Navistar MaxxForce 9

DIAGNOSTICMANUAL
Actions:
1.WhenEGRvalveiscommandedON,verifyIntakeManifoldPressure(IMP)signalvaluedrops.
2.WhenEGRvalveiscommandedON,verifyMassAirFlow(MAF)MeanValue(MMV)drops.
CalculatethedifferencebetweenMMVatastabilizedhighpointandastabilizedlowpoint,then
comparetothetablebelow.
Engine
MAFMeanValue(MMV)
Difference
Tolerance
MaxxForce®DT
215-230HP
690–1000
Lessthan690FailsAMST est
MaxxForce®DT
245-300HP
740–1000
Lessthan740FailsAMST est
MaxxForce®9and10
300-350HP
850–1130
Lessthan850FailsAMST est
NOTE–EGRvalvepositionwillneverreadlessthan35%andisconsideredclosed.
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