User Manual

Group28
EngineControlModule(ECM)DiagnosticTrouble
Codes(DTCs)
SystemElectronicControlUnit(ECU)Overview
Theenginecontrolmodule(ECM)monitorsandmodels(using
physicalprinciples)engineparameterstomonitortheengine
system’sperformanceinrealtime.Thisisperformedtoaidthe
ECMwithitsselfdiagnosticcapabilities.Manysensorsare
usedforinputtotheemissioncontrolsystem.
Thesystemcontainsthefollowing“emissioncritical”ECUs
thataremonitored;
•EngineControlModule(ECM)
•VehicleElectronicControlUnit(VECU)
•AftertreatmentControlModule(ACM)
•AftertreatmentNitrogenOxides(NOx)Sensors
•EngineVariableGeometryTurbocharger(VGT)Smart
RemoteActuator(SRA)
TheseECUsallcommunicatewiththeECMviadatalinks.The
VECUcommunicatesacrosstheSAEJ1939(CAN1)datalink
whiletheothersusetheSAEJ1939-7(CAN2)datalink.
TheOBDsystemsuseSAEJ1939datalinkprotocolfor
communicationwithscantoolsbut,MACKtrucksstillare
capableofcommunicatingviatheSAEJ1587datalinkfor
diagnostics.Theuseofascantoolisnecessarytoperform
diagnosticworkaswellasclearingofanydiagnostictrouble
codes(DTCs).DTC(s)cannolongerbeclearedusingthe
vehiclesinstrumentclusterdigitaldisplayandstalkswitch
control.
ThereareotherECUssuchastheInstrumentControlModule
(ICM),TransmissionControlModule(TCM)andAnti-lock
BrakeSystem(ABS)Modulethatprovidedatatotheemission
controlsystemorthediagnosticsystembutarenot“emission
critical”.
MalfunctionIndicatorLamp(MIL),DescriptionandLocation
AMILlocatedintheinstrumentcluster.Thisambercolored
lampisusedtoinformthedriverthata“emissioncritical”
malfunctionsignalhasoccurred.
W2036007
SAEJ1939DataLinkCommunication
Theelectroniccontrolunits(ECUs)thatcommunicateonthe
SAEJ1939datalink,communicateaccordingtotheSAE
J1587standard.Thediagnostictroublecodes(DTCs)setby
theECUscontaininformationthatisdescribedbythefollowing
abbreviations.
SASourceAddress:
Identicationofacontrolmodule.
SPNSuspectParameterNumber:
Identicationofaparameter(value).
FMIFailureModeIdentier:
Identicationoffaulttypes.
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