Cummins ISX12 CM2250 (2010-12) Fault Code: 239 PID: SID 232 SPN: 3511 FMI: 3 Sensor Supply 3 Circuit- Voltage Above Normal or Shorted to High Source

Circuit Description
The sensor supply 3 circuit provides a 5 volt supply to the primary engine speed/position sensor.

Component Location
Not applicable.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes
The electronic control module (ECM) detects the sensor supply 3 signal voltage is more than a calibratible value for more than 1 second.

Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE light and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.
The backup engine speed sensor will be used by the ECM for the engine speed signal.
Conditions for Clearing the Fault Code
To validate the repair, start the engine and let it idle for 1 minute.
The fault code status displayed by INSITE? electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
The ECM will turn off the MIL after three consecutive ignition cycles that the diagnostic runs and passes.
For OBD engines, the ECM will turn off the MIL after 3 consecutive trips where the diagnostic runs and passes.
The ?Reset All Faults? command in INSITE? electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD engines.

Shop Talk
High voltage on the +5 volt supply wire can be caused by a short to battery voltage in the engine harness or connectors, or a damaged ECM.

Possible Cause:
1) Engine Harness
2) ECM calibration