7 ELECTRONIC CONTROL SYSTEMS DIAGNOSTICS 375
DTC 543
ECM / IDM communications fault
• DTC 543 is set by the ECM when the ECM is not
communicating with the IDM.
• DTC 543 can be set w hen C AN 2 datalink J1939
between ECM and IDM is shorted to ground, V
REF
,
or battery or the circuit is open. If IDM power is
low, DTC 543 can b e set.
• When DTC 543 is active the amber ENGINE lamp
is illuminate d.
NOTE: IfanostartconditionexistswithDTC543and
368 active, check the CAN 2 datalink wiring (EGR to
ECM and IDM to ECM). See “EGR Actuator” (page
413) in this section. One of the CAN 2 datalink wires
(CAN 2 positive or negative) is open, short to ground,
or a short to power exists.
DTC 551
IDM / CMPO signal inactive
• DTC 551 is set by the ECM when no CMPO signal
is present while the CKPO is active. DTC 55 1
can also be set when no CMPO/CKPO is present
while the ECM reports it is in the run mode.
• DTC 551 can be s et when the CMPO is open,
shorted to ground, or shorted to a voltage source.
DTC 551 can also be se t if logic po w e r is low.
DTC 552
IDM incorrect CMPO signal signature
• DTC 552 is set when the CMPO transition occurs
at the wrong CKPO tooth.
• DTC 552 can be set due to electrical noise
creating a mis countonCMPlocation.
DTC 553
IDM / CKPO signal inactive
• DTC 553 is set by the ECM when no CKPO signal
is present while the CMPO is active. DTC 552
canalsobesetwhennoCMPO/CKPOispresent
while the ECM reports it is in the run mode.
• DTC 553 can be set when CKPO is open, shorted
to ground, or shorted to a voltage source. DTC
553 c an also be set if logic power is low.
DTC 554
IDM incorrect CKPO signal signature
• DTC 554 is set by the ECM when CKPO signal
has too few or too many transitions per engine
rotation .
• DTC 554 can be set due to electrical noise
creating a m iscount on CKP location.
Tools
• EST with MasterDiagnostics® software
• EZ-Tech® interface cable
• Digital Multimeter (DMM)
• Breakout Box
• Terminal Te st Adapter Kit
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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