Troubleshooting

Table 18
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. Check specifically for codes
that relate to the “Probable Causes” in this procedure.
Diagnostic
codes
Result: A diagnostic trouble code is active or logged.
Repair: Troubleshoot any related diagnostic codes before
continuing with this procedure.
Result: A related 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. Individual Malfunctioning Cylinders
If the engine will run, perform the following steps.
A. With the engine speed at a fast idle, use the electronic service
tool to perform the manual “Cylinder Cut Out Test” . As each cylin-
der is cut out, listen for a change in the sound from the engine.
When a cylinder is cut out, there should be a noticeable change in
the sound of the engine.
Insulation Result: There is not a noticeable change in the sound of
the engine for at least one cylinder.
Repair: Investigate the cause of the fault on any cylinder
that is not operating. Investigate the cause of the fault on
any cylinder that is operating below normal performance.
When all faults have been rectified, proceed to Test Step 4.
Result: There is a noticeable change in the sound of the
engine for each cylinder.
Proceed to Test Step 4.
(continued)
52 UENR0612-07
Symptom Troubleshooting
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