Logging External Sensors with Stock ECM
 

I've read the write ups and have successfully used the EGR input as a wideband AFR input for the stock ECU (for logging purposes) with HPTuners using pin 55 on the Blue connector

I have also used the Air Conditioning input on other cars. On say 99-02 camaros, pin 14 on the red connector is for the AC pressure sensor. They use a 0-5 volt sensor rather than the low/high switches like the trucks do.

I was wondering if I could use pin 14 on the red on my truck and still be able to see the incoming voltage on that pin to be able to log another sensor since I am already using the EGR and fuel tank pressure inputs for my dual widebands. If I can use the 14R pin, what parameter would I log (since typically this pin is not used).

Thanks! I hope someone else has tried this!

It depends what year your PCM is. 02+ truck PCMs also had pressure sensors for the AC, so that works fine. I think only 99-01 had the switches. If you have a DBW tb those also all have AC pressure signals and EGR. In HPTuners though sometimes the EGR functionality is removed with a custom 2bar or 3bar os.

I have a 99 or 2000 pcm. Drive by cable

This will he a nitrous car so 1 bar is just fine.

I don't have AC anymore so controlling it doesn't matter to me, I just want to be able to log through the pin

Get a 2002 dbc pcm

Well the physical pcm should be the same correct? 411 aka p01

If it's just the calibration that is different then I could just flash a different cal to the pcm I have now. But I was hoping to get away with not having to license another tune file and just have pin 14 work anyway

Maybe, but I think there were small hardware changes also.

May as well try it, should only take a minute. Put a AA, C, or D battery to it and see if it reads ~1.5v