Cummins ISM CM870 (2003-06) Fault Code: 134 PID: P029 SPN: 974 FMI: 4/4 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.

Possible causes:

1)Remote accelerator pedal or lever position signal shorted to engine ground or return wires in the OEM harness or sensor
2)Damaged remote accelerator pedal or lever position sensor
3)Open circuit in the remote accelerator signal, supply, or return wire in the harness or connectors.
NOTE: The three wires in the remote accelerator position sensor circuit must be twisted together.

Possible repair:

1)Repair or replace the OEM wiring harness.
2)Replace the remote accelerator pedal or lever position sensor.