Automotive Air Conditioning Information Forum (Archives)

thomas.white on Mon December 29, 2014 3:25 PM

Year: 2012
Make: Ford
Model: Focus
Engine Size: 2.0
Refrigerant Type: 134a
Ambient Temp: 49
Pressure Low: 100
Pressure High: 100
Country of Origin: United States

Hello,

I have a 2012 Focus SEL with Electronic Climate Control. Suddenly, the A/C Compressor does not engage. Blower motor and all associated HVAC controls work.

1. Confirmed there is the proper amount (21.1 oz.) 134a Static is 100 PSIG both High and Low Side.
2. Confirmed Fuses #23 / #27 are good.
3. Confirmed Relay Operation
4. Confirmed Wiring and Connections
5. Confirmed PCM Command to Circuit
6. There are no codes for HVAC CAN indicated.
7. Transducer has 5VDC Ref Voltage, Signal, and Ground (Pin#1 4.8 VDC Pin#2 5.7 VDC Pin#3 4.8 VDC)
8. KOEO HVAC CAN Test shows no problems

I can power the clutch manually (-) Side with 12VDC, the compressor works as it should. If I cycle (manually) at about 28 PSIG it makes ice cubes.

You can review the scan data here. Maybe it will help: https://www.dropbox.com/s/bn3c5wwhra...ndata.jpg?dl=0

Anyone seen this prior?

Thanks! Link to Scan Data

Edited: Mon December 29, 2014 at 7:20 PM by thomas.white

mk378 on Mon December 29, 2014 7:42 PM

Swap out the relay. There is usually another relay in the box of the same type for the rear defogger or something which you can use for a test. Look for melted / burnt relay or fuse sockets.

thomas.white on Mon December 29, 2014 7:45 PM

Quote
Originally posted by: mk378
Swap out the relay. There is usually another relay in the box of the same type for the rear defogger or something which you can use for a test. Look for melted / burnt relay or fuse sockets.

Already done that.

mk378 on Mon December 29, 2014 8:07 PM

Next step would be to pull the relay and jumper across the two contact terminals (not the coil terminals) in the socket. If that doesn't make compressor engage, check that there is continuity from one terminal to a power source, and the other terminal to the compressor.

Edited: Mon December 29, 2014 at 8:09 PM by mk378

thomas.white on Mon December 29, 2014 9:39 PM

I've done all the troubleshooting in the Factory Manual.

Verified all wiring to the PCM and to the HVAC Electronic Controller Bus.

Removed, cleaned, and tested the entire circuit to include the Body Distribution Panels, PCM, and HVAC CAN Bus.

I've been on the phone with Engineering and they suggest replacing the HVAC CAN Module Board. I suggested the EVOS Temp Sensor. But, it's "periodically" loosing communications with the PCM during testing and shutting down (protection mode) the PCM when entering the HVAC CAN Test. It only does it on that specific test. It doesn't do it during an entire CAN Test. And, it does the same using an entirely different IDS VCM-II hardware and Cables. Other than that, they have no reference tickets for this condition on the Focus. But, sounds eerily similar to the Fusion - Hope not, they're a nightmare.

So, I took it down a bumpy road on a test drive and "thought it kicked in" for second but after reviewing the data it did not.

I'll post after the part comes in what the results are.

Until next Monday, I'll take whatever suggestions anyone has. Usually its an hour or so to diagnose and repair. This is pushing 8 + hours with no real results.