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 MANUALSSATURN1996SC2 L4-1.9L DOHC VIN 7REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORDESCRIPTION AND OPERATION
1996 Saturn SC2 L4-1.9L DOHC VIN 7
Throttle Position Sensor: Description and Operation
1996 Saturn SC2 L4-1.9L DOHC VIN 7SECTION Description and Operation
The Throttle Position (TP) sensor is mounted to the throttle body and connected to the throttle plate shaft. The throttle position sensor is a potentiometer with a five volt reference input and a signal ground supplied by the PCM. A sensor output signal to the PCM is a DC signal that varies according to throttle position angle. As the throttle angle changes the signal to the PCM varies.
The throttle position sensor is used in conjunction with other engine sensors to relay input to the PCM in order to control a 14.7 to 1 air/fuel ratio under all throttle positions.
At a closed throttle position, the output of the throttle position sensor is low (approximately 0.5 volt). As the throttle plate opens, the output signal increases so that, at wide-open throttle, the output voltage will be high (approximately five volts).
An unstable throttle position sensor at idle, varying more than four counts will disrupt closed loop engine idle control.
The throttle position sensor is used in conjunction with other engine sensors to relay input to the PCM in order to control a 14.7 to 1 air/fuel ratio under all throttle positions.
At a closed throttle position, the output of the throttle position sensor is low (approximately 0.5 volt). As the throttle plate opens, the output signal increases so that, at wide-open throttle, the output voltage will be high (approximately five volts).
An unstable throttle position sensor at idle, varying more than four counts will disrupt closed loop engine idle control.
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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.