Question about 1990 Chevrolet C1500
Under your dash where the ALDL is located the rectangle plug on the drivers side you take a jumper wire and jump it with the key off from the test terminal to the ground terminal the two upper right plug holes then turn the key on DO NOT START IT!!!!! then the service engine soon light will flash code 12 it will be one flash a short pause then two flashes after another slightly longer pause the code will repeat itself two more times that says the diagnostic syatem is working if there is nothng wrong 12 will repeat itself over and over but if there is a problem it will flash the code 3 times then code 12 3 times and the next code if there is more than 1 code stored then you can look in a haynes manual or manual of the sort and it will tell you which each code is or you can go to an auto parts house and they can hook it up to the scanner for free then tell you what you need
Posted on Aug 02, 2008
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Posted on Jan 02, 2017
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