SOURCE: were can i view 1980 chevy truck emissions diagrems or hose
G'day mate HAYNES are the best manuals ive found but for that age of vehicle there must be a heaps of real chevy manuals available check 2nd hand books and old garages that dont use a lot of those books any more
SOURCE: 1997 chevy s10 zr2 failed emissions
You most likely have a blown Auxilliary Power Outlet fuse. (Happens all the time) The Auxilliary Power Outlet fuse also powers you Data Link Connector (DLC). If the DLC has no power, the computer scanner will not communicate with the engine computer.
Check Fuse #7 (25 Amp) in the instrument panel fuse block. (See diagram)
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