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.
1990 Geo Metro L3-61 1.0LFACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor: Adjustments
TPS Check:
TPS Output Check:
1. Connect DVM to terminals "A" and "B."
2. Turn TPS fully counterclockwise, then clockwise until DVM reads zero (no continuity).
3. Check continuity between terminals "A" and "B" with a 0.9 mm (0.035") feeler gauge inserted between throttle lever stop screw and throttle lever. DVM should read zero.
4. Repeat step above with a 0.3 mm (0.012") feeler gauge. The DVM should read continuity.
5. Tighten retaining screws. Refer to SPECIFICATIONS.
6. Connect TPS electrical connector.
7. Install air cleaner assembly.
Factory Service Tools
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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.