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): Adjustment
If resistance values are incorrect, loosen TPS hold-down screws and slowly rotate TPS until correct specification is obtained. If correct specification can not be obtained, replace TPS.
THROTTLE POSITION SENSOR (TPS) RESISTANCE
| Application Condition | Resistance (Ohms) | ||
|---|---|---|---|
| Green & Black/White Wire | |||
| Throttle 1/3 Open | No Continuity | ||
| Throttle Open: | |||
| A/T .015" (.38mm) | Continuity | ||
| M/T .011" (.28mm) | Continuity | ||
Factory Service Tools
Use the Manual With the Right Hardware
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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.