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Detroit DD15 EPA07 (2007-09) Fault Code: SPN 3251 FMI 1 (MCM) Diesel Particulate Filter Pressure Out of Range Low

DESCRIPTION:
DPF pressure out of range low.

MONITORED PARAMETER:
1. DPF inlet pressure sensor.
2. DPF outlet pressure sensor.

TYPICAL ENABLING CONDITIONS:
Always on

MONITOR SEQUENCE:
None

EXECUTION FREQUENCY:
Continuous when enabling conditions met.

TYPICAL DURATION:
Two seconds

DASH LAMPS:
1. MIL
2. CEL
3. SEL

ENGINE REACTION:
Derate 25%

VERIFICATION:
Run engine between 1500 to 1900 rpm with a load less than 80%.

PROBABLE CAUSES:
1. Inspect DPF outlet pressure hose for leaks/kinks/plugging.
2. Inspect electrical connections upstream of the MCM (sensor, ATD 10-pin connector, VIH 31-pin connector, MCM 120-pin connector).
3. Remove the DPF and inspect for signs of oil, fuel, or soot contamination. If found, find source.
4. DPF failure.
5. Performed parked regen.

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