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Cummins ISX CM870 (2003-06) Fault Code: 431 (NISS) PID: S230 SPN: 558 FMI: 2/2 Accelerator Pedal Idle Validation Circuit – data incorrect. Voltage detected simultaneously on both idle validation and idle validation off-idle validation switches.
NISS Goes to 70-fc 431niss
Possible causes:
1)Open circuit on either the idle validation on-idle or off-idle signal circuits, a loose connection, uncalibrated accelerator pedal assembly, or miswired idle validation switch.2)The nonintegrated sensor switch has a different internal resistance specification (10 ohms) than the integrated sensor switch (ISS).3)When installing a new accelerator pedal assembly, it must be calibrated before operating the engine. To calibrate, turn the keyswitch to ON position and fully depress and release the pedal three times.
Possible repairs:
1)Connect the NISS to the OEM harness.2)Replace the NISS.3)Repair or replace the OEM harness.
Cummins ISX CM870 (2003-06) Fault Code: 429 PID: P097 SPN: 97 FMI: 4/4 Water-in-Fuel Indicator Sensor Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at the water-in-fuel circuit.
Cummins ISX CM870 (2003-06) Fault Code: 428 PID: P097 SPN: 97 FMI: 3/3 Water-in-Fuel Indicator Sensor Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at the water-in-fuel circuit.
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.
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.