the light is the emission control system. there is a plug (6) holes next to the battery on about an 8 inch free pigtail. it has a cover on it. remove the cover, with the holes facing you...the wires away from you...and the lock tab on top jump the bottom row terms 1 and 2. (bottom row left two). turn key on count flashes. 1 flash (catch all) mixture or idle. 3 flashes vacuum sensor (usually wires broken). pull fuses for twc or disconnect battery to reset.