PACCAR PX-9 CM2350 (2013-17) Fault Code:297 PID:297 SPN:1388 FMI:3 Auxiliary Pressure Sensor Input 2 Circuit – Voltage Above Normal or Shorted to High Source

Reason:
Auxiliary Pressure Sensor Input 2 Circuit – Voltage Above Normal or Shorted to High Source. High signal voltage detected at the OEM pressure circuit.

Effect:
None on performance

Circuit Description:
The original equipment manufacturer (OEM) has the option of wiring a pressure or temperature sensor input to the Cummins® engine control module (ECM). A specific calibration is then created to recognize this pressure or temperature sensor input. This fault code is activated when the pressure or temperature input from the OEM sensor exceeds the engine protection limit defined by the OEM. Depending on OEM requirements, an Engine Protection derate can be associated with this fault code.

Component Location:
The OEM pressure sensor input and location will vary. Refer to the OEM service manual for sensor location.

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 Engine Control Module (ECM) detected the OEM pressure signal circuit was out of range high.

Action Taken When the Fault Code is Active:
The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.

Conditions for Clearing the Fault Code:
1) To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
2) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
3) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
4) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults.

Shop Talk:
N/A

Possible Causes:
1) Open return circuit in the harness, connectors, or sensor.
2) Signal circuit shorted to sensor supply or battery voltage