A/C unit is blowing warm air

Roy,

Tonight I tested the following after letting truck run for a few minutes to allow A/C pressure to stabilize (see attached picture), Freon seems a little low:

Low Side:
0v and 5v
jumped the low side connector, the compressor did not come on.

High side connector:
red = 0v
white=5v
black =0v

I also re-read the air conditioning not working article and am wondering if I have enough power at the low side sensor, the article indicates I need for 12v.

Where should I test next?
Should I add Freon to confirm the low side jump, I read the system needs to be at 25 psi for the test to work properly.

Thank you,
Bret

Roy,

I studied the schematic's further. How likely is it the climate control module is not sending the proper signals to the low side sensor and ECM? Should this be our next test?
Bret

Roy,
10-4. Blue gauge = 25 psi, red gauge = 110 psi.
Thanks,
Bret

Roy,

Since I started this project I have added two Carquest 12oz cans and 1-20oz A/C ProUltra Synthetic can of 134a. Outside temperature is 85-95 degrees, we are in Richmond, Virginia.
Bret

Roy,

10-4 on the synthetic. I added 1/2 the synthetic first several weeks ago before I bought the gauges you recommended. When the gauges arrived, I vacuumed the system down and added 1-12 oz can until I reached about 50 psi and then have added more, as necessary.
Bret

Roy,
The last time I added Freon I estimated I was in the 1.5 pound range and I recall you thought the PSI readings were in good shape. The blue is lower now then previously. My July 18th pressure readings were blue = 43 psi, red = 240 psi.
Bret

Roy,
The air is cold if I jump the relay but the compressor will not turn on unless its jumped. From what I can tell the compressor and overall system is fine just not getting the signal to turn on the compressor.
Bret

Roy,

I have 5v at the pressure switch and 1-5v line (white line) at the high pressure switch. I believe I need 12v at the low pressure switch and believe that may be the issue.
Bret

Roy,
At the high side, I do not. We expected the ECM to correct this but the results are the same.
Bret

Roy,

Do you want me to test the new ECM at pin #14 (ECM to battery ground) and from the high side red line to the ECM (pin to pin)?
Bret

Roy,

I tested the following with key in the on position:

1. Back probe with paper clip at pin 14 with harness plugged in 0v.
2. Removed harness, paper clip front of harness, 0v.
3. Pin to Pin - pin 14 to high side sensor red pin - 0 ohms, continuity should be good.

What do you recommend I test next?

Thank you,

Bret