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
Throttle Position Sensor (TPS) is auto-zeroing and is not adjustable. To test TPS, connect Tech 2 or equivalent scan tool to Data Link Connector (DLC). DLC is located behind cover on lower leftside of dash. Turn ignition on. On scan tool, observe TPS voltage parameters. With throttle in idle position, TPS should read as specified. See CHECKING THROTTLE POSITION SENSOR VOLTAGES table.
| Throttle Position Switch No. | Specification (Volts) |
|---|---|
| TPS 1 | About .4 |
| TPS 2 | About 4.6 |
| TPS 3 | About 4.6 |
If TPS voltage parameters are not as specified, remove intake pipe from throttle body and check for bent or binding throttle shaft. If problem is found, replace TPS. See REMOVAL, OVERHAUL & INSTALLATION article.
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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.