Cummins ISM CM870 (2003-06) Fault Code: 256 PID: P171 SPN: 171 FMI: 4/4 Ambient Air Temperature Sensor 1 Circuit - Voltage Below Normal or Shorted to Low Source. Low voltage detected at ambient air temperature circuit.

Possible causes:

1)Signal shorted to ground in the harness
2)Signal shorted to return or ground in the sensor.

Possible repair:

1)Replace the OEM harness.
2)Replace the ambient air temperature sensor.
3)Replace the ECM.

Cummins ISM CM870 (2003-06) Fault Code: 255 PID: S071 SPN: 632 FMI: 3/3 Engine Fuel Shutoff Valve Drive Circuit - Voltage Above Normal or Shorted to High Source. Open circuit or short to voltage source detected at fuel shutoff valve circuit.

Cummins ISM CM870 (2003-06) Fault Code: 254 PID: S017 SPN: 632 FMI: 4/4 Fuel Shutoff Valve Circuit - Shorted Low. Low voltage detected at fuel shutoff valve circuit.

Cummins ISM CM870 (2003-06) Fault Code: 249 PID: P171 SPN: 171 FMI: 3/3 Ambient Air Temperature Sensor 1 Circuit - Voltage Above Normal or Shorted to High Source. High signal voltage detected at ambient air temperature circuit.

Cummins ISM CM870 (2003-06) Fault Code: 245 PID: S033 SPN: 647 FMI: 4/4 Fan Control Circuit - Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the fan control circuit when commanded ON.

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