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.
1)Open return circuit in the harness, connectors, or sensor.2)Open signal circuit or shorted to a voltage source.
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.