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 MANUALSCADILLAC1999SEVILLE SLS V8-4.6L VIN YREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTHROTTLE POSITION SENSORDESCRIPTION AND OPERATION
1999 Cadillac Seville SLS V8-4.6L VIN Y
Throttle Position Sensor: Description and Operation
1999 Cadillac Seville SLS V8-4.6L VIN YSECTION Description and Operation
Voltage Versus Throttle Position Chart:
The TP sensor is a potentiometer that is mounted on the throttle body to measure changes in throttle valve angle. The PCM provides a 5 volt reference signal and a ground to the TP sensor and the sensor in turn sends a voltage signal representing throttle position back to the PCM. As the throttle angle increases, the voltage signal increases and as the throttle angle decreases the voltage signal decreases. A closed throttle angle will result in a voltage signal near 0 and wide open throttle will produce a signal near 5 volts.
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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.