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.
Closed Throttle Position (CTP) Switch
CTP switch is located in a common housing with the TP sensor on the bottom of the throttle housing. See Fig 1 . CTP switch closes at about 1.5 degrees before primary throttle plates close. When CTP switch is closed, a ground signal is supplied to PCM. PCM uses this ground signal to activate the following functions:
- Idle stabilization.
- Deceleration fuel shut-off with engine warm and engine speed greater than 1500 RPM. Fuel supply is reactivated when engine speed falls to less than 1200 RPM.
- Special ignition map for deceleration.
NO RELATED
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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.