Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Throttle Position Sensor
The TPS is mounted on the side of the throttle body, opposite the throttle lever. A 5-volt reference voltage is supplied to the TPS and a signal circuit transmits the dropped voltage to the ECM. With key on, engine off, TPS voltage signal should be 1.25 volts (throttle closed) or less. An ALDL Scan tester may be used to check TPS voltage. If voltage is greater than 1.25 volts, replace the TPS.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.