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PACCAR PX-8 CM2150 (2007-09) Fault Code: 293 PID: 441 SPN: 441 FMI: 3 Auxiliary Temperature Sensor Input 1 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage or open circuit detected at the OEM auxiliary temperature circuit.

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.

Possible causes:

1)Open return circuit in the harness, connectors, or sensor
2)Open signal circuit or shorted to a voltage source.

Possible repairs:

1)Refer to the OEM service manual for additional specifications.
2)Replace the OEM temperature sensor.
3)Repair or replace the OEM harness.
4)Replace the ECM.

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