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 MANUALSOLDSMOBILE1988NINETY-EIGHT V6-3800 3.8LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORDESCRIPTION AND OPERATION
1988 Oldsmobile Ninety-Eight V6-3800 3.8L
Throttle Position Sensor: Description and Operation
1988 Oldsmobile Ninety-Eight V6-3800 3.8LSECTION Description and Operation
The TPS is connected to the throttle valve shaft in the throttle body unit. The TPS is a potentiometer with one connection to ground and a second to a current regulated 5 volt reference source in the ECM. A third connection goes to the ECM and is used to measure the voltage from the TPS. As the throttle angle changes, so does the TPS voltage output. By monitoring TPS voltage output, the ECM can determine throttle valve angle and use this information, compared with information from other sensors, to calculate fuel delivery rate.
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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.