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.
1989 Geo Spectrum 2D Hatchback, AutomaticFACTORY OEM SERVICE PROCEDURE
Throttle Position Sensor (TPS): Inspection
- Remove carburetor. Attach ohmmeter leads to Green wire and Black wire of TPS. Move throttle to the 1/3 open position. Ohmmeter indicator should indicate no continuity.
- Slowly begin closing throttle. Ohmmeter indicator should indicate continuity when throttle valve-to-throttle bore reaches .015 (.38 mm) for models with A/T and .011" for models with M/T See Figure .
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.