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 MANUALSSATURN2002SL1 L4-1.9L SOHC VIN 8REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORDESCRIPTION AND OPERATION
2002 Saturn SL1 L4-1.9L SOHC VIN 8
Throttle Position Sensor: Description and Operation
2002 Saturn SL1 L4-1.9L SOHC VIN 8SECTION Description and Operation
THROTTLE POSITION (TP) SENSOR
The TP sensor is located on the throttle body connected to the throttle plate shaft. The TP sensor is a potentiometer that varies resistance according to changes in throttle plate position. The PCM measures the signal voltage from the TP sensor, which is a reduced value of the PCM 5 volt reference. The voltage ranges from 0.4 (+/- 0.2) volts at 0% throttle position to 4.7 volts at wide open throttle
The TP sensor is used for:
^ Clear flood mode Cruise control operation
^ Deceleration enleanment
^ TAC valve opening for throttle following
^ Idle determination
^ Transaxle shifting/TCC operation Wide open throttle conditions
The TP sensor is located on the throttle body connected to the throttle plate shaft. The TP sensor is a potentiometer that varies resistance according to changes in throttle plate position. The PCM measures the signal voltage from the TP sensor, which is a reduced value of the PCM 5 volt reference. The voltage ranges from 0.4 (+/- 0.2) volts at 0% throttle position to 4.7 volts at wide open throttle
The TP sensor is used for:
^ Clear flood mode Cruise control operation
^ Deceleration enleanment
^ TAC valve opening for throttle following
^ Idle determination
^ Transaxle shifting/TCC operation Wide open throttle conditions
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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.