

circuitshortedto

ground.

3.Measure

themodulator



connectorfrom

thevalve

andperform

themodulator


Resistancein

both

circuitsis

notwithin

4to

9ohms.

Replacemodulatorvalve.

Table6,LeftFrontModulatorValveTroubleshooting(SID

007)

RightFrontModulatorValveTroubleshooting(SID

008)

MID

SID

FMI

Problem

Test

TestResult

Action

Novoltageatany

pin


378RFO,378RFI,and378RFfor

interm

ittentshortto

power.Check


other


necessary.

Iftheproblem

persists,suspect

thattheECU

isatfault.

136

008

03

Shortto

power

Inletoroutlet

circuitshortedto

battery

supply

or

anothermodulator

valvewire.

1.Measure

thevoltage

betweenpins3,4,and9

oftheX2(black)

connector,andagood

chassis

ground.

Measurable

voltage

atanypin

Repairshortto

powerin

circuit

378RFO,378RFI,or378RF.

Resistancein

both

circuitsis

within

4to

9ohms.


378RFO,378RFI,or378RFfor


asnecessary.

136

008

05

Opencircuit

Inletoroutlet

circuitopen.

2.Measure

themodulator



connectorfrom

thevalve

andperform

themodulator


Resistancein

both

circuitsis

notwithin

4to

9ohms.


Resistancein

both

circuitsis

within

4to

9ohms.


378RFO

and378RFIforshortto


136

008

06

Shortto

ground

Inletoroutlet

circuitshortedto

ground.

3.Measure

themodulator



connectorfrom

thevalve

andperform

themodulator


Resistancein

both

circuitsis

notwithin

4to

9ohms.


Table7,RightFrontModulatorValveTroubleshooting(SID

008)


ly2004

300/9

42.00

MeritorWABCO


(ABS)


LeftRearModulatorValveTroubleshooting(SID

009)

MID

SID

FMI

Problem

Test

TestResult

Action

Novoltageatany

pin


378LRI,378LRO,and378LRfor

interm

ittentshortto

power.Check


other


necessary.

Iftheproblem

persists,suspect

thattheECU

isatfault.

136

009

03

Shortto

power

Inletoroutlet

circuitshortedto

battery

supply

or

anothermodulator

valvewire.

1.Measure

thevoltage

betweenpins10,11,and

12oftheX3(green)

connectorandagood

chassis

ground.

Measurable

voltage

atanypin

Repairshortto

powerin

circuit

378LRI,378LRO,or378LR.

Resistancein

both

circuitsis

within

4to

9ohms.


378LRI,378LRO,and378LRfor


asnecessary.

136

009

05

Opencircuit

Inletoroutlet

circuitopen.

2.Measure

themodulator



connectorfrom

thevalve

andperform

themodulator


Resistancein

both

circuitsis

notwithin

4to

9ohms.


Resistancein

both

circuitsis

within

4to

9ohms.


378LRIand378LRO

forshortto


136

009

06

Shortto

ground

Inletoroutlet

circuitshortedto

ground.

3.Measure

themodulator



connectorfrom

thevalve

andperform

themodulator


Resistancein

both

circuitsis

notwithin

4to

9ohms.


Table8,LeftRearModulatorValveTroubleshooting(SID

009)

RightRearModulatorValveTroubleshooting(SID

010)

MID

SID

FMI

Problem

Test

TestResult

Action

Novoltageatany

pin


378RRO,378RR,and378RRI

forinterm

ittentshortto

power.

Checkabovecircuitsforshortsto

othermodulatorvalvewires.

Repairasnecessary.

Iftheproblem

persists,suspect

thattheECU

isatfault.

136

010

03

Shortto

power

Inletoroutlet

circuitshortedto

battery

supply

or

anothermodulator

valvewire.

1.Measure

thevoltage

betweenpins7,8,and9

oftheX3(green)

connectorandagood

chassis

ground.

Measurable

voltage

atanypin

Repairshortto

powerin

circuit

378RRO,378RR,or378RRI.

Resistancein

both

circuitsis

within

4to

9ohms.


378RRO,378RR,and378RRI

forpoororopenconnections.

Repairasnecessary.

136

010

05

Opencircuit

Inletoroutlet

circuitopen.

2.Measure

themodulator



connectorfrom

thevalve

andperform

themodulator


Resistancein

both

circuitsis

notwithin

4to

9ohms.



ly2004

300/10

MeritorWABCO


(ABS)

42.00


RightRearModulatorValveTroubleshooting(SID

010)

MID

SID

FMI

Problem

Test

TestResult

Action

Resistancein

both

circuitsis

within

4to

9ohms.


378RRO

and378RRIforshortto


136

010

06

Shortto

ground

Inletoroutlet

circuitshortedto

ground.

3.Measure

themodulator



connectorfrom

thevalve

andperform

themodulator


Resistancein

both

circuitsis

notwithin

4to

9ohms.


Table9,RightRearModulatorValveTroubleshooting(SID

010)

GroundFaultsTroubleshooting(SID

014)

MID

SID

FMI

Problem

Test

TestResult

Action

Voltageis

9.5

to14

volts.

System

voltageis

acceptable.

Checkforinterm

ittentlow

voltage.

Checkthebatteriesandcharging

system.Voltagemayhavebeen

temporarily

toolow.Repairas

necessary.

136

014

04

Low

voltageor

opencircuit

1.DisconnecttheX1

(gray)connectoratthe

ABSECU.Withtheignition

ON,measure

thevoltage

betweenpins1and12.

Voltageis

lessthan

9.5

volts.

Checkvehicle

batteriesand

chargingsystem.CheckABS

ECU

powerandgroundcircuitsfor

openorhighresistance.Repairas

necessary.

Groundis

okay

Verify

thefault.Checktheground

circuitsinterm

ittentopencircuit.

Repairasnecessary.

136

014

05

Centralground

openorhigh

resistance

2.DisconnecttheX1(gray)

connectorattheABS

ECU.Checktheground

circuit(pin

11)forhigh

resistanceoropencircuit.

Groundis

openor

hashighresistance

Repairgroundcircuitas

necessary.

136

014

07

Internalrelay

doesnotopen

Ifthefaultrepeats,replacethe

ABS

ECU.

Table10,GroundFaultsTroubleshooting(SID

014)


015)

MID

SID

FMI

Problem

Test

TestResult

Action

Voltageatpin

6.

Circuit378Tis

shortedto

power.

Locate

faultandrepairas

necessary.

136

015

03

ATC

valvecircuit

shortedto

power.

1.DisconnecttheX3

(green)connector,check

forvoltagebetweenpin

6andground.

Novoltageatpin

6.Verify

fault.Checkforinterm

ittent

faultin

circuit378T,repairas

necessary.

Voltageis

9.5

to14

volts

System

voltageis

acceptable.

Checkforinterm

ittentlow

voltage.

Checkthebatteriesandcharging

system.Voltagemayhavebeen

temporarily

toolow.Repairas

necessary.

136

015

04

Low

voltageor

opencircuit

2.DisconnecttheX1

(gray)connectoratthe

ABSECU.Withthe

ignitionON,measure

the

voltagebetweenpin

2and

agoodground.

Voltageis

lessthan

9.5

volts

Repairvoltagesupply

toECU.


ly2004

300/11

42.00

MeritorWABCO


(ABS)



015)

MID

SID

FMI

Problem

Test

TestResult

Action

136

015

05

ATC

valve-High

Impedance

ReplacetheABSECU

ifthefault

persists.

Resistanceis

less

than10,000ohms

Circuit378Tis

shortedto


136

015

06

ATC

valvecircuit

shortedto

ground

DisconnecttheX3(green)

connector,check

resistancebetweenpin

6andagoodground.

Resistanceis

greaterthan

10,000ohms

Verify


ittent

faultin

circuit378T,repairas

necessary.

136

015

07

Internalrelayfault

Ifthefaultrepeats,replacethe

ABSECU.

Table11,GroundFaultsTroubleshooting(SID

015)

ATCValveTroubleshooting(SID

018)

MID

SID

FMI

Problem

Test

TestResult

Action

Voltage

Circuit378T+is

shortedto

power.

Repairasnecessary.

136

018

03

Shortto

power.

1.DisconnecttheX3

(green)connectorfrom

the

ABSECU.Disconnectthe

ATC

valveconnector.

Measure

thevoltage

betweenpin

5oftheX3


goodchassis

ground.

Novoltage

Checkcircuit378T+for

interm

ittentshortto

power.Repair

asnecessary.Ifthefaultpersists,

suspectthattheECU

isatfault.

Resistanceis

7to

14ohms.

Perform

test3.

2.DisconnecttheATC

valveconnector.Measure

thecontinuityacrossthe

twopinsoftheATC

valve.

NOTE

Ifthe

vehicle

does

nothaveanATC

valve,re-

configure

theECU.

Resistanceis

not7

to14ohms.

ReplaceATC

valve.

Resistanceis

7to

14ohms.

Verify


ittent

opencircuitin

378T+and378T.

Repairasnecessary.

136

018

05

Opencircuit

3.ReconnecttheATC

valveconnector.Measure

theresistanceacrosspins

5and6oftheX3(green)

connector.

Resistanceis

not7

to14ohms.

Repaircircuit378T+or378T.

Continuity

Circuit378T+is

shortedto


136

018

06

Shortto

ground.

4.DisconnecttheX3

(green)connector.Check

continuitybetweenpin

5andagoodground.

Nocontinuity

Verify

fault.Checkcircuit378T+

forinterm

ittentshortto

ground.

Repairasnecessary.

Table12,ATCValveTroubleshooting(SID

018)


ly2004

300/12

MeritorWABCO


(ABS)

42.00


Auxiliary

OutputTroubleshooting(Notfitted,butpossibleto

encountererrorcode)(SID

019)

MID

SID

FMI

Problem

Action

136

019

03

Shortto

power

This

faultshould

notappear.Re-configure

theECU.Iffaultcontinuesto

appear,

checkthewiringin

theX2(black)ABSECU

connector.Pins1and12should

be

unused.Makesure

there

are

noconnectionsto

thesepins.Ifincorrectwiringis

found,correctitandreconfigure

theECU.Ifthis

doesnotcorrecttheproblem,

contactMeritorWABCO.

136

019

05

Opencircuit

Verify

fault.ContactMeritorWABCO

iffaultpersists.

136

019

06

Shortto

ground

This

faultshould

notappear.Reconfigure

theECU.Iffaultcontinuesto

appear,check

thewiringin

theX2(black)ABS

ECU

connector.Pins1and12should

beunused.

Makesure

there

are

noconnectionto

thesepins.Ifincorrectwiringis

found,correct

itandreconfigure

theECU.Ifthis

doesnotcorrecttheproblem,contactMeritor.

Table13,Auxiliary

OutputTroubleshooting(SID

019)

J1939DatalinkTroubleshooting(SID

231)

MID

SID

FMI

Problem

Test

Action

136

231

02

J1939speed

plausibility

error.

NOTE:

This

fault

indicates

adis-

crepancy

between

vehicle

speed

re-

ported

on

J1939

and

ABS

sensed

vehicle

speed.

Checkthespeedometercalibration.Checkforthetire

sizemismatch.Thevehicle

speedreportedonthe

J1939databusdoesnotagreewiththewheelsensor

speeds.

136

231

05

J1939open/short

RepairJ1939datalinkasnecessary.

136

231

06

J1939open/short

Code136s23105

maybeactiveas

well.

RepairJ1939datalinkasnecessary.

136

231

07

J1939timeout

NOTE:

Fault

oc-

curs

ifengine

re-

tardersendsmes-

sageincorrectly.

Checktheengineretarder,

ECU

andwires.

CheckJ1939datalinkandengineECU.Repairas

necessary.

136

231

08

J1939timeout

NOTE:

Fault

oc-

curs

ifengine

re-

tardersendsmes-

sageincorrectly.

CheckengineECU

and

wires.CheckJ1939

datalink.


necessary.

136

231

09

J1939timeout

NOTE:

Fault

oc-

curs

ifengine

or

transmission

sends

message

incorrectly.

Checkengineand

transmissionECUsand

wires.CheckJ1939

datalink.

CheckJ1939datalink,engineECU,transmissionECU,

andwiring.Repairasnecessary.


ly2004

300/13

42.00

MeritorWABCO


(ABS)


J1939DatalinkTroubleshooting(SID

231)

MID

SID

FMI

Problem

Test

Action

136

231

10

J1939timeout

NOTE:

Fault

oc-

curs

iftheexhaust

retarder

sends

amessage

incor-

rectly.

ChecktheengineECU

andwires.Checkthe

J1939datalink.


necessary.

136

231

12

J1939internal

error

Verify

fault.Clearcodefrom

theECU

memory.Iffault

persists,replacetheABSECU.

Table14,J1939DatalinkTroubleshooting(SID

231)

VoltageTroubleshooting(SID

251)

MID

SID

FMI

Problem

Test

TestResult

Action

Voltageis

9.5

to14

volts

Checkforinterm

ittentsourcesof

highvoltage.Checkconditionof

chargingsystem

andbatteries.

Verify

fault.

136

251

03

Overvoltage

Voltageto

ECU

wastoohighfor

more

than5

seconds.

Settheengineat

governedspeed.Using

MeritorTOOLBOX

software,measure

the

diagonalvoltages.

Voltageis

greater

than14volts.

Checkchargingsystem.Repairas

necessary.

Table15,VoltageTroubleshooting(SID

251)

ConfigurationErrors

Troubleshooting(SID

253)

MID

SID

FMI

Problem

Action

136

253

01

ATC

configurationerror

NOTE:ATC

valve

isdetected

withoutengine

datalink(J1939).

CheckJ1939forproperwiring.CheckengineECU

for

communication.Repairasnecessary,thenreconfigure

ECU.

136

253

02

ABSconfiguration/wheelparameterincorrect.

Reconfigure

ECU.Ifthefaultrepeats

thenthewrong

ECU

isinstalled.ReplacewiththecorrectECU.

136

253

12

Checksum

error.

Checkparametersetting.Checkifdiagnosticdevice

wasdisconnectedduringactivediagnosis.

Table16,ConfigurationErrors

Troubleshooting(SID

253)

MiscellaneousFaultsTroubleshooting(SID

254)

MID

SID

FMI

Problem

Action

136

254

05

ABS/ATC

ECU,noloads

Nomodulatorvalveconnected.Faultmayhaveresulted

from

end-of-linetestatfactory.

136

254

08

Excessivewheelslip.

Checkwheelspeedsensorairgaps.Onewheelwas

muchfasterthantheother.Mayhavebeencausedby

testingvehicle

onadynamometer.

136

254

09

Modulatorvalveactuatedtoolong.

Modulatorvalvewasactivatedtoolong(m

ore

than75%

of5minutes).Afteradelay,

functionwillreturn

tonorm

al.

136

254

12

Internalerror

Ifthefaultpersists,replacetheABSECU.


ly2004

300/14

MeritorWABCO


(ABS)

42.00


MiscellaneousFaultsTroubleshooting(SID

254)

MID

SID

FMI

Problem

Action

136

254

13

Accelerometeroutofrange

Ifthefaultpersists,replacetheABS

ECU.

ECU

Mounting

CheckECU

mounting.ReplacetheECU

ifthefault

persists.

Extremebankedroad(m

easuredacceleration

notplausible)

136

254

14

Accelerometerlinearity

(measuredacceleration

notplausible)

Nocorrectionrequired.This

faultis

forreportingonly.

Table17,MiscellaneousFaultsTroubleshooting(SID

254)

WheelSpeedSensorTests

WheelSpeedSensorandCircuit

Resistance

Tochecktheresistancein

awheelspeedsensorand

itscircuit,refertoFig.1andperform

thefollowingtest:

1.

Park

thevehicle

onalevelsurface,settheparking

brake,andshutdowntheengine.Chocktherear

tires.

2.

Disconnectfrom

theECU

theconnectorthatcon-

tainsthecircuitforthesensorbeingtested.See

Table18fordetaile

dpinoutinform

ation.

3.

Connectohmmeterprobesto

theconnectorterm

i-nals

andmeasure

theresistance.

Iftheresistanceis

900to

2000ohms,the

sensoranditscircuitare

good.Proceedto

the"W

heelSpeedSensorVoltage"test.

Iftheresistance

islessthan

900ohmsor

greaterthan

2000

ohms,perform

the

next

test,"W

heelSpeedSensorResistance."

4.

Connectthesensorconnectorto

theECU.

WheelSpeedSensorResistance

To

check

the

resistance

ina

wheelspeed

sensor,

perform

thefollowingtest:

1.

Park

thevehicle


brake,andshutdowntheengine.Chocktherear

tires.

2.

Disconnectthe

sensorcable

from

the

chassis

harness.

3.

Connectohmmeterprobes

tothe

pins

on

the

sensorandmeasure

theresistance.

If

the

resistance

reading

is900

to2000

ohmsbuttheresistancenotedin

theprevi-

oustest,"W

heelSpeedSensorandCircuit

Resistance"wasnot,repair

orreplacethe

chassis

harnesswiring.

Iftheresistance

islessthan

900ohmsor

greater2000ohms,cleantheterm

inals

and

checktheresistanceagain.Iftheresistance

readingis

stillnotcorrect,replacethesen-

sor.

4.

Connectthesensorcable

tothechassis

harness

andremovethechocksfrom

thetires.

WheelSpeedSensorVoltage

NOTE:MeritorTOOLBOX

software

can

be

used

for

thistestto

compare

speedsignaloutputofallsensors.

Low

orerraticoutputindicatesaproblem.

Tocheckthevoltageoutputofawheelspeedsensor:

1.

Park

thevehicle


brake,andshutdowntheengine.

2.

Chockthetiresoftheaxle

notbeingtested.Raise

thevehicle

andputjackstandsundertheaxle

tobetested,sothewheels

canrotate.

3.

Disconnectfrom

the

ECU

the

connectorforthe

sensorbeing

tested.SeeTable

18

fordetaile

dpinoutinform

ation.

4.

Setadigitalmultim

eterto

theAC

voltmetermode.

Connecttheprobesto

theterm

inals

forthesensor

beingtested.


ly2004

300/15

códigos de falla abs

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