Cummins ISB CM850 (2003-06) Fault Code: 131 PID: 91 SPN: 91 FMI: 3 Accelerator Pedal or Lever Position Sensor Circuit – Shorted High. High voltage detected at accelerator pedal or lever position circuit.

Cummins ISB CM850 (2003-06) Fault Code: 131 PID: 91 SPN: 91 FMI: 3 Accelerator Pedal or Lever Position Sensor Circuit – Shorted High. High voltage detected at accelerator pedal or lever position circuit.

If troubleshooting an intermittent accelerator problem:

The accelerator pedal or lever position sensor signal voltage can be monitored with the INSITE? electronic service tool, while flexing the harness to locate the intermittent connection.

Possible causes:

1)Accelerator pedal or lever position signal circuit shorted to battery or +5 VDC supply
2)Open accelerator pedal or lever return circuit in the harness or connections
3)Accelerator supply shorted to battery
4)Failed accelerator pedal or lever position sensor.

NOTE: The three wires in the accelerator position sensor circuit must be twisted together.

Possible repairs:

1)Replace the accelerator pedal or lever.
2)Replace the accelerator pedal or lever.
3)Replace the ECM.