Originally Posted by moehorsepower

there is only 7 wires that are needed to communicate to the pcm, I have the schematic at home, I can look at it when I get there tonite unless someone here has the pin numbers of those 7 wires, actually only one is the data wire, two were power wires, and I think the rest were grounds....

Originally Posted by 97 SS LT1

Thanks! i was looking back at what he posted and it looks like #9 on the plug goes straight to the PCM for data...so if we check it for opens and shorts and it checks out good then it narrows it to the PCM...correct? just not sure what pin to check on the PCM plug?

Originally Posted by moehorsepower

Should be, you can use an ohm meter and ohm out the wire from the ALDL port to the harness, again, I can tell you later, I know the hots were like RED 18 & 22, I think the data blue 1 ect, I don't want to give you the wrong info now..

Originally Posted by moehorsepower

OK here they are:
Grounds:
Blue 1
Red 18 & 22

Data:
Blue 30

Hot:
Black 15
Black 30
Black 31

Originally Posted by moehorsepower

OK here they are:
Grounds:
Blue 1
Red 18 & 22

Data:
Blue 30

Hot:
Black 15
Black 30
Black 31