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Typical Enabling Conditions

WARNING: This page is about a different car, the 2006 Lexus GS 430. However, it is still accessible from the selected car via links, so may be relevant.
TYPICAL ENABLING CONDITIONS

Either of following conditions A or B is met -
A. Engine switch On (IG)
B. Electric throttle motor power ON
TP sensor malfunction (P0120, P0122, P0123, P0220, P0222, P0223, P2135) Not detected