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.