Electronic Control System Signature, ISX and QSX15 Engines – FAULT CODE 133

Remote Throttle Position Sensor Circuit


Fault Code: 133
PID: P029
SPN: 974
FMI: 3/3

High voltage detected at the remote throttle position signal circuit.

None on performance if remote throttle is not used.

Remote Throttle Position Sensor Circuit

Circuit Description

The remote throttle pedal provides the driver’s throttle command to the electronic control module (ECM) through the OEM harness and the OEM interface harness. The ECM uses this signal to determine the fueling command.

Component Location

The remote throttle pedal location varies with each OEM. Use the OEM troubleshooting and repair manual.

Shop Talk

The throttle position sensor is a potentiometer. The throttle position sensor resistance specifications are:

  • Between supply and return = 2000 to 3000 ohms
  • Between supply and signal: Released = 1500 to 3000 ohms, Depressed = 200 to 1500 ohms

If the throttle or throttle position sensor is replaced, or after a calibration download is performed, cycle the throttle pedal (turn keyswitch on) through its complete travel three times. This procedure calibrates the new throttle with the ECM.

  • The remote throttle enable switch must be turned on for the remote throttle to operate.
  • Possible causes of this fault code include an open circuit in the return wire, short circuit to (+) 5 VDC or (+) 12 VDC, defective remote throttle position sensor, or a failed ECM power supply.

Refer to Troubleshooting Fault Code t05-133.

Last Modified:  26-Oct-2010