Diagnostic lights not working

[racemyZ]

Hey guys, thanks for the help in how to do ECU diagnostics. One little problem - I turn the key on, turn the knob on the computer clockwise, wait 3 secs, turn it back - then nothing happens.... did this bout 20 times, nothing worked - exhaust smells like ass, a/c fan constantly on - Any clues?! Thanks

[tnkrstoyco]

Sounds like maybe the ECU is bad, have ou recently upgraded the chip and perhaps put it in backwards.

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