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obd 1 pids

Or the bent paper clip in the ALDL connector under the dash and let the lamp flashum out to You. Welcome to thetruckstop Maxx.
 
The GM tech 1, tech 1a were the original scan tools. The chinese knock off tech 2's(if from a reputable seller) can also read back to 92. Or you have GMTDscantech.
 
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