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 XFiFACTORY OEM SERVICE PROCEDURE

Throttle Position Sensor (TPS) - A/T

THROTTLE POSITION SENSOR (TPS) RESISTANCE - A/T

Application Condition

Resistance (Ohms)

Between Terminals A-B ⁽¹⁾

Continuity

Between Terminals A-B ⁽²⁾

No Continuity

Between Terminals A-B ⁽³⁾

Continuity

Between Terminals A-D ⁽³⁾

4370-8130

Between Terminals A-C ⁽³⁾

240-1140

Between Terminals A-C ⁽⁴⁾

3170-6600

⁽¹⁾	With .012" (.30 mm) feeler gauge installed between stop screw and lever.

⁽²⁾	With .035" (.89 mm) feeler gauge installed between stop screw and lever.

⁽³⁾	Throttle valve at idle position.

⁽⁴⁾	Throttle valve at fully open position.

Fig 1: Identifying Throttle Position Sensor Terminals (A/T Only)

Courtesy of GENERAL MOTORS CORP.

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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.