Closed Throttle Position Recognition
WARNING: This page is about a different car, the 1993 Mercedes-Benz 300E. However, it is still accessible from the selected car via links, so may be relevant.
Closed throttle position is identified through closed throttle position switch in electronic accelerator control actuator (with ASR) or cruise control/idle speed control actuator (without ASR). The engine control module receives information from electronic accelerator control module (with ASR) or cruise control/idle speed control module (without ASR) that throttle is closed. The engine control module uses closed throttle position sense to control fuel injection during warm-up, deceleration fuel injection shutoff, ignition at idle, and catalyst warm-up.