Troubleshooting

Table 21
Troubleshooting Test Steps
Values Results
3. Connections to the DPF Differential Pressure Sensor
A. Thoroughly inspect the following components for blockages
and/or damage:
· Connection (1) on the DPF differential pressure sensor
· Connection (2) on the DPF differential pressure sensor
· The pipes between the DPF differential pressure sensor and the
DPF
· The pipe connections on the DPF for the differential pressure
sensor
Damage and/
or blockages
Result: One of the connections is damaged and/or
blocked
Replace any damaged or blocked components.
Result: All connections are OK.
Proceed to Test Step 4.
4. Incorrect Installation of the DPF
A. Check that the DPF is installed correctly. Refer to Disassembly
and Assembly, “Diesel Particulate Filter - Install” for the correct in-
stallation method for the DPF.
DPF Result: The DPF is not installed correctly.
Remove the DPF and install the DPF correctly. Refer to
Disassembly and Assembly, “Diesel Particulate Filter - Re-
move” andDisassembly and Assembly, “Diesel Particulate
Filter - Install”.
Result: The DPF is installed correctly.
Install a replacement DPF differential pressure sensor.
Run the engine and use the electronic service tool to check
for active 3251 diagnostic codes.
If the fault has not been eliminated, contact the Dealer Sol-
ution Network (DSN).
i06092634
Diesel Particulate Filter
Temperature Is Low
The Electronic Control Module (ECM) monitors the
temperature at the intake of the Diesel Particulate
Filter (DPF).
Probable Causes
• Diagnostic codes
• Incorrect wiring for temperature sensors
• Insulation on the exhaust duct (if equipped)
• Exhaust leaks
• Wastegate
Recommended Actions
Note: The procedures have been listed in order of
probability. Complete the procedures in order.
56 UENR0612-07
Symptom Troubleshooting
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