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Home >> Lexus >> 1998 >> LX 470 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Self-Diagnostic Tests >> DTC P1127: Electronic Throttle Control System Actuator Power Source Circuit Fault >> Circuit Description

Circuit Description

Battery voltage is supplied to circuit +BM at ECM E9 connector at all times. If DTC P1127 is present, ECM turns off power to throttle motor and magnetic clutch and throttle valve is fully closed by the return spring. When this occurs, opening angle of throttle valve can be controlled by the accelerator pedal by means of the throttle cable. DTC is set when ECM detects an open ETCS power source circuit. Possible causes are:

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