Navistar MaxxForce 7

SECTION1–ENGINESYSTEMS
EngineFeatures(cont.)
ElectronicServiceTool(EST)Interface
VehiclesareequippedwiththeESTinterfaceforcommunication
betweentheEngineControlModule(ECM)andtheEST .
CANisaJ1939serialbussystem,alsoknowastheDrivetrain
Datalink.ThepublicControllerAreaNetwork(CAN)providesa
communicationlinkbetweenallconnectingmodulesbysending
andreceivingmessages.
TheESTwithServiceMaxx™softwarecommunicateswiththe
ECMthroughtheESTinterface.TheEST ,throughthepublic
CAN,isabletoretrieveDiagnosticTroubleCodes(DTCs),run
diagnostictests,andviewParameterIdentiers(PIDs)fromall
inputsandoutputsoftheECM.
CANpublicsupportsthefollowingfunctions:
•Transmissionofengineparameterdata
•TransmissionandclearingofDTCs
•Diagnosticsandtroubleshooting
•Programmingperformanceparametervalues
•Programmingengineandvehiclefeatures
•ProgrammingcalibrationsandstrategiesintheECM
ElectronicSpeedometerandTachometer
Theenginecontrolsystemcalibratesvehiclespeed.Anynew
speedcalibrationinformationmustbeprogrammedwithanEST.
ThetachometersignalisgeneratedbytheECMbycomputing
signalsfortheCamshaftposition(CMP)sensorandCrankshaft
Position(CKP)sensor.
EngineCrankInhibit(ECI)
ECIpreventsstarterengagementwhentheengineisrunningor
whenthetransmissionisingear.
EngineWarningProtectionSystem(EWPS)
EWPSisdesignedtoprotecttheenginefromdamage
bymonitoringcriticalenginedatasuchasenginespeed,
temperature,oilpressureandcoolantlevels.Thisfeaturewill
alerttheoperatorbyusingacombinationofvisualandaudible
warningswhencriticalengineparametershavebeenexceeded.
ForfurtherinformationseeEngineWarningProtectionSystem
EWPS(page59).
EventLoggingSystem
Theeventloggingsystem,knownasTripReporting,records
engineoperationabovemaximumrpm(overspeed),high
coolanttemperature,orlowoilpressure.Thereadingsforthe
odometerandhourmeterarestoredintheECMmemoryatthe
timeofaneventandcanberetrievedusingtheEST.
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