LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 1999 >> SC 400 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - Tests >> Diagnostic Tests >> DTC P1633: Electronic Throttle Control System (ETCS) Circuit ECM Malfunction >> Circuit Description
September 30: LEMON manuals is back up on a temporary server! Slowness is possible

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:

scientia non olet · About LEMON Manuals