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Home >> Lexus >> 2003 >> SC 430 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0571: Brake Switch "A" Circuit >> Circuit Description

Circuit Description

NOTE: Brake switch may also be referred to as stop light switch.

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. Fuel cut-off engine speed is reduced slightly when the vehicle is braking. Possible causes are:

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