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 MANUALSCHEVROLET1991S10/T10 P/U 4WD V6-262 4.3LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORDESCRIPTION AND OPERATION
1991 Chevrolet S10/T10 P/U 4WD V6-262 4.3L
Throttle Position Sensor: Description and Operation
1991 Chevrolet S10/T10 P/U 4WD V6-262 4.3LSECTION Description and Operation
Throttle Position Sensor:
The Throttle Position Sensor (TPS) is connected to the throttle valve shaft in the throttle body unit. The TPS is a potentiometer with one connection to ground, and the other to the computer 5 volt reference source. A third wire from the computer is used to measure the output voltage from the TPS. As the throttle angle changes (pressing down on accelerator pedal) so does the TPS voltage output. By monitoring TPS voltage output, the computer can determine fuel delivery rate based on throttle valve angle or driver demand.
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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.