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.

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HOMESERVICE MANUALSPONTIAC1991LEMANS LE, 2D HATCHBACK, AUTOMATIC, 3T40/MD9REPAIR AND DIAGNOSISENGINE PERFORMANCEENGINE CONTROLS - SPECIFICATIONSTHROTTLE POSITION SENSOR

1991 Pontiac LeMans LE, 2D Hatchback, Automatic, 3T40/MD9

Throttle Position Sensor

1991 Pontiac LeMans LE, 2D Hatchback, Automatic, 3T40/MD9SECTION Throttle Position Sensor

THROTTLE POSITION SENSOR (TPS) VOLTAGE TEST ⁽¹⁾

Application

Volts

Closed Throttle

.4-1.25

Full Throttle

4.8

⁽¹⁾	Measure voltage at circuit No. 417 (Blue wire) with circuit No. 452 (Black wire) grounded and a 5-volt reference supplied to circuit No. 416 (Gray wire).

RENDER: 1.0x

NO RELATED

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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.