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TAke a paper clip or other wire and short "A"&"B" terminals together on the aldl test connector under the dash. Count the flashes of the check engine light with the ignition on. One flash pause then 2 flashes is a code 12 and means the system is working. Each code wil repeat 3 times, then the next one will show.

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โˆ™ 2015-07-15 19:38:36
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Q: How do you read the PCM codes for a 1987 Chevy Celebrity?
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