Troubleshooting

(Table 19, contd)
3251-10 Particulate Trap Differential Pressure : Abnormal Rate of
Change
The ECM detects the following conditions:
The differential pressure across the DPF does not drop below
2.5 kPa (0.36 psi) after the engine has stopped.
This code will be active when the defect has been detected for
at least 6 seconds.
The battery voltage is at least 10 VDC.
If equipped, the warning lamp will come on. The engine will be
derated.
3251-17 Particulate Trap Differential Pressure : Low - least severe (1) The ECM detects the following conditions:
There is no differential pressure across the DPF for at least 100
seconds.
The battery voltage is at least 10 VDC.
The engine will be derated.
The fault will be cleared if the differential pressure is within the
acceptable range for at least 10 seconds.
3251-18 Particulate Trap Differential Pressure : Low - moderate severity
(2)
The Electronic Control Module (ECM) uses the
Diesel Particulate Filter (DPF) differential pressure
sensor to monitor the soot load in the DPF. An
excessive accumulation of soot in the DPF can be
caused by the following faults:
Probable Causes
• Diagnostic codes
• Exhaust leaks
• Connections to the DPF differential pressure
sensor
• Incorrect installation of the DPF
• Faulty DPF differential pressure sensor
Recommended Actions
Note: The procedures have been listed in order of
probability. Complete the procedures in order.
54 UENR0612-07
Symptom Troubleshooting
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