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.
Throttle Position Sensor
Engine Control Module (ECM) monitors angle sensors for throttle valve position. Angle sensors are potentiometers, and are located in Throttle Valve Control Module (TVCM) or Throttle Position (TP) sensor. ECM calculates throttle position based on percentage values sent by angle sensors. Angle sensors No. 1 and 2 display throttle positions from 3-97 %. Angle sensors run opposite of each other. Angle sensor No. 1 runs from 3-93 % (0-5 volts), the larger the throttle opening the higher the percentage (voltage) reading. Angle sensor No. 2 runs from 93-3 % (5-0 volts), the larger the throttle opening the smaller the percentage (voltage) reading. Angle sensor No. 3 runs from 12-97 %, the larger the throttle opening the higher the percentage (voltage) reading. Angle sensor No. 4 runs from 4-49 %, the larger the throttle opening the higher the percentage (voltage) reading. To test throttle position sensors, see appropriate DTC for THROTTLE POSITION SENSOR under DIAGNOSTIC TROUBLE CODE DEFINITIONS in appropriate SELF-DIAGNOSTICS article.
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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.