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Home >> Lexus >> 2000 >> SC 400 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1633: Electronic Throttle Control System (ETCS) Circuit ECM Malfunction >> Circuit Description

Circuit Description

ETCS is composed of throttle control motor, electromagnetic clutch, Throttle Position (TP) sensor, accelerator position sensor, ECM and throttle body. If DTC P1633 is set, ECM shuts down power to throttle control motor and electromagnetic clutch. DTC P1633 is set when ECM malfunctions. Possible causes are:

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