Cummins ISX CM870 (2003-06) Fault Code: 131 PID: P091 SPN: 91 FMI: 3/3 Accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at accelerator pedal position number 1 circuit

Possible causes:

1)Accelerator pedal or lever position signal circuit shorted to battery or (+) 5 volt supply
2)Open accelerator pedal return circuit in the harness or connections
3)Accelerator supply shorted to battery
4)Malfunctioning accelerator pedal or lever position sensor.
NOTE: The three wires in the accelerator position sensor circuit must be twisted together.

Possible repair:

1)Repair the damaged harness, connector, or pins, if possible.
2)Repair or replace the OEM wiring harness.