Circuit Description
WARNING: This page is about a different car, the 2003 Toyota 4Runner. However, it is still accessible from the selected car via links, so may be relevant.
This signal is used to detect when the brakes have been applied. The STP signal voltage is the same as the voltage supplied to the stop lights. The STP signal is used mainly to control the fuel cut-off engine speed (The fuel cut-off engine speed is reduced slightly when the vehicle is braking). DTC is set if stoplight switch does not turn off when vehicle is being driven (with cruise control function). Possible causes are:
- Stoplight switch signal circuit is shorted.
- Defective stoplight switch.
- Defective ECM.