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1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-17-2008, 09:51 PM   #1
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Default pulling codes with paperclip

1987-1993 ECM Code Retrieval

Locate terminals "A" & "B", the 2 uppermost right-hand terminals, "A" is the one the right. You must use a short wire to ground out these terminals, or a hairclip, paperclip, or something similar. Short the terminals with the ignition off, then turn the ignition to "on" but do not start the car. The ECM will display "Code 12" by flashing the "Service Engine Soon" light indicating the system is working. Code 12 is simply one flash, followed by a brief pause, then two flashes in quick succession. This code will flash three times. If no codes are stored code 12 will continue to flash until the ground is removed from the terminal.
After flashing three times, the ECM will display any stored trouble codes. WHERE DOES IT DISPLAY THEM? IN THE DRIVER INFORMATION BOX?? Each code will be flashed three times then code 12 will be flashed again indicating display is completed.

I DONT SEE anything happening except service enine soon flashing over and over and over. Does that mean NO codes are present? And again, where WOULD THEY be displayed if thats the case
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Old 03-17-2008, 09:52 PM   #2
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it displays it in the dash (instrument cluster), the Service Engine Soon light will flash. What yours is doing is correct. Just count the times that it does it. Check this link for more help

http://www.w-body.com/ecm-codes.html
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Old 03-17-2008, 10:08 PM   #3
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PLEASE continue in your other topic where you already brought this up. We need to keep all your problems in ONE topic or we can't keep up with all the suggestions and answers.
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