Cummins ISM CM870 (2003-06) Fault Code: 284 PID: S221 SPN: 1043 FMI: 4/4 Engine Speed Sensor Supply Voltage Circuit - shorted low. Incorrect voltage detected on the ECM voltage supply line to the engine speed sensor.

The ECM monitors the voltage level on the engine speed sensor +5 volt supply circuit. If voltage falls below a calibratible limit then this fault is recorded.

Possible causes:

1) A short circuit to ground in the engine harness, sensor, or ECM.

Possible repairs:

1)Replace the engine speed sensor.
2)Replace the ECM.
3)Replace the engine harness.

Cummins ISM CM870 (2003-06) Fault Code: 265 PID: P174 SPN: 174 FMI: 4/4 Engine Fuel Temperature Sensor Circuit - Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at engine fuel temperature circuit.

Cummins ISM CM870 (2003-06) Fault Code: 263 PID: P174 SPN: 174 FMI: 3/3 Engine Fuel Temperature Sensor Circuit - Voltage Above Normal or Shorted to High Source. High signal voltage detected at engine fuel temperature circuit.

Cummins ISM CM870 (2003-06) Fault Code: 259 PID: S017 SPN: 632 FMI: 7/7 The ECM detected that the fuel shutoff valve is stuck open mechanically or leaking.

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.

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