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I need check engine codes for a 1988/89 Chev. S-10 Pickup 2.5L 4 cyl.?

I shorted pins 5 and 6 today to find the code for my truck. I get a check engine light sometimes when I get on the highway or when I am driving for a moderate period of time at the same speed. I have a stick shift, if that means anything. When I short


I think you need to short pins 1 and 2....not 5 and 6. Then turn the key on. It will flash a couple of 12 codes, then it will start to flash failure codes. For instance 2 flashes, then 4....code 24, and so on. It will start over again with the first

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