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