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Cummins ISX CM870 (2003-06) Fault Code: 426 PID: S231 SPN: 639 FMI: 2/2 Communication between the electronic control module (ECM) and another device on the SAE J1939 data link has been lost.

This fault occurs whenever the ECM starts communicating with any other device using the SAE J1939 data link and then can no longer transmit on the data link.

Possible causes:

1)Electrical problems with the SAE J1939 data link wiring such as grounded, shorted, or open circuits2)The ECM (or another SAE J1939 device) tying up communications by sending too many consecutive messages.

Possible repairs:

1)Clean the connector and pins.

2)Repair the damaged harness connector or pins, if possible.

Cummins ISX CM870 (2003-06) Fault Code: 418 PID: P097 SPN: 97 FMI: 0/15 Water-in-Fuel Indicator – Data Valid But Above Normal Operating Range – Least Severe Level. Water has been detected in the fuel filter.
Cummins ISX CM870 (2003-06) Fault Code: 415 PID: P100 SPN: 100 FMI: 1/1 Engine Oil Rifle Pressure – Data Valid But Below Normal Operating Range – Most Severe Level. Oil pressure signal indicates oil pressure is below the engine protection critical limit.
Cummins ISX CM870 (2003-06) Fault Code: 387 PID: S221 SPN: 1043 FMI: 3/3 Accelerator Pedal Position Sensor Supply Voltage Circuit – shorted high. High voltage detected at sensor supply circuit for the accelerator pedal position sensor.
Cummins ISX 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.
Cummins ISX 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 ISX 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.