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.
Circuit Description
This signal is used to detect that brakes have been applied. STP signal voltage is same as one supplied to stop lights. STP signal is used mainly to control fuel cut-off engine speed. Fuel cut-off engine speed is reduced slightly when vehicle is braking. Detecting condition of DTC is when stop light switch does not turn off when repeating driving 18.6 mph (30 km/h) or more and 10 times or more after depressing brake (2 trip detection logic).
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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.