Table 20
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 an ac-
tive 3251-3 or 3251-4 diagnostic code.
Diagnostic
codes
Result:
A 3251-3 or 3251-4 diagnostic code is active
Refer to Troubleshooting, “Sensor Signal (Analog, Active) -
Test” before returning to this procedure.
Result:
A related diagnostic trouble code is not active or
logged.
Proceed to Test Step 2.
2. Exhaust Leaks
A. Thoroughly inspect the exhaust duct between the engine and the
DPF for leaks. Ensure that all connections are secure and no leaks
are present.
Exhaust leaks
Result:
There are leaks in the exhaust system.
Make any necessary repairs.
Result:
The exhaust system is OK.
Proceed to Test Step 3.
Illustration 19
g02726855
Typical view of the DPF differential pressure sensor
(1) Connection to the DPF inlet
(2) Connection to the DPF outlet
UENR0612
53
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