Circuit Description
WARNING: This page is about a different car, the 2003 Lexus LS 430. 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. See Fig 1. Fuel cut-off engine speed is reduced slightly when the vehicle is braking. Possible causes are:
- Faulty switch circut.
- Faulty brake switch.
- Faulty ECM.