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07-26-2003, 08:05 AM
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Chevy ECM ALDL question
The "Service engine soon" light came on while driving my 1987 Chevy G20 van. It uses the AC Delco 1227747 ECM. As per instructions, I put a paper clip in slots A/B of the ALDL connector under the dash to review the diagnostic codes.
After I did so, the SES light no longer comes on, even on start up. The bulb is OK. The engine runs fine. How do I know if the computer is still working properly??? Checked all fuses too. thanks, mark 
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07-29-2003, 09:58 PM
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ecm aldl
when you ground the a/b pins you should have the key in the on posistion and if there is nothing wrong you should get a code 12(blink,pause, blink blink) . If you dont get a code 12 you have to go to the next step. I have seen ecms do this and sometimes the only way to get the codes outare with a scanner. hope this helps.
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