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Home >> Lexus >> 2000 >> SC 400 >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1633: Electronic Throttle Control System (ETCS) Circuit ECM Malfunction >> Circuit Description
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Circuit Description

WARNING: This page is about a different car, the 2000 Lexus GS 400. However, it is still accessible from the selected car via links, so may be relevant.

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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