Cummins ISB CM850 (2003-06) Fault Code: 387 PID: SID 221 SPN: 1043 FMI: 3 Accelerator Pedal or Lever Position Sensor Supply Voltage Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply circuit for the accelerator pedal or lever position sensor.
Cummins ISB CM850 (2003-06) Fault Code: 387 PID: SID 221 SPN: 1043 FMI: 3 Accelerator Pedal or Lever Position Sensor Supply Voltage Circuit – Voltage Above Normal or Shorted to High Source. High voltage detected at sensor supply circuit for the accelerator pedal or lever position sensor.
This fault is logged when the ECM senses more than +5.25 volts on the accelerator pedal or lever position +5 volt supply line. This can be caused by a short circuit to a voltage source in the OEM harness or a short circuit to an actuator signal circuit that is greater than +5 volts.
Possible repairs:
1)Repair or replace the OEM harness.
2)Replace the ECM.
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