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On certin models in the year of 1995-1996 an obd-1 system was used with a datalink obd-2connecter a special interface cable is made just for this style .i found what i needed at Auto xray scanner' they are some times avalibale on ebay . You use the obd-2 scan tool to read it. Yours should be one of the three systems if yours is the obd-2 shape connector but has only 6or so pins(dont remember the count exactly at this time ) A regular obd-2 has about 16 pins with most full .I have been through this to learn the hard way.If you definitly have a 1 or 2 try to obtaine a true gm factory service manual these are worth there weight in gold. find them on ebay Pays for its self many times over

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10y ago
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Q: 1995 Pontiac firebird What causes pcm not to communicate with scan tool?
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