Alternative Fuels Engine Control Module Location
WARNING: This page is about a different car, the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, and 2002 Chevrolet Chevy Express. However, it is still accessible from the selected car via links, so may be relevant.
On CNG engines, an Alternative Fuels Engine Control Module (AF ECM) is used. AF ECM is located on radiator core support bracket.