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Originally Posted by timguyli
If its a 94, why does he need a scanner? I have a 95 and its obd1. I just check the flashes of the check engine light. I thought it was 95 that transitioned over to obd2 and that the 3.8 has obd2 while 3.1, which i have, remained obd1 till the end of the model year.
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The ECM/PCM for 1994 and 1995 3800 still has GM ALDL 8192 baud OBDI communication, like before, but the codes are enhanced, and are more or less identical to the codes for later OBDII systems. Many people think this is OBDII, because the codes looks like it, but the real OBDII came with the new 3.4 in 1996. Because of this enhanced codes for 1994-1995, it is no longer possible to flash the codes.
The 3.1 had the older and slower GM ALDL 160 baud communication, and nothing was ever changed, not even for the last year. This makes it possible to flash the codes for all 3.1.