Throttle Position Sensor Symptoms and Repair Advice
What is a Throttle Position Sensor (TPS)?
The throttle position sensor is a small part that has a big job. It is a key component of the emissions system. It rests on the throttle body of most vehicles and is typically held on with two to three fasteners.
It's located on the throttle body and reads the angle of the throttle valve based on the position of the gas pedal. It then transmits the data to the engine control computer.
Symptoms of Wear or Failure of the Throttle Position Sensor
- Check Engine Light may come on
- Engine may hesitate, misfire, or jerk upon acceleration
- Automatic transmission may shift erratically
- Engine may stall without warning
Related Repair Advice
- Only use factory OEM throttle position sensors and be sure to check for any relevant Technical Service Bulletins (TSBs), plus any necessary software updates and re-calibration procedures
- A throttle position sensor code isn't always triggered by a defective throttle position sensor. It can be triggered by a defective crankshaft position sensor, MAP sensor, mass air flow sensor, ignition problem, defective PCM, or wiring related issue.
How to Replace the Throttle Position Sensor
When replacing the throttle position sensor, be sure to clean the throttle body, check the throttle cables, and make sure that the air filter is clean.
- Remove the rubber air intake tube to gain access to the throttle position sensor
- In some cases, the throttle body may have to be removed to gain access to the sensor
- Disconnect the electrical connector from the old sensor
- Remove the fasteners and old throttle position sensor
- When installing the new sensor, make sure the rotating teeth are properly aligned
- Tighten the fasteners and connect the electrical connector
- Clear any PCM codes and perform a Drive Cycle Test Drive to verify the repair
Note: After replacement of the throttle position sensor, the powertrain control module needs to have the throttle position adaption reset. This is so the PCM can re-calibrate itself to the new throttle position sensor.