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 '99 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!

 

Yes, you can use the AC pressure sensor (Red 14) on a truck OS. What you need to do is to "turn it on" by enabling the DTC (P0530). Then you would just log the A/C pressure sensor voltage.

 

I've never turned on the DTC and still use pin 14 to log AFR in HPTuners.
You can also use fuel tank pressure sensor pin 64 on the red connector as a 3rd option.

 

Thanks for the help guys! I appreciate your input