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VMAC IV 144
User Manual
22 pgs671.87 Kb2

MACK VMAC IV 144 User Manual

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Page 1
ServiceManual
VehicleElectronicControlUnit(MID144),DiagnosticTrouble
Code(DTC),Guide
Frombuilddate1.2007
Trucks
Group36
PV776-88951780
Page 2
Foreword
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
Page 3
Contents
DesignandFunction....................................................................................................................3
MID144VehicleControlUnit.......................................................................................................3
Troubleshooting..........................................................................................................................4
VehicleControlUnit,FaultTracing................................................................................................4
1
Page 4
2
Page 5
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
Page 6
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
Page 7
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
Page 8
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
Page 9
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
Page 10
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
Page 11
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
Page 12
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
Page 13
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
Page 14
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
Page 15
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
Page 16
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
Page 17
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
Page 18
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
Page 19
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
Page 20
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
Page 21
19
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Lastpage
PV776-88951780(USA)1.2010©MackTrucks,Inc.,2010
MackTrucks,Inc.
Greensboro,NCUSA
http://www.macktrucks.com
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