Cummins ISM CM870 (2003-06) Fault Code: 386 PID: S232 SPN: 1079 FMI: 3/3 Sensor Supply 1 Circuit - Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply number 1 circuit.

High voltage on the (+) 5 volt supply line can be caused by a short to battery voltage in the engine harness or connectors, or a malfinctioning ECM.

Possible repair:

1)Relace the ECM.
2)Repair or replace the engine harness.
3)Replace the OEM harness.

Cummins ISM CM870 (2003-06) Fault Code: 352 PID: S232 SPN: 1079 FMI: 4/4 Sensor Supply 1 Circuit - Voltage Below Normal or Shorted to Low Source. Low voltage detected at sensor supply number 1 circuit.

Cummins ISM CM870 (2003-06) Fault Code: 343 PID: S254 SPN: 629 FMI: 12/12 Electronic Control Module Warning Internal Hardware Failure - Bad Intelligent Device or Component. ECM power supply errors have been detected.

Cummins ISM CM870 (2003-06) Fault Code: 341 PID: S253 SPN: 630 FMI: 2/2 Engine control module (ECM) data lost.

Cummins ISM CM870 (2003-06) Fault Code: 339 PID: S087 SPN: 1267 FMI: 4/4 Idle Shutdown Vehicle Accessories Relay Driver Circuit - Voltage Below Normal, or Shorted to Low Source. Low voltage detected at the idle shutdown vehicle accessory or ignition bus relay circuit when commanded ON.

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