Navistar N10

441DIAGNOSTICTROUBLESHOOTINGPROCEDURES
Step
3
DetermineifESTcommunicateswithothermodules.Decision
A.Key-OnEngine-Off(KOEO)
B.ConnectESTwithServiceMaxx™toinitialvehicleandlogin.
C.UndertheConnection(Sniffer)tabverifyequippedmodulesarelisted
underModuleNameandCountisactivelychanging.
DoesESTcommunicatewithmodulesotherthantheEngineControlModule
(ECM)?
Yes:GotoStep4
No:GotoStep15
CAUTION:AlwaysusethelatestversionofN9andN10EngineandAftertreatmentWiringSchematicForm
0000003481.Failuretocomplywillcausemisdiagnosisandunnecessaryrepairs.
Step
4
DetermineifEngineControlModule(ECM)groundcircuitsareworking
properly.
Decision
A.KeyOff
B.ConnectBreakoutHarness00-00959-01toECM76-pingraychassis
connectorandECM.
C.ConnectBreakoutHarness00-00959-01to180-pinBreakoutBox
00-00956-08.
D.Key-OnEngine-Off(KOEO)
E.MeasurevoltagebetweenbatterypositiveandpinsC-2,4,and6.
AreECMgroundcircuitsbetweenpinsC-2,4,6andbatterypositivewithin0.5V
ofbatteryvoltage?
Yes:GotoStep5
No:Repairgroundcircuits.After
repairsarecomplete,retestfor
originalproblem.
Step
5
DetermineifECMisreceivingignitionswitchpower.Decision
A.Key-OnEngine-Off(KOEO)
B.MeasureSWBATcircuitvoltagebetweenbatterygroundandpinC-31.
IsvoltagebetweenpinC-31andbatterynegativewithin0.5Vofbatteryvoltage?
Yes:GotoStep7
No:GotoStep6