Engine Control Module (ECM) Description: Notes
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The engine control module (ECM) processes the various input information. The ECM sends the necessary electrical responses to control fuel delivery.
The input information has an interrelation to more than one output. One failed input can affect more than one systems operation.