Troubleshooting
Table 22
Troubleshooting Test Steps
Values Results
1. Diagnostic Codes
A. Establish communication between the electronic service tool
and the Electronic Control Module (ECM).
B. Check for active diagnostic codes.
Codes Result: A diagnostic trouble code is active or logged.
Repair: Troubleshoot any diagnostic codes before con-
tinuing with this procedure.
Result: A diagnostic trouble code is not active or logged.
Proceed to Test Step 2.
2. Incorrect Wiring for Temperature Sensors
A. Check that the Diesel Oxidation Catalyst (DOC) inlet tempera-
ture sensor and DPF inlet temperature sensor wiring has not been
switched.
Note: The engine may run without indicating a fault for many hours
with this condition.
B. Check that the wiring for the DOC inlet temperature and the
DPF inlet temperature sensor is connected to the correct ECM
pins.
Refer to the Electrical Schematic for the application.
Wiring Result: The wiring for the DOC inlet temperature sensor
or the DPF inlet temperature sensor is incorrect.
Repair: Repair the faulty wiring or replace the faulty
wiring.
Result: The wiring for the DOC inlet temperature sensor
and the DPF inlet temperature sensor is OK.
Proceed to Test Step 3.
3. Insulation on the Exhaust Duct (If Equipped)
A. Check the insulation on the exhaust duct between the engine
and the Clean Emissions Module (CEM). Make sure that insulation
is not missing or damaged.
Insulation Result: The insulation is missing or damaged.
Repair: Repair or replace the insulation on the exhaust
duct.
Result: The insulation is OK.
Proceed to Test Step 4.
4. Exhaust Leaks
A. Thoroughly inspect the exhaust duct between the engine and
the CEM for leaks. Ensure that all connections are secure and no
leaks are present.
Exhaust leaks Result: There are exhaust leaks.
Repair: Make the necessary repairs, Verify that the repair
has eliminated the fault.
Result: The exhaust duct is OK.
Proceed to Test Step 5.
5. Wastegate
A. Check for correct operation of the wastegate. Refer to Systems
Operation, Testing, and Adjusting, “Turbocharger - Inspect”.
Wastegate Result: The wastegate or the wastegate actuator is faulty.
Repair: Install a replacement turbocharger. Refer to Disas-
sembly and Assembly, “Turbocharger - Remove” and Dis-
assembly and Assembly, “Turbocharger - Install”.
Result: The wastegate and the wastegate actuator are
OK.
Contact the Dealer Solution Network (DSN).
UENR0612-07
57
Symptom Troubleshooting
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