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 MANUALSCHEVROLET1992SUBURBAN 3/4 TON 2WD V8-454 7.4LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORDESCRIPTION AND OPERATION
1992 Chevrolet Suburban 3/4 Ton 2WD V8-454 7.4L
Throttle Position Sensor: Description and Operation
1992 Chevrolet Suburban 3/4 Ton 2WD V8-454 7.4LSECTION Description and Operation
Throttle Position Sensor Circuit:
Purpose:
The TPS provides the PCM/TCM with information regarding throttle position.
Operation:
The TPS is a potentiometer with one end connected to 5 volts from the PCM/TCM and the other to ground. A third wire is connected to the PCM/TCM to measure the voltage from the TPS.
As the throttle valve angle is changed, accelerator pedal moved, the output of the TPS also changes. At a closed throttle position, the output of the TPS is low, approximately .5 volts. As the throttle valve opens, the output increases so that at wide open throttle, the output voltage should be approximately 5 volts.
Location:
The TPS is mounted on the injection pump.
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.