MACK VMAC IV 144 User Manual

ServiceManual

VehicleElectronicControlUnit(MID144),DiagnosticTrouble

Code(DTC),Guide

Frombuilddate1.2007

Trucks

Group36

PV776-88951780

Foreword

Thedescriptionsandserviceprocedurescontainedinthismanualarebasedondesignsand
methodsstudiescarriedoutuptoJanuary2010.

Theproductsareundercontinuousdevelopment.Vehiclesandcomponentsproducedafterthe
abovedatemaythereforehavedifferentspecicationsandrepairmethods.Whenthisisbelieved
tohaveasignicantbearingonthismanual,supplementaryservicebulletinswillbeissuedtocover
thechanges.

Theneweditionofthismanualwillupdatethechanges.

Inserviceprocedureswherethetitleincorporatesanoperationnumber ,thisisareferencetoa
LaborCode(StandardTime).

Serviceprocedureswhichdonotincludeanoperationnumberinthetitleareforgeneralinformation
andnoreferenceismadetoaLaborCode(StandardTime).

Eachsectionofthismanualcontainsspecicsafetyinformationandwarningswhichmustbe
reviewedbeforeperforminganyprocedure.Ifaprintedcopyofaprocedureismade,besureto
alsomakeaprintedcopyofthesafetyinformationandwarningsthatrelatetothatprocedure.The
followinglevelsofobservations,cautionsandwarningsareusedinthisServiceDocumentation:

Note:Indicatesaprocedure,practice,orconditionthatmustbefollowedinordertohavethe
vehicleorcomponentfunctioninthemannerintended.

Caution:Indicatesanunsafepracticewheredamagetotheproductcouldoccur.

Warning:Indicatesanunsafepracticewherepersonalinjuryorseveredamagetotheproduct

couldoccur.

Danger:Indicatesanunsafepracticewhereseriouspersonalinjuryordeathcouldoccur.

MackTrucks,Inc.

Greensboro,NCUSA

Ordernumber:PV776-88951780

Repl:

©2010MackTrucks,Inc.,Greensboro,NCUSA

Allrightsreserved.Nopartofthispublicationmaybereproduced,storedinretrievalsystem,
ortransmittedinanyformsbyanymeans,electronic,mechanical,photocopying,recordingor
otherwise,withoutthepriorwrittenpermissionofMackTrucks,Inc.

USA39418

Contents

DesignandFunction....................................................................................................................3

MID144VehicleControlUnit.......................................................................................................3

Troubleshooting..........................................................................................................................4

VehicleControlUnit,FaultTracing................................................................................................4

1

2

Group36

DesignandFunction

MID144VehicleControlUnit

Themanufacturerdiagnostictoolisthepreferredtoolfor
performingdiagnosticwork.Contactyourlocaldealerfor
moreinformationorvisit“www.premiumtechtool.com”.

SystemOverview

MID144VehicleControlUnit

TheVehicleElectronicControlUnit(VECU)isamicroprocessor
basedcontroller,programmedtoperformseveralfunctions,
theseinclude:

•Drivercontrols

•Vehicleandenginespeedcontrols

•Startercontrol

•Cabpower

•Broadcastingdataontheserialdatalines

•Tripdatalogging

•Diagnosticfaultloggingandpasswordprocessing

TheVECUperformsthesefunctionsbymonitoringthesignals
fromsensorsandswitches,anddatareceivedovertheserial
datalinesfromtheothermodules.TheVECUdirectlymonitors
theThrottlePosition(TP)SensorandVehicleSpeedSensor
(VSS).

TheVECUalsomonitorsthepositionorstateofmultiple
switches,toperformitscontrolanddiagnosticfunctions.The
switchesinclude:

•A/CPressureSwitch

•AirSuspensionHeightControlSwitch

•DifferentialLockSwitch

•EngineBrakeSwitches

•IgnitionKeySwitch

•PTOSwitches(ifequipped)

•ServiceandParkBrakeSwitches

•SpeedControlSwitches(Set/Decel,Resume/Accel)

•5thWheelSlideSwitch

TheVECUcommunicateswithothermodulesandsharesits
inputsthroughtheSAEJ1939highspeeddatalinkaswellas
theSAEJ1587normalspeeddatalink.TheSAEJ1587data
linkisprimarilyusedforprogramming,diagnosticsanddata
reporting.

vehicleoperatorwillbeadvisedthatafaulthasoccurredbythe
illuminationofamalfunctionindicatorlampandamessagein
thedriverinformationdisplay,ifequipped.

Whendiagnosinganintermittentcodeorcondition,itmay
benecessarytouseadiagnosticcomputerconnectedtothe
SerialCommunicationPort.Additionaldataanddiagnostic
testsareavailablewhenadiagnostictoolisconnectedtothe
SerialCommunicationPort.

Fordiagnosticsoftware,contactyourlocaldealerorvisit
“www.premiumtechtool.com”.

Inadditiontoswitchandsensordata,thebroadcastbetween
modulesalsoincludesvariouscalculationsandconclusions
eachmodulehasdeveloped,basedontheinputinformation
ithasreceived.Thesecalculationsandconclusionsare
partofthemoduleson-boarddiagnosticcapability .The
on-boarddiagnosticsaredesignedtodetectfaultsorabnormal
conditionsthatarenotwithinnormaloperatingparameters.
Whenthesystemdetectsafaultorabnormalcondition,the
faultwillbeloggedinoneorbothofthemodules’memory,the

3

Group36

Troubleshooting

VehicleControlUnit,FaultTracing

Themanufacturerdiagnostictoolisthepreferredtoolfor
performingdiagnosticwork.Contactyourlocaldealerfor
moreinformationorvisit“www.premiumtechtool.com”.

ThecontrolmodulesontheSAEJ1587datalinkcommunicate
accordingtotheSAEJ1587standard.Thestandardhasbeen
extendedwithMack’ssupplement(PPID,PSID).Thefault
codessetbythecontrolmodulescontaininformationthatis
describedbythefollowingabbreviations.

VehicleControlUnit,FaultTracing

MIDMessageIdenticationDescription:

Identicationofacontrolmodule.

PIDParameterIdenticationDescription:

Identicationofaparameter(value).

PPIDProprietaryParameterIdentication

DescriptionMack:
Uniqueidenticationofaparameter(value).

FMIT able

FMIDisplayT ext

0ToohighvalueDatavalid,butabovethenormalworkrange

1ToolowvalueDatavalid,butbelowthenormalworkrange

2IncorrectdataDataerratic,Intermittentorincorrect

3

4

5

6

7

8

9

10

11

12

13Incorrectcalibration

14

15

Electricalfault

Electricalfault

ElectricalfaultCurrentbelownormaloropencircuit

ElectricalfaultCurrentabovenormalorgroundedcircuit

Mechanicalfault

MechanicalorelectricalfaultAbnormalfrequency,pulsewidthorperiod

Communicationfault

MechanicalorelectricalfaultAbnormalrateofchange

UnknownfaultFailuremodenotidentiable

Componentfault

UnknownfaultSpecialinstructions

UnknownfaultReservedforfutureassignmentbySAEDataFormalSubcommittee

SAET ext

Voltageabovenormalorshortedhigh

Voltagebelownormalorshortedlow

Mechanicalsystemnotrespondingproperly

Abnormalupdaterate

Badintelligentdeviceorcomponent

Outofcalibration

SIDSubsystemIdenticationDescription:

PSIDProprietarySubsystemIdentication

FMIFailureModeIdentier:

Identicationofacomponent.

DescriptionMack:
Uniqueidenticationofacomponent.

Identicationoffaulttypes.

4

Group36

MID144VehicleECU,FaultCodes

PID

“MID144PID83RoadSpeedLimitStatus”,page7

“MID144PID84VehicleSpeed”,page7

“MID144PID86CruiseControl,SetSpeed”,page7

“MID144PID91AcceleratorPedalPosition(Percentage)”,page8

“MID144PID152VehicleECU,NumberofResets”,page8

“MID144PID191OutputShaftSpeed”,page8

PPID

“MID144PPID3StarterrelayOutput”,page9

“MID144PPID60IdleV alidationSwitch,Power”,page9

“MID144PPID69BufferedIdleValidationSwitch”,page9

“MID144PPID70PedalSwitches,Supply”,page9

“MID144PPID71CruiseControlandEngineBrake,SwitchSupply”,page9

“MID144PPID72AcceleratorPedalandEngineBrake,SensorsSupply”,page10

“MID144PPID73SecondAcceleratorPedal,SupplySensors”,page10

“MID144PPID74VehicleECU,PowerSupply”,page11

“MID144PPID265V ehicleSpeedSensorSupply”,page11

“MID144PPID279Airdryer ,DryAgentReservoir”,page11

“MID144PPID312AirDryer,Regeneration”,page11

“MID144PPID430AirDryer,Regeneration”,page12

VehicleControlUnit,FaultTracing

SID

“MID144SID230IdleV alidationSwitch1”,page12

“MID144SID231SAEJ1939DataLink”,page12

“MID144SID240ProgramMemory”,page12

“MID144SID243CruiseControlSetSwitch”,page12

“MID144SID250SAEJ1587DataLink”,page13

“MID144SID253CalibrationMemoryEEPROM”,page13

5

Group36

VehicleControlUnit,FaultTracing

PSID

“MID144PSID1RetarderControlSetSwitch”,page13

“MID144PSID2IdleV alidationSwitch2”,page13

“MID144PSID4EngineBrakeStalkLever”,page14

“MID144PSID8NeutralPositionError”,page14

“MID144PSID14DataMaxGeneralError”,page14

“MID144PSID16PowerRelay1”,page14

“MID144PSID17PowerRelay2”,page15

“MID144PSID20PowerT ake-offSignal”,page15

“MID144PSID23AirDryer,Regenerating”,page15

“MID144PSID24Compressor,Control”,page15

“MID144PSID25AirLeakage”,page16

“MID144PSID200CommunicationInterference,DataLink,EngineControlModule(ECM)”,page16

“MID144PSID202CommunicationInterference,DataLink,Instrumentation”,page16

“MID144PSID204CommunicationInterference,DataLink,BrakeControlModule”,page16

“MID144PSID205CommunicationInterference,DataLink,TransmissionControlModule”,page17

“MID144PSID206CommunicationInterference,DataLink,RetarderControlModule”,page17

“MID144PSID207CommunicationInterference,DataLink,GearSelectorControlModule”,page17

“MID144PSID208CommunicationInterference,DataLink,AirSuspension”,page17

“MID144PSID210SAEJ1939DataLinkInterruption,LightingControlModule(LCM)”,page17

“MID144PSID21 1SAEJ1939DataLinkInterruption,CollisionAvoidanceControlModule”,page18

“MID144PSID214DataLink,BodybuilderControlModule”,page18

“MID144PSID230SoftwareFault”,page18

6

Group36

MID144PID83RoadSpeedLimitStatus

VehicleControlUnit,FaultTracing

Typeof
fault:

FMI14

FMIDescription:

•Specialinstructions•Lowair

MID144PID84VehicleSpeed

Typeof
fault:

FMI2

FMI5

FMI6

FMI14

FMIDescription:

•Intermittentor

incorrectdata

•Currentbelow

normaloropen
circuit

•Currentabove

normalorgrounded
circuit

•Specialinstructions•Intermittentfaulty

FaultCondition:

suspension
roadspeed
limitexceeded
(Driverexceeded
limitwithAir
Suspension
lowered)

FaultCondition:

•Speedsignalfrom

speedometerand
ABSdifferstoo
much

•Sensoropenor

shortedtoground

•Shortacross

sensor

data

•Speedsignalfrom

VSSwasupdated
incorrectly

Possible
Symptoms:

PossibleCause:

•N/A•Exceedingroadspeedlimitwithair

suspensionlowered

Possible
Symptoms:

•Gauge

drops/inoperable

•Incorrectroad

speeddisplayed
incluster

•Incorrectroad

speeddisplayed
incluster

•Incorrectroad

speeddisplayed
incluster

•Incorrectroad

speeddisplayed
incluster

PossibleCause:

•VSSHarness

•VSSSensor

•WrongK-factoryvalue(MGandMH

parameterinVECU)

•ABSreportedspeedmissingor

inconsistent

•VSSHarness/connector

•VSSSensor

•VSSHarness/connector

•VSSSensor

•SAEJ1587datalink

•Wiringharness

MID144PID86CruiseControl,SetSpeed

Typeof
fault:

FMI14

FMIDescription:

FaultCondition:

•SpecialInstructions•TimeoutonACC1

messagewith
adamptivecruise
installed

Possible
Symptoms:

PossibleCause:

•N/A•FaultyornoinfofromACC(VORAD)

•Wiringharness

7

Group36

MID144PID91AcceleratorPedalPosition(Percentage)

VehicleControlUnit,FaultTracing

Typeof
fault:

FMI3

FMI4

FMI5

FMI6

FMI14

FMIDescription:

•Abnormallyhigh

voltageorshort
circuittohigher
voltage

•Abnormallylow

voltageorshort
circuittolower
voltage

•Abnormallylow

currentoropen
circuit

•Abnormallyhigh

currentorshort
circuittoground

FaultCondition:

•Voltageabove

4.3V

•Voltagebelow

0.4V

•Inputtoolow

comparedtoIVS1
&IVS2

•Inputtolow

comparedtoIVS1
&IVS2

•SpecialInstructions•SupplyErrorfrom

PPID72

Possible
Symptoms:

•Y ellowCheck

lamplit

•Enginewillnot

supplyrequested
fueltoengine

•Y ellowCheck

lamplit

•Enginewillnot

supplyrequested
fueltoengine

•Y ellowCheck

lamplit

•Enginewillnot

supplyrequested
fueltoengine

•Y ellowCheck

lamplit

•Enginewillnot

supplyrequested
fueltoengine

•Y ellowCheck

lamplit

•Enginewillnot

supplyrequested
fueltoengine

PossibleCause:

•Acceleratorpedalpositionharness

shortedhigh

•Faultyacceleratorpedalposition

sensor

•Acceleratorpedalpositionharness

shortedlow

•Faultyacceleratorpedalposition

sensor

•Lossofsensorsignal

•Faultyacceleratorpedalposition

sensor

•Faultyacceleratorpedalposition

sensor

•Lossofsensorground

•Acceleratorpedalpositionharness

MID144PID152VehicleECU,NumberofResets

Typeof
fault:

FMI12

FMIDescription:

•Faultymoduleor

component

FaultCondition:

•Internalsoftware

faultcausinga
reset

MID144PID191OutputShaftSpeed

Typeof
fault:

FMI5

FMI6

8

FMIDescription:

•Abnormallylow

currentoropen
circuit

•Abnormallyhigh

currentorshort
circuittoground

FaultCondition:

•Lowercurrentthen

expected

•Highercurrent

thenexpected

Possible
Symptoms:

PossibleCause:

•Systemrestarted•VECU

Possible
Symptoms:

PossibleCause:

•N/A•Faultyvehiclespeedsensor(VSS)

•Wiringharness

•N/A•Faultyvehiclespeedsensor(VSS)

•Wiringharness

Group36

MID144PPID3StarterrelayOutput

VehicleControlUnit,FaultTracing

Typeof
fault:

FMI3

FMIDescription:

•Voltageabove

normalorshorted
high

FaultCondition:

•Excessivecurrent

throughdrive
circuitry

MID144PPID60IdleValidationSwitch,Power

Typeof
fault:

FMI4

FMIDescription:

•Abnormallylow

voltageorshort
circuittolower
voltage

FaultCondition:

•Lowervoltage

thenexpected

MID144PPID69BufferedIdleValidationSwitch

Typeof
fault:

FMI3

FMI4

FMIDescription:

•Abnormallyhigh

voltageorshort
circuittohigher
voltage

•Abnormallylow

voltageorshort
circuittolower
voltage

FaultCondition:

•BufferedIVS1too

highcomparedto
IVS1signal

•BufferedIVS1too

lowcomparedto
IVS1signal

Possible
Symptoms:

PossibleCause:

•N/A•Shortinharnessordriverelays

Possible
Symptoms:

PossibleCause:

•N/A•Wiringharness

•VECU

•Defectiveidlevalidationswitch

•Lossofpowersupplytotheidle

validationswitch

Possible
Symptoms:

•Y ellowCheck

lamplit

•Y ellowCheck

lamplit

PossibleCause:

•Signalshortedhigh

•Faultyharness

•Signalshortedlow

•Faultyharness

MID144PPID70PedalSwitches,Supply

Typeof
fault:

FMI4

FMIDescription:

•Abnormallylow

voltageorshort
circuittolower
voltage

FaultCondition:

•Voltagebelow3V•Y ellowCheck

Possible
Symptoms:

PossibleCause:

•Faultyconnector

lamplit

•Faultyharness

•Supplyvoltageshortedlow

MID144PPID71CruiseControlandEngineBrake,SwitchSupply

Typeof
fault:

FMI4

FMIDescription:

•Abnormallylow

voltageorshort
circuittolower
voltage

FaultCondition:

•Voltagebelow3V•YellowChecklamp

Possible
Symptoms:

lit

•Enginewillnot

supplyrequested
fuelincrease

PossibleCause:

•Faultyconnector

•Faultyharness

•Supplyvoltageshortedlow

9

Group36

VehicleControlUnit,FaultTracing

MID144PPID72AcceleratorPedalandEngineBrake,SensorsSupply

Typeof
fault:

FMI3

FMIDescription:

•Abnormallyhigh

voltageorshort
circuittohigher
voltage

FaultCondition:

•Voltageabove

5.7V

Possible
Symptoms:

•Y ellowCheck

lamplit

•Requestedfuel

notsuppliedto
engine

•Enginebrake

retarderis
disabled

FMI4

•Abnormallylow

voltageorshort
circuittolower
voltage

•Voltagebelow

4.7V

•Y ellowCheck

lamplit

•Requestedfuel

notsuppliedto
engine

•Enginebrake

retarderis
disabled

MID144PPID73SecondAcceleratorPedal,SupplySensors

PossibleCause:

•Acceleratorpedalpositionsensor

harnessshortedhigh

•Acceleratorpedalpositionsensor

•Acceleratorpedalpositionsensor

harnessshortedlow

•Acceleratorpedalpositionsensor

Typeof
fault:

FMI3

FMI4

FMIDescription:

•Abnormallyhigh

voltageorshort
circuittohigher
voltage

•Abnormallylow

voltageorshort
circuittolower
voltage

FaultCondition:

•Voltageabove

5.3V

•Voltagebelow

4.7V

Possible
Symptoms:

•Y ellowCheck

lamplit

•Enginewillnot

supplyrequested
fueltoengine

•Displayshow

minimumwettank
pressure

•Y ellowCheck

lamplit

•Enginewillnot

supplyrequested
fueltoengine

•Displayshow

minimumwettank
pressure

PossibleCause:

•Signalshortedtohigh

•Faultyharness

•Faultytankairpressuresensor

•Signalshortedlow

•Faultyharness

•Faultytankairpressuresensor

10

Group36

MID144PPID74VehicleECU,PowerSupply

VehicleControlUnit,FaultTracing

Typeof
fault:

FMI4

FMIDescription:

•Abnormallylow

voltageorshort
circuittolower
voltage

FaultCondition:

•Voltagebelow

4.7V

MID144PPID265VehicleSpeedSensorSupply

Typeof
fault:

FMI3

FMI4

FMIDescription:

•Abnormallyhigh

voltageorshort
circuittohigher
voltage

•Abnormallylow

voltageorshort
circuittolower
voltage

FaultCondition:

•Voltageabove9V•Y ellowCheck

•Voltagebelow

6.5V

Possible
Symptoms:

•Y ellowCheck

lamplit

•Enginewillnot

supplyrequested
fueltoengine

•Displayshow

minimumwettank
pressure

Possible
Symptoms:

lamplit

•Y ellowCheck

lamplit

PossibleCause:

•Signalshortedlow

•Faultyharness

•Faultytankairpressuresensor

PossibleCause:

•VSSharnessshortedhigh

•FaultyVSS

•VSSharnessshortedlow

•FaultyVSS

MID144PPID279Airdryer,DryAgentReservoir

Typeof
fault:

FMI0

FMIDescription:

•Datavalid,but

abovethenormal
workingrange

FaultCondition:

•Airvolumetoo

highpumping
throughtheair
cartridge

MID144PPID312AirDryer,Regeneration

Typeof
fault:

FMI0

FMI7

FMIDescription:

•Datavalid,but

abovethenormal
workingrange

•Incorrectresponse

fromamechanical
system

FaultCondition:

•Airowusedisto

hightogettimeto
regenerate

•Valvehavebeen

openfor30
secondsandthe
pressureisstillthe
same

Possible
Symptoms:

•Y ellowCheck

lamplit

•Aircartridge

valvesmaybe
hardtohandle

Possible
Symptoms:

•Y ellowCheck

lamplit

•Reducedairpump

ability

•N/A•Faultyharness

PossibleCause:

•AirFilter

PossibleCause:

•AirFilter

•Plainairleakage

•ECS

•Valveblockstuckopen

•Airlter

11

Group36

MID144PPID430AirDryer,Regeneration

VehicleControlUnit,FaultTracing

Typeof
fault:

FMI0

FMIDescription:

•Datavalid,but

abovethenormal
workingrange

FaultCondition:

•Airowusedistoo

hightogettimeto
regenerate

Possible
Symptoms:

•Y ellowCheck

•Reducedairpump

MID144SID230IdleValidationSwitch1

Typeof
fault:

FMI7

FMIDescription:

•Incorrectresponse

FaultCondition:

•Faultyreadout

fromamechanical
system

fromIVS1

Possible
Symptoms:

•Y ellowCheck

•Enginewillnot

MID144SID231SAEJ1939DataLink

lamplit

ability

lamplit

supplyrequested
fueltoengine

PossibleCause:

•Airsuspensionregulatestoomuch

•Airleak

•AirFilter

PossibleCause:

•IdleV alidationSwitch(IVS)

•IVSconnector

•IVSharness

•Lossofgroundtotheacceleratorpedal

sensor

Typeof
fault:

FMI2

FMIDescription:

•Intermittentor

incorrectdata

FaultCondition:

•VECUdoesn’tget

acknowledgeon
sentmessages

MID144SID240ProgramMemory

Typeof
fault:

FMI2

FMIDescription:

•Intermittentor

incorrectdata

FaultCondition:

•Checksum

calculatedat
startupdiffersfrom
thestoredone

MID144SID243CruiseControlSetSwitch

Possible
Symptoms:

•Y ellowCheck

lamplit

Possible
Symptoms:

•Y ellowCheck

lamplit

•ECUkeeps

resetting

•Vehiclenot

drivable

PossibleCause:

•CANcommunication

•SAEJ1939datalinkdown/shorted

PossibleCause:

•Softwareerror

•Faultyashhardware

•VECU

12

Typeof
fault:

FMI7

FMIDescription:

•Incorrectresponse

FaultCondition:

•SignalsSET+and

fromamechanical
system

SET-receivedat
thesametime

Possible
Symptoms:

•Y ellowCheck

•Cruisecontrol

lamplit

deactivated

PossibleCause:

•Faultyharness

•Connector

Group36

MID144SID250SAEJ1587DataLink

VehicleControlUnit,FaultTracing

Typeof
fault:

FMI2

FMIDescription:

•Intermittentor

incorrectdata

FaultCondition:

•Faultymessages

onthelink
received

MID144SID253CalibrationMemoryEEPROM

Typeof
fault:

FMI2

FMI14

FMIDescription:

•Intermittentor

incorrectdata

FaultCondition:

•Datasets

haveincorrect
checksum

•Specialinstructions•Incorrectdata

foundindatasets

•Errorwhen

programming

Possible
Symptoms:

•Somefunction

disturbancesmay
occur

Possible
Symptoms:

•Y ellowCheck

lamplit

•Somefunctions

maybe
deactivated

•Y ellowCheck

lamplit

•Somefunctions

maybe
deactivated

PossibleCause:

•SAEJ1587datalinkdown/shorted

PossibleCause:

•FaultyEEPROM

•VECU

•FaultyEEPROM

•VECU

MID144PSID1RetarderControlSetSwitch

Typeof
fault:

FMI7

FMIDescription:

•Incorrectresponse

FaultCondition:

•SignalsSET+and

fromamechanical
system

SET-receivedat
thesametime

MID144PSID2IdleValidationSwitch2

Typeof
fault:

FMI7

FMIDescription:

•Incorrectresponse

FaultCondition:

•Faultyreadout

fromamechanical
system

fromIVS2

Possible
Symptoms:

•Y ellowCheck

lamplit

•RetarderControl

deactivated

Possible
Symptoms:

•Y ellowCheck

lamplit

•Enginewillnot

supplyrequested
fueltoengine

PossibleCause:

•Faultyharness

•Connector

PossibleCause:

•IdleV alidationSwitch(IVS)

•IVSconnector

•IVSharness

13

Group36

MID144PSID4EngineBrakeStalkLever

VehicleControlUnit,FaultTracing

Typeof
fault:

FMI3

FMI4

FMIDescription:

•Abnormallyhigh

voltageorshort
circuittohigher
voltage

•Abnormallylow

voltageorshort
circuittolower
voltage

FaultCondition:

•Voltageabove

4.8V

•Voltagebelow

0.2V

MID144PSID8NeutralPositionError

Typeof
fault:

FMI4

FMIDescription:

•Abnormallylow

voltageorshort
circuittolower
voltage

FaultCondition:

•Neutralinput

shortedhigh
orswitchstuck
closed

Possible
Symptoms:

•Y ellowCheck

lamplit

•Retarder

deactivated

•Y ellowCheck

lamplit

•Retarder

deactivated

Possible
Symptoms:

•N/A•Faultyharness

PossibleCause:

•Faultyharness

•Connector

•Faultyharness

•Connector

PossibleCause:

•Neutralswitch

MID144PSID14DataMaxGeneralError

Typeof
fault:

FMI9

FMIDescription:

•Abnormalupdate

rate

FaultCondition:

•ClockorOther

datamissing

MID144PSID16PowerRelay1

Typeof
fault:

FMI3

FMI4

FMIDescription:

•Abnormallyhigh

voltageorshort
circuittohigher
voltage

•Abnormallylow

voltageorshort
circuittolower
voltage

FaultCondition:

•Powerrelay1

outputshortedto
battery

•Powerrelay1

outputshortedto
ground

Possible
Symptoms:

•N/A•N/A

Possible
Symptoms:

•N/A•Faultyharness

•N/A•Faultyharness

PossibleCause:

PossibleCause:

•EMSpowerrelay

•EMSpowerrelay

14

Group36

MID144PSID17PowerRelay2

VehicleControlUnit,FaultTracing

Typeof
fault:

FMI3

FMI4

FMIDescription:

•Abnormallyhigh

voltageorshort
circuittohigher
voltage

•Abnormallylow

voltageorshort
circuittolower
voltage

FaultCondition:

•Powerrelay2

outputshortedto
battery

•Powerrelay1

outputshortedto
ground

MID144PSID20PowerT ake-offSignal

Typeof
fault:

FMI3

FMI4

FMIDescription:

•Abnormallyhigh

voltageorshort
circuittohigher
voltage

•Abnormallylow

voltageorshort
circuittolower
voltage

FaultCondition:

•Voltagetoohigh•Y ellowCheck

•Voltagebelow

2.3V

Possible
Symptoms:

•N/A•Faultyharness

•N/A•Faultyharness

Possible
Symptoms:

lamplit

•Y ellowCheck

lamplit

PossibleCause:

•EMSpowerrelay

•EMSpowerrelay

PossibleCause:

•Circuitshortedhigh

•FaultyHarness

•FaultyValve

•Circuitshortedlow

•FaultyHarness

•FaultyValve

MID144PSID23AirDryer,Regenerating

Typeof
fault:

FMI3

FMI4

FMIDescription:

•Abnormallyhigh

voltageorshort
circuittohigher
voltage

•Abnormallylow

voltageorshort
circuittolower
voltage

FaultCondition:

•Voltagetoohigh•Y ellowCheck

•Voltagebelow

MID144PSID24Compressor,Control

Typeof
fault:

FMI3

FMI4

FMIDescription:

•Abnormallyhigh

voltageorshort
circuittohigher
voltage

•Abnormallylow

voltageorshort

FaultCondition:

•Voltagetoohigh•Y ellowCheck

•Voltagebelow

Possible
Symptoms:

PossibleCause:

•Signalshortedlow

lamplit

•Y ellowCheck

2.3V

lamplit

Possible
Symptoms:

•Faultyvalve

•Signalshortedhigh

•Faultyvalve

PossibleCause:

•Signalshortedlow

lamplit

•Y ellowCheck

2.3V

lamplit

•Faultyvalve

•Signalshortedhigh

15

Group36

VehicleControlUnit,FaultTracing

circuittolower
voltage

•Faultyvalve

MID144PSID25AirLeakage

Typeof
fault:

FMI14

FMIDescription:

•Datavalid,butbelow

thenormalworking
range

FaultCondition:

•AIrowtoohigh

(atvelocityabove
50km/h)

Possible
Symptoms:

•SmallLeakage-

Infolamplit

•LargeLeakage-

Servicelamplit

PossibleCause:

•Airleakage

MID144PSID200CommunicationInterference,DataLink,EngineControl
Module(ECM)

Typeof
fault:

FMI9

FMIDescription:

•Abnormalupdate

rate

FaultCondition:

•ExpectedEMS

message/snot
received

Possible
Symptoms:

•Y ellowCheck

lamplit

PossibleCause:

•CAN1CommunicationDown

•SAEJ1939datalinkDown/Shorted

•Inconsistentormismatchof

congurationbetweenVECU
andEngineControlModule(ECM)

MID144PSID202CommunicationInterference,DataLink,Instrumentation

Typeof
fault:

FMI9

FMIDescription:

•Abnormalupdate

rate

FaultCondition:

•ExpectedCluster

message/snot
received

Possible
Symptoms:

•Y ellowCheck

lamplit

PossibleCause:

•CAN1CommunicationDown

•SAEJ1939datalinkDown/Shorted

MID144PSID204CommunicationInterference,DataLink,BrakeControl
Module

Typeof
fault:

FMI9

FMIDescription:

•Abnormalupdate

rate

FaultCondition:

•ExpectedABS

message/snot
received

Possible
Symptoms:

•Y ellowCheck

lamplit

PossibleCause:

•CAN1CommunicationDown

•SAEJ1939datalinkDown/Shorted

•VECUisconguredtoreceiveJ1939

HRWmessage(HighResolution
WheelSpeed)fromABSbutisn’t
receivingit

16

Group36

MID144PSID205CommunicationInterference,DataLink,Transmission
ControlModule

VehicleControlUnit,FaultTracing

Typeof
fault:

FMI9

FMIDescription:

•Abnormalupdate

rate

FaultCondition:

•ExpectedTECU

message/snot
received

Possible
Symptoms:

•Y ellowCheck

lamplit

PossibleCause:

•CAN1CommunicationDown

•SAEJ1939datalinkDown/Shorted

MID144PSID206CommunicationInterference,DataLink,RetarderControl
Module

Typeof
fault:

FMI9

FMIDescription:

•Abnormalupdate

rate

FaultCondition:

•Expected

ECCU—retarder
message/snot
received

Possible
Symptoms:

•Y ellowCheck

lamplit

PossibleCause:

•CAN1CommunicationDown

•SAEJ1939datalinkDown/Shorted

MID144PSID207CommunicationInterference,DataLink,GearSelector
ControlModule

Typeof
fault:

FMI9

FMIDescription:

•Abnormalupdate

rate

FaultCondition:

•ExpectedGSECU

message/snot
received

Possible
Symptoms:

•Y ellowCheck

lamplit

PossibleCause:

•CAN1CommunicationDown

•SAEJ1939datalinkDown/Shorted

MID144PSID208CommunicationInterference,DataLink,AirSuspension

Typeof
fault:

FMI9

FMIDescription:

•Abnormalupdate

rate

FaultCondition:

•ExpectedECS

message/snot
received

Possible
Symptoms:

•Y ellowCheck

lamplit

PossibleCause:

•CAN1CommunicationDown

•SAEJ1939datalinkDown/Shorted

MID144PSID210SAEJ1939DataLinkInterruption,LightingControl
Module(LCM)

Typeof
fault:

FMI9

FMIDescription:

•Abnormalupdate

rate

FaultCondition:

•ExpectedLCM

message/snot
received

Possible
Symptoms:

•Y ellowCheck

lamplit

PossibleCause:

•CAN1CommunicationDown

•SAEJ1939datalinkDown/Shorted

17

Group36

VehicleControlUnit,FaultTracing

MID144PSID211SAEJ1939DataLinkInterruption,CollisionAvoidance
ControlModule

Typeof
fault:

FMI9

FMIDescription:

•Abnormalupdate

rate

FaultCondition:

•ExpectedACC

message/snot
received

Possible
Symptoms:

•Y ellowCheck

lamplit

MID144PSID214DataLink,BodybuilderControlModule

Typeof
fault:

FMI9

FMIDescription:

•Abnormalupdate

rate

FaultCondition:

•ExpectedBBM

message/snot
received

Possible
Symptoms:

•Y ellowCheck

lamplit

MID144PSID230SoftwareFault

Typeof
fault:

FMI4

FMI5

FMI12

FMIDescription:

•Abnormallylow

voltageorshort
circuittolower
voltage

•Abnormallylow

currentoropen
circuit

•Faultymoduleor

component

FaultCondition:

•Uncontrolledreset

ofSW

•Softwarehas

beenshutdown
becausevoltage
toolow

•Severeerrorreset

theSoftware

Possible
Symptoms:

•Y ellowCheck

lamplit

•N/A•Wiringharness(lossorinterruptionof

•Y ellowCheck

lamplit

PossibleCause:

•CAN1CommunicationDown

•SAEJ1939datalinkeDown/Shorted

PossibleCause:

•CAN1CommunicationDown

•SAEJ1939datalinkDown/Shorted

PossibleCause:

•Wiringharness(lossorinterruptionof

supplyvoltage)

•Faultysoftware

•VECU

supplyvoltage)

•Faultysoftware

•VECU

18

19

Lastpage

PV776-88951780(USA)1.2010©MackTrucks,Inc.,2010

MackTrucks,Inc.

Greensboro,NCUSA

http://www.macktrucks.com