Troubleshooting

Table 14
Troubleshooting Test Steps
Values Results
1. 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 insula-
tion is not missing or damaged.
Codes Result: The insulation is missing or damaged.
Repair: Repair or replace the insulation.
Result: The insulation is OK.
Proceed to Test Step 2.
2. Diagnostic Codes
A. Connect the electronic service tool to the diagnostic
connector.
B. Check for active diagnostic codes.
C. Use the electronic service tool to perform a service
regeneration.
D. Check for active diagnostic codes on the electronic service
tool.
Diagnostic codes Result: There are active diagnostic codes.
Repair: Investigate any active codes before continuing
with this procedure. Refer to Troubleshooting, “Diagnostic
Trouble Codes”.
Result: There are no active diagnostic codes.
Proceed to Test Step 3.
3. 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 4.
4. Maintenance Schedule
A. Check the maintenance schedule for the DPF. Refer to the
Operation and Maintenance Manual, “Maintenance Interval
Schedule”.
Maintenance
schedule
Result: The DPF is due for an ash service.
Repair: Perform an ash service. Refer to the Operation
and Maintenance Manual, “Diesel Particulate Filter -
Clean”.
Result: The DPF is not due for an ash service.
Proceed to Test Step 5.
(continued)
48 UENR0612-07
Symptom Troubleshooting
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