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On the aldl connector under the dash, short the "A" and "B" openings with a paper clip and read the flashes of the check engine light. A code 12 { one flash pause then 2 flashes} means the system is operating. Any other code will follow and is flashed 3 times. This works on all GM previous to '96

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โˆ™ 2004-10-29 11:12:01
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Q: Is it possible to read the computer codes without an obdI scanner on a 1994 Cavalier Z24 and if so how?
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