Sorted - AC trouble

PlasticMac said:
OK, you'll need the new label file.
Depending on your operating system, you may see an error message when you select the HVAC Controller, "Too Many Communication Errors"
I had this error yesterday, using Windows 10. Other controller were fine. There are several comments on here about similar experiences with the HVAC Controller.
I'm not an expert on these things, but it seems to be related to the Serial/USB Driver that the OBD Cable uses. Older drivers seem OK, while later version are not. My Windows 10 laptop, with the latest FTI official driver, didn't work with the HVAC Controller, while my very old XP laptop works no problem.
So, after a bit of Googling, I downloaded the driver pack from Ross-Tech, extracted the zip file, then went to Device Manager>Update Driver>Update Manually, and installed the appropriate driver from the extracted files.
That sorted the problem, as the screen shots I posted earlier show.
Mac.
Download here:
Click to expand...
Thank you, very helpful once again! I finally managed to get VCDS Lite to work. I got the “too many communication errors” message, but then I set latency to 2 and it worked. It seems my compressor is shut down due to a too low pressure reading from the G65 sensor..which is 1 bar. Also the N280 valve is at 0%. Not sure what to make of this… does that mean the system leaked again, or is the G65 faulty? ATS guy said there were no leaks..
F396DFD7-7DB6-4E93-ACE8-4B98E675FAD1.jpeg
 
I also cleared old fault codes and got a new one - 00819 - High pressure sensor (G65) 30-00 open or short to plus
 
Sounds like a faulty G65.
The N280 is at 0% as there's no cold refrigerant to circulate, I think.
Use Denso, or other top notch sensors only.
Hopefully, others on here can advise you.
Mac.
 
I have the same problem with communication error with the hvac module. I have installed new ross-tech drivers. Where do I set the latency? I cannot find it the vcds lite program options.
 
After some google I found how to set the latency. It was not in vcds. Now I have contact and I have 5 faults. At least the first 4 has to do with the hvac.
5 Faults Found:

01271 - Positioning Motor for Temperature Flap (V68)

41-10 - Blocked or No Voltage - Intermittent

00819 - High Pressure Sensor (G65)

29-10 - Short to Ground - Intermittent

00818 - Sensor for Evaporator Outlet Temperature (G263)

30-00 - Open or Short to Plus

01273 - Fresh Air Blower (V2)

17-10 - Control Difference - Intermittent

00975 - Heated Rear Window (Z1)

36-00 - Open Circuit
 

Attachments

BJohan said:
After some google I found how to set the latency. It was not in vcds. Now I have contact and I have 5 faults. At least the first 4 has to do with the hvac.
5 Faults Found:

01271 - Positioning Motor for Temperature Flap (V68)

41-10 - Blocked or No Voltage - Intermittent

00819 - High Pressure Sensor (G65)

29-10 - Short to Ground - Intermittent

00818 - Sensor for Evaporator Outlet Temperature (G263)

30-00 - Open or Short to Plus

01273 - Fresh Air Blower (V2)

17-10 - Control Difference - Intermittent

00975 - Heated Rear Window (Z1)

36-00 - Open Circuit
Click to expand...
Have you cleared those faults?. They may be historic if not. Clear them, then run the car and AC for a short while, and scan again.
Mac.
 
After clearing the faults only the G263 remains. At least the rest did not come back at once. The cabin fan lives its own life, going up and down in speed. I have read that it can be due to a faulty fan resistor? Also the defroster flap does not work so I need a new flap motor. I will replace this togerher with the G263 sensor.
 
BJohan said:
After clearing the faults only the G263 remains. At least the rest did not come back at once. The cabin fan lives its own life, going up and down in speed. I have read that it can be due to a faulty fan resistor? Also the defroster flap does not work so I need a new flap motor. I will replace this togerher with the G263 sensor.
Click to expand...
Unplug the G263, clear the fault, and scan again. If the same
"Open or Short to Plus" fault returns, it may not be the sensor.
Check the wiring at the back of the loom connector, that plugs into the G263. Condensation can form and cause corrosion, and wire failure.
Erratic behavior of the fan motor could be a faulty motor, or a faulty connector to the motor.
Mac.
 
PlasticMac said:
I've just done a bit of tidying up of the label file, and checked it out on my FSI, using Windows 10, and USB Serial Driver from Ross-Tech, not the official MS ones. The HVAC controller is a bit weird about drivers and operating systems. If you find comms is a problem, then try the Ross-Tech driver. Set Latency to 2 also.
I've attached the updated label file, and a screen shot of Groups 001, 002, & 003, with AC On, (top), and Off, ECON, (bottom).
Mac.
Click to expand...

Out of interest - when I was looking at my project car's a/c system last weekend with full VCDS, no label file name was present and most of the measurement boxes had no annotation - suggesting that uploading this label file will make the information more easy to understand with context. If I take the above zip file (downloaded on my MacBook), and do a USB stick transfer of the contents to my non-internet car diagnostics PC laptop, where do I transfer the files to within the PC file structure / VCDS directories?

Many thanks for providing these files and commentary - it is much appreciated.
 
Robin_Cox said:
Out of interest - when I was looking at my project car's a/c system last weekend with full VCDS, no label file name was present and most of the measurement boxes had no annotation - suggesting that uploading this label file will make the information more easy to understand with context. If I take the above zip file (downloaded on my MacBook), and do a USB stick transfer of the contents to my non-internet car diagnostics PC laptop, where do I transfer the files to within the PC file structure / VCDS directories?

Many thanks for providing these files and commentary - it is much appreciated.
Click to expand...
They go in the folder titled "Labels"
In VCDS Lite, it's a sub folder of VCDS Lite.
Mac.
 
Robin_Cox said:
In full VCDS I imagine it would be similar? I have both.
Click to expand...
Yes, I'm sure it will be.
I think the HVAC label file is already present in full VCDS, but, maybe in German language? Take a look in the label folder first find the file with the same name, and open it. It'll open in Notepad. See what language it is. If it is German then replace it with the new version. Only having Lite, can't be sure.
Mac.
 
PlasticMac said:
Unplug the G263, clear the fault, and scan again. If the same
"Open or Short to Plus" fault returns, it may not be the sensor.
Mac.
Click to expand...
If unplugging the connector the result will be the same; open circuit, per definition. No conclusion about the sensor can really be made. But once one has unplugged the connector it is just a one minute job to change the sensor.
 
Joga said:
If unplugging the connector the result will be the same; open circuit, per definition. No conclusion about the sensor can really be made. But once one has unplugged the connector it is just a one minute job to change the sensor.
Click to expand...
Only if you have bought another sensor though ...
Mac
 
The defroster flap doesn't work. There is no air at the windscreen. But no error code on the actuator. Strange.
 
Joga said:
Is this after you have changed the defroster actuator? Thinking if it isnt mechanically back in the right position?
Click to expand...
You can check if the V107 defrost flap actuator is moving by looking at VCDS, HVAC, Group 004.
As @Joga suggests, if you have no errors, it's probably out of position, misaligned gear?
Mac.
 
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