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 (TPS)
The TPS is mounted on the side of throttle body, opposite the throttle lever. A 5-volt reference voltage is supplied to TPS, and a signal circuit transmits the dropped voltage to ECM. With ignition on and 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 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.