PACCAR PX-8 CM2150 (2007-09) Fault Code: 134 PID: 372 SPN: 974 FMI: 4 Remote Accelerator Pedal or Lever Position Sensor 1 Circuit – Voltage Below Normal or Shorted to Low Source. Low voltage detected at remote accelerator position signal 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.

If troubleshooting an intermittent accelerator problem:

The remote accelerator pedal or lever position sensor signal voltage can be monitored with the 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 the INSITE™ electronic service tool.

Possible causes:

1)Remote accelerator pedal or lever position signal circuit shorted to battery or +5 volt supply.
2)Open remote accelerator pedal or lever return circuit in the harness or connections.
3)Remote accelerator supply shorted to battery.
4)Failed remote accelerator pedal or lever position sensor.

NOTE: The three wires in the remote accelerator position sensor circuit must be twisted together.

Possible repairs:

1)Replace the accelerator pedal or lever.
2)The removal and installation of the connector corrected the problem.
3)Repair or replace the OEM harness.
4)Replace the ECM.