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Cummins ISX CM870 (2003-06) Fault Code: 145 PID: P110 SPN: 110 FMI: 4/4 Engine Coolant Temperature 1 Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at engine coolant temperature circuit.

The engine coolant temperature sensor shares return wires in the engine harness with other sensors. A shorted return can cause multiple fault codes to be active. Before troubleshooting Fault Code 145, check for multiple fault codes.

Possible causes:

1)Signal shorted to ground in the harness2)Signal shorted to return or ground in the sensor.

Possible repair:

1)Replace the ECM2)Repair or replace the engine harness.3)Replace the engine coolant temperature sensor.

Cummins ISX CM870 (2003-06) Fault Code: 144 PID: P110 SPN: 110 FMI: 3/3 Engine Coolant Temperature 1 Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage or open circuit detected at engine coolant temperature circuit.
Cummins ISX CM870 (2003-06) Fault Code: 143 PID: P100 SPN: 100 FMI: 1/18 Engine Oil Rifle Pressure – Data Valid But Below Normal Operating Range – Moderately Severe Level. Engine oil pressure signal indicates engine oil pressure is below the engine protection warning limit.
Cummins ISX CM870 (2003-06) Fault Code: 141 PID: P100 SPN: 100 FMI: 4/4 Engine Oil Rifle Pressure 1 Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage or open circuit detected at the engine oil pressure circuit.
Cummins ISX CM870 (2003-06) Fault Code: 135 PID: P100 SPN: 100 FMI: 3/3 Engine Oil Rifle Pressure 1 Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the engine oil pressure circuit.
Cummins ISX CM870 (2003-06) Fault Code: 134 PID: P029 SPN: 974 FMI: 4/4 Remote Accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at remote accelerator position signal circuit.
Cummins ISX CM870 (2003-06) Fault Code: 133 PID: P029 SPN: 974 FMI: 3/3 Remote Accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at remote accelerator position signal circuit.