Troubleshooting

(Table 18, contd)
Troubleshooting Test Steps
Values Results
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.
B. Inspect the insulation on the exhaust duct (if equipped) for
damage.
Exhaust leaks Result: There are exhaust leaks. The insulation is
damaged.
Repair: Make the necessary repairs. Proceed to Test Step
5.
Result: The exhaust duct is OK.
Proceed to Test Step 5.
5. Manual Regeneration
A. If a 3251-16 or 3719-16 diagnostic code was active, use the
electronic service tool to perform a “Particulate Filter Forced Re-
generation” . Make sure that the high soot loading diagnostic trou-
ble code is no longer active.
B. If a 3251-0 or 3719-0 diagnostic code was active, the DPF must
be replaced. Refer to Disassembly and Assembly, “Diesel Particu-
late Filter - Remove” and refer to Disassembly and Assembly, “Die-
sel Particulate Filter - Install”. Use the electronic service tool to
perform the “DPF Replacement Reset” .
Complete
regeneration
Result: The regeneration completed successfully and
there are no active diagnostic codes.
Return the engine to service.
Result: The regeneration did not complete successfully.
Contact the Dealer Solution Network (DSN).
i05995809
Diesel Particulate Filter Has
Differential Pressure Problem
Note: This procedure is only applicable to engines
equipped with a wall flow Diesel Particulate Filter
(DPF) and a DPF differential pressure sensor.
This procedure covers the following diagnostic
codes:
Table 19
Diagnostic Trouble Codes for the DPF Differential Pressure
J1939 Code
Description
Notes
3251-7 Particulate Trap Differential Pressure : Not Responding
Properly
The Electronic Control Module (ECM) detects the following
conditions:
The measured differential pressure from the DPF differential
pressure sensor is invalid.
The battery voltage is at least 10 VDC.
This fault can be caused by damaged or blocked pipes to the
DPF differential pressure sensor.
If equipped, the warning lamp will come on. The engine will be
derated.
(continued)
UENR0612-07 53
Symptom Troubleshooting
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