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Home >> Lexus >> 2003 >> GS 300 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P2118: Throttle Actuator Control Motor Current Range/Performance >> Circuit Description

Circuit Description

Battery positive voltage is supplied to terminal +BM of the ECM even once when the ignition switch is OFF for the electric throttle control system. If this malfunction is detected ECM shuts down the power for the throttle motor, and the throttle valve is fully closed by the return spring. Throttle valve is locked at a certain opening angle. Electronically controlled throttle operation is cancelled until the system returns to normal and the ignition switch is turned OFF. See Fig 1. Possible causes are:

Fig 1: Identifying Throttle Actuator Control Motor Circuit
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