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Home >> Lexus >> 2000 >> ES 300 >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1520: Stoplight Switch Signal Malfunction >> Circuit Description
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Circuit Description

The stoplight signal is used to detect when brakes have been applied. ECM uses this signal to control fuel cut-off engine speed. DTC P1520 is set if stoplight switch does not turn off when vehicle is being driven. Possible causes are:

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