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Cummins ISC CM2150 (2007-09) Fault Code: 2186 PID: SID 232 SPN: 3512 FMI: 4 Sensor Supply 4 Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at the +5 volt sensor supply circuit to the accelerator pedal position sensor.

Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If necessary, recalibrate the ECM.

Low voltage on the 5 volt supply wire can be caused by a short circuit to ground in the supply wire, a short circuit between the supply wire and return circuit, a failed accelerator, or a failed ECM power supply.

Possible repairs:

1)Replace the accelerator pedal/lever position sensor.
2)Replace the OEM harness.

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