Morning All,
Working on finishing up my Vintage Air in stall on my C10. Engine and PCM are from a 2003 Yukon Denali.
Service #12582605
OS #12593058
MVPI 1
VCM 3.6.26 (it's what came with it and I've heard horror stories of bricked units so I left it be as it works)
My plan was to use the high pressure sensor to run the fans based on pressure and let the vintage air control the clutch. My rational was I have 2 fan, a 3-relay setup so I can run both a half speed and both at high speed, let the ecm run the low speed when pressure approaches 250psi, and if it keeps rising, enable the high speed. After reading this thread and that thread, I am starting to thinking this is not going to work as I had anticipated.
Last night, I hooked up the pressure sensor. I created a custom math to covert the PID to a pressure reading and can confirm that the ecm is seeing and reading pressure correctly. What I did to test my theory was hooked the sensor up, use my shop air and a blow gun with a rubber tip to apply pressure to the sensor. It shows in the scanner exactly what my shop air indicates. So in my tune, I changed the enable and disable pressures to 35/30 and 50/45 respectively to see if I applied pressure to sensor if it would turn the fans on. It did not. The truck was not running and VA was not on as I am still mid install. I had the ignition to run. Fan settings are based upon a 2001 F-body tune as a starting point to populate the cells.
First question, does the truck need to be running for this function to work correctly? I wouldn't see why it would, but figured it was worth asking.
Second question, reading both of these threads, it seems as though some P59's have the needed hardware, and some done. I am leaning towards mine doesn't but want to verify I am not missing something here?
Thank you all!