The throttle position sensor (TPS) is used to inform the powertrain control module (PCM) of throttle position. The PCM uses this information to determine control of various output devices, such as the fuel injectors, transmission shift solenoids, etc. Basically, the throttle position sensor is a variable resistor. Its internal resistance and output signal voltage change in relation to throttle position.
There’s no definitive lifetime of a TPS as it’s built to survive the lifetime of your vehicle. Some common symptoms of a failed throttle position sensor include hesitation, poor acceleration, rough idle, increased emissions and an illuminated Check Engine Light. If you have any of these symptoms, you want to make sure you buy a quality throttle position sensor as a replacement. This article goes into detail with a step-by-step guide on how to replace a throttle position sensor.
Materials Needed
- Back probe leads (optional)
- Free repair manuals provides free online repair manuals for certain makes and models
- Protective gloves
- Safety glasses
- Screwdriver
- Voltmeter (optional)
Part 1 of 2: Locating & Removing the Throttle Position Sensor
Step 1: Locate the sensor. The throttle position sensor is mounted to the throttle body on top of the engine.
Step 2: Disconnect the negative battery cable and set it aside.
Step 3: Remove the electrical connector by pushing down on the tab and sliding it off.
Step 4: Remove the sensor mounting screws using a screwdriver.
Step 5: Remove the throttle position sensor from the engine.
Part 2 of 2: Installing the New Throttle Position Sensor
Step 1: Install the new sensor. Mount the new sensor in place.
Step 2: Install the sensor mounting screws by hand one at a time. Then tighten them down using a screwdriver.
Step 3: Reinstall the connector the same way you removed it.
Step 4: Reinstall the negative battery cable. Reconnect the negative terminal to the battery.
Step 5: Adjust the throttle position sensor as needed. While most throttle position sensors do not require adjustment, there are a few that do.
Typically, adjustment involves connecting a voltmeter with back probe leads to the sensor signal wire and ground. Then, with the engine running, loosen the sensor screws.
Rotate the throttle position sensor until the desired reading is achieved. If your vehicle requires throttle position sensor adjustment, consult the factory repair information for the exact specifications.
That’s what it takes to replace your throttle position sensor. Changing a TPS is fairly simple for some, but if this seems like something you’d prefer to leave to a professional, YourMechanic offers expert throttle position sensor replacement performed at your home or office.
