The engine oil temperature sensor shares return wires in the engine harness with other sensors. An open return can cause multiple fault codes to be active.
Possible causes:
1)Open return circuit in the harness, connectors, or sensor.2)Open signal circuit or shorted to a voltage source.
Possible repairs:
1)Replace the engine oil temperature sensor.2)Repair or replace the engine harness.3)Replace the ECM.
Cummins ISX CM870 (2003-06) Fault Code: 197 PID: P111 SPN: 111 FMI: 1/18 Coolant Level – Data Valid But Below Normal Operating Range – Moderately Severe Level. Low engine coolant level detected.
Cummins ISX CM870 (2003-06) Fault Code: 196 (3 wire) PID: P111 SPN: 111 FMI: 4/4 Coolant Level Sensor 1 Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the engine coolant level circuit.
Cummins ISX CM870 (2003-06) Fault Code: 196 (2 wire) PID: P111 SPN: 111 FMI: 4/4 Coolant Level Sensor 1 Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at the engine coolant level circuit.
Cummins ISX CM870 (2003-06) Fault Code: 195 (3 wire) PID: P111 SPN: 111 FMI: 3/3 Coolant Level Sensor 1 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the engine coolant level circuit
Cummins ISX CM870 (2003-06) Fault Code: 195 (2 wire) PID: P111 SPN: 111 FMI: 3/3 Coolant Level Sensor 1 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at engine coolant level circuit.
Cummins ISX CM870 (2003-06) Fault Code: 187 PID: S232 SPN: 1080 FMI: 4/4 Sensor Supply 2 Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at the sensor supply number 2 circuit.