Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 1595 PID: PID 372 SPN: 974 FMI: 3 Remote Accelerator Pedal or Lever Position Sensor 1 Circuit- Voltage Above Normal or Shorted to High Source

Circuit Description
The remote accelerator position sensor is a potentiometer attached to the remote accelerator lever. The remote accelerator position sensor varies the signal voltage to the engine control module (ECM) as the remote accelerator lever is depressed and released. Low signal voltage is received by the ECM when the remote accelerator lever is at 0 percent. A high signal voltage is received by the ECM when the remote accelerator is at 100 percent. The remote accelerator pedal position circuit contains a remote accelerator pedal position 5 volt supply, remote accelerator pedal position return, and remote accelerator pedal position signal.

Component Location
The remote accelerator pedal or lever location varies with each original equipment manufacturer (OEM). Refer to the OEM service manual.

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 remote accelerator pedal signal voltage was greater than 4.37-VDC for more than 20 seconds.

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
To validate the repair, perform a key cycle, 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 amber CHECK ENGINE lamp immediately after 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 applications.

Shop Talk
If troubleshooting an intermittent accelerator problem:

The remote accelerator pedal or lever position sensor signal voltage can be monitored with INSITE™ electronic service tool, while flexing the harness to locate the intermittent connection. Intermittent connections will show up as abrupt changes in signal voltage displayed by INSITE™ electronic service tool.

Possible causes of this fault include:

Remote accelerator pedal or lever position signal circuit shorted to battery or (+) 5 volt supply
Open remote accelerator pedal or lever return circuit in the harness or connections
Remote accelerator supply shorted to battery
Malfunctioned remote accelerator pedal or lever position sensor.
NOTE: The three wires in the remote accelerator position sensor circuit must be twisted together.

Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.

Possible Cause:
1) OEM harness
2) ECM calibration