1)Open return circuit in the engine harness, connectors, or sensor.2)Signal wire shorted to sensor supply or battery voltage.
1)Repair or replace the OEM harness.2)Replace the ECM.3)Replace the engine coolant level sensor.
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.
Cummins ISX CM870 (2003-06) Fault Code: 155 PID: P105 SPN: 105 FMI: 0/0 Intake Manifold 1 Temperature – Data Valid But Above Normal Operating Range – Most Severe Level. Intake manifold air temperature signal indicates intake manifold air temperature above engine protection critical limit.
Cummins ISX CM870 (2003-06) Fault Code: 154 PID: P105 SPN: 105 FMI: 4/4 Intake Manifold 1 Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at intake manifold air temperature circuit.
Cummins ISX CM870 (2003-06) Fault Code: 153 PID: P105 SPN: 105 FMI: 3/3 Intake Manifold 1 Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at intake manifold air temperature circuit.
Cummins ISX CM870 (2003-06) Fault Code: 151 PID: P110 SPN: 110 FMI: 0/0 Engine Coolant Temperature – Data Valid But Above Normal Operating Range – Most Severe Level. Engine coolant temperature signal indicates engine coolant temperature above engine protection critical limit.
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.