Question about Oldsmobile Cutlass Supreme

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Aldl 1990 Cutlass Supreme. Drove car home. All good. Let car sit overnight. Went to start next morning. Turned key all dash lights went dim. ECM acted like it went into self test mode. Tried jumping pins A to B to read codes. When jumping pins A and B at ALDL connector all dash lights and relays go nuts. Have checked stater. Stater checks good. Checked alternator. Alternator checks good. Checked circuit wire from ECM thru ALDL to ground. Circuit good. Replaced ECM and installed original MEM-CAL chip back in ECM. No luck. Cleared all grounding points and wires. No luck.

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  • Robert Kemper Aug 02, 2013

    Dennis, Thanks. 1st time I have run across something like this. Battery had voltage but looks like it had a cell or two go bad causing a short and not be able to carry amperage.

  • yadayada
    yadayada Aug 02, 2013

    One of the posts (most likely the (+) is the one) is burned through inside the sealed case, it is the most common cause of this type of failure

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  • Oldsmobile Master
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You have a defective battery.

Posted on Jul 13, 2013

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Posted on Nov 28, 2010

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SOURCE: need pin locations for analdl connector for a 1996 pontic grand am

Below is a wirinf diagram for the plug. I wasn't sure which engine you had so I went with the 3.1 liter engine. If you need the one for the 4 cylinder or if you need this one bigger (this is the largest I can post on here do to size limits) you can email me at csautomotivecars@att.net but remind me of the make model year and engine size. Hope this helps.


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Posted on Nov 16, 2011

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