where is the pcm line?

[what2fast]

hey just got a lunar air/fuel guage from autometer. now i have every thing hooked up except the wire that gets T'd off to the PCM (powertrain control modual) if someone could point me in the direction of were this wire is at and how to go about on hooking it up thanks in advance.

 

[machinegun]

The older vehicles like our turbo buicks do not use a PCM but and ECM. There are some differences. In the TB community we refer to the ECM. Now that this is out of the way, you can do one of two things. You can either run the wire out to under the hood and tap in to the O2 wire there or look at the the wiring diagram at the below link to find the correct wire to tap into. Hope this helps.

http://www.gnttype.org/techarea/ecmsensors/ecmpins.html

 

[tminer]

We don't have a PCM, just an ECM. If you want the O2 sensor signal it is pin D7 and a purple wire. Should be the 7th connection on one side of the larger, 32 pin, connector. I think it is the only puple wire, but there is at least one purple with a white stripe.

Info courtesy of gnttype.org.

HTH,
Tom Miner