Cummins ISB CM850 (2003-06) Fault Code: 187 (Marine) PID: SID 232 SPN: 1080 FMI: 4 Sensor Supply 2 Circuit – Voltage Below Normal, or Shorted to Low Source. Low voltage detected at the sensor supply number 2 circuit.
Low voltage on the +5-VDC supply line can be caused by a short circuit to ground in a supply line, a short circuit between a supply line or a return line, a failed sensor, or a failed ECM power supply.
Possible repairs:
1)Replace the intake manifold pressure sensor.
2)Replace the rail fuel pressure sensor.
3)Repair or replace the engine harness.
4)Replace the ECM.
Cummins ISB CM850 (2003-06) Fault Code: 187 (Auto) PID: SID 232 SPN: 1080 FMI: 4 Sensor Supply Voltage Number 2 Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at the sensor supply number 2 circuit.
Cummins ISB CM850 (2003-06) Fault Code: 155 (Marine) PID: 105 SPN: 105 FMI: 0 Intake Manifold 1 Temperature – Data Valid but Above Normal Operational Range – Most Severe Level. Intake manifold air temperature signal indicates intake manifold air temperature above engine protection critical limit.
Cummins ISB CM850 (2003-06) Fault Code: 155 (Auto) PID: 105 SPN: 105 FMI: 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 ISB CM850 (2003-06) Fault Code: 154 PID: 105 SPN: 105 FMI: 4 Intake Manifold Air Temperature Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low signal voltage detected at intake manifold air temperature circuit.
Cummins ISB CM850 (2003-06) Fault Code: 153 PID: 105 SPN: 105 FMI: 3 Intake Manifold Air Temperature Sensor Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at intake manifold air temperature circuit.
Cummins ISB CM850 (2003-06) Fault Code: 151 (Marine) PID: 110 SPN: 110 FMI: 0 Engine Coolant Temperature – Data Valid but Above Normal Operational Range – Most Severe Level. Engine coolant temperature signal indicates engine coolant temperature above engine protection critical limit.
