Fuel-Cut System
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2002 Lexus SC 430, 2002 Lexus RX 300, 2002 Lexus LX 470, 2002 Lexus LS 430, and 2002 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.
During deceleration from high engine speed with throttle valve completely closed, ECM stops fuel injection to improve fuel economy and lower exhaust emissions. When engine speed falls to less than a predetermined RPM or throttle valve is opened, fuel injection is resumed. Fuel cut-off and fuel injection resumption speeds are high when coolant temperature is low.