Tis’ the HVAC Season

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   #1  

DrPeter

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Tis’ the HVAC Season

By: DrPeter

Intro:
In this Tech Tip I will be explaining some quick and easy diagnostic tips for the Volkswagen/Audi HVAC systems. We will be focusing on the systems that are diagnosable with the VCDS scan-tool. Even though the system designs maybe slightly different between brands and models, they are generally similar enough that we can diagnose them using the information contain herein. It is always advisable to use the current repair information and training materials available and understand the system that you are working on, a little time spent learning will save you a lot of wasted time fixing your mistakes when you could have been fixing the vehicle.

Warning:
Yep, got to say this stuff because frostbite hurts more when the flesh thaws and blindness caused by refrigerant gases blasting out at 400psi can really suck when trying to work on cars, so... As with any potentially hazardous system of the automobile, we must remember to follow all of the manufacture’s safety, caution and warning notices found in the Factory Repair information. Also pay attention to any local, state or government laws regarding properly trained and/or licensed personal when working with regulated materials, such as refrigerants. If you do NOT know what you are doing or have not been properly trained, STOP! HALT! ARRÊT ¡ALTO! 停止

Training:
I have been trained in many aspects of the automotive and commercial HVAC systems (and living in SW Florida helps, AC season 365). I suggest anyone who is working with the HVAC systems in the Automotive world to get the right training and certifications, in 1993 I became a member of http://www.macsw.org , Mobile Air Conditioning Society (MACS) Worldwide, went to the class and became certified, so I suggest to cover your butt!

Diagnose first, then fix:
Diagnosing the modern Volkswagen/Audi HAVC system can be a bit challenging at times, certainly not impossible and troubleshooting is now easier with newer HVAC Controllers having more diagnostic capabilities compared to older generations. Yes, I will try to do a small tech tip on the older MK4 systems, though these systems are not completely diagnosable with the VCDS tool.

Here are the quick and easy checks you can use to help identify the cause of the concern within the HVAC system.


1) Check the basics in the [08-Auto HVAC] controller with VCDS.
  • Address any fault codes accordingly, use the Ross-Tech wiki and or repair manual
  • Make sure Basic Setting are complete
  • Verify coding is correct
  • Check for correct part numbers or controller updates

2) Check the Measuring Value Blocks(MVBs) for the following (most MVBs will be labeled and you will be able to identify the data in the field):
  • Compressor shut off code
  • Refrigerant Pressure from the Sensor G65
  • Outside Temperature (filtered and unfiltered) (adjusted vs. not adjusted)
  • Evaporator Temperature
  • Vent Temperatures

3) Check actual Refrigerant pressure
  • The best way to check AC system pressure is to use a good quality AC Gauge set. Verify the system has pressure, because the Refrigerant Pressure Sensor G65 maybe incorrect and the MVB data could show a different pressure. Also remember what Jef says, check the charge, pressure will not indicate a full charge.
  • Learn how to read the gauges, it is like reading between the lines, it will tell you a lot!

4) Check for proper operation of cooling fans
  • In many vehicles an [01-Engine] [Output Test] will activate BOTH fans, if equipped
  • The HVAC system in many cases will not function when the fans have failed. Check ECM for codes too.

5) Check for damage:
  • Compressor shaft is spinning (shear hub is not damaged)
  • Wiring, connections’
  • Hoses, fittings and missing valve caps(primary seal)


Addition notes, tips:

On some 2006 to 2009 vehicles it may be necessary to reset the Temperature Sensor, this can occur when the AC controller or ambient temperature sensor were replaced. To reset the Temperature Sensor, drive the vehicle above 30mph or let the vehicle sit, engine idling, for about 20 minutes.

2012 and newer Jetta sedans may have a customer concern of A/C shutting off when coming to a stop. When checking the HVAC controller for the Compressor Shut off code, [12- Shut-Off requested by Engine Control] maybe found, this is usually considered normal, the ECM is programmed to command the HVAC controller to shut off the compressor to allow increased engine rpm/vacuum when braking, mostly when the engine is cold, pre-catalyst operating temperature.

If your compressor shut off code is [0], check the N280-Refrigerant Regulating Valve** valve, this is what regulates the amount of refrigerant that the compressor ‘pumps’ through the system. The N280-Refrigerant Regulating Valve activation signal can be checked with an incandescent light bulb in its place. Unplug the N280-Refrigerant Regulating Valve, connect a test bulb to the connector from the HVAC controller and start the vehicle, turn on the AC and watch for the activation command from the HVAC controller. If the bulb lights and the compressor had failed to operate prior, then the N280-Refrigerant Regulating Valve and/or compressor has most likely failed.



Here is a list of typical Compressor Shut off codes:
- 0 = Compressor ON
- 1 = Compressor OFF: Refrigerant Pressure too high (> 32 bar)
- 2 = compressor OFF: Basic setting not performed
- 3 = Compressor OFF: Refrigerant Pressure too low (< 2.0 bar)
- 5 = Compressor OFF: Engine Start Detection
- 6 = Compressor OFF: ECON Mode active
- 7 = Compressor OFF: A/C System / FAN OFF
- 8 = Compressor OFF: Outside Temperature too low (< 3.0 °C)
- 10 = Compressor OFF: Vehicle System Voltage too low (< 10.1 V)
- 11 = Compressor OFF: Engine Temperature too high (> 118 °C)
- 12 = Compressor OFF: Shut-Off requested by Engine Control
- 13 = Compressor OFF: Vehicle System Voltage too high (> 17 V)
- 14 = Compressor OFF: Evaporator Temperature too low
- 16 = Compressor OFF: Compressor Activation faulty
- 17 = Compressor OFF: No or implausible Signal Pressure Sensor
- 18 = Compressor OFF: Vehicle Speed Shut-Off
- 19 = Compressor OFF: Shut-Off requested by Central Electronics Control (Load Management)

(This list may vary form vehicle to vehicle, Example: The Audi A6 (4F) is different, so check your repair manual or Measuring Value Block pop-up)


The newer HVAC systems use a pressure sensor – G65, not a pressure switch. The G65 can send information about the refrigerant pressure to the HVAC controller, a pressure switch, like the F129 cannot.

  • Located in the same place as the F129, the G65 is different, yet does the same functions as the F129.
  • It uses a pressure sensor and a microprocessor to create a PWM (Pulsed-width Modulated) signal
  • Pin 1 & 3 provide Ground and Power, PWM signal is on Pin2.


Update: August 31, 2015

The following Information has been deemed useful:

- 2006+ Volkswagen New Beetle/Convertible, the N280-Refrigerant Regulating Valve is controlled by the ECM.
Use Measuring Value Block 135, 136 and 137 for information about,
... the Duty cycle of the coolant fan
... the Relay 1 for the coolant fan
... the coolant fan after-run
... Condition of the AC
... Condition of the AC Compressor
... A/C-Pressure
... Fan request from A/C-System




-2006 to 2010 Volkswagen New Beetle/Convertible.
Fault codes P2612 and P2613 - may caused by wiring connections and or wiring harness routing/damage.
see the Ross-Tech wiki page for more information.


19044/P2612/009746 - A/C Refrigerant Distribution Valve: Short to Ground



-2011 to 2015? Jetta and 2012 to 2015? Beetle - A/C Controller Basic Settings. (just in case you did not see the wiki page)

- 00898 - Control Circuit A/C Compressor: No or incorrect Basic Settings




Added Information (12 July 2016):

G65 Pressure vs. Temperature chart
(When key is on, engine is off, static system pressure)


15C - 59F - 4.0 bar
20C - 68F - 5.0 bar
25C - 77F - 6.0 bar
30C - 86F - 7.0 bar
35C - 95F - 8.0 bar
40C - 104F - 9.0 bar


Important to note about the G65 sensor:
- A reading of 0.0 bar would indicate an absolute vacuum
- At Sea Level (atmospheric pressure) the typical reading is 1.0 bar



**
Typical N280-Refrigerant Regulating Valve resistance (on working vehicle) = 10-12 Ω






Added Information (1 June 2018):

We strongly recommend NOT to plug the 'V51 - Coolant after run pump' connector to the N280-Refrigerant Regulating Valve.
-If this is done, the HVAC system will not cool the vehicle.


- This can happen, usually when there was repair work to the front of the vehicle.
Someone accidentally swaps the two connectors.

- There should be a fault code for the N280, see below example, mostly this happens with the 2.0L Volkswagen, where the connectors are close enough to each other so that they can be swapped.

Example from a 2011 Passat CC 2.0L(CBFA-engine)
This vehicle had a fault code in the [08-Auto HVAC] controller: B10A9-Control Circuit for A/C Compressor
N280 connector
Pin1 = br/sw
Pin2 = gn/sw

V51 connector
Pin1 = vi/rt
Pin2 = br






Well, hope this helps and remember to check your basics, that includes any technical service bulletins TSBs that may apply,



drpeter
 
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   #2  

Rich

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C?ID=159735
2009 A5 3.2 6 speed in AC hell. AC was working fine. Car sat idle for a few weeks, started car, no AC. Car has just over 75K miles, I have worked on my own AC for some time now as it seems every car I own has AC problems. I am not by any means an expert but I do okay, used to a 1967 Chrysler where if the compressor was bad you could pull the head on it and replace the reed valves. I am, however, a high mileage driver (put 290K on my 98 2.8 A4 stick, mostly NYC miles- two Denso compressors). Seems the A5 does not have an AC clutch, but rather a drive hub. I cannot see a wire going to it and cannot find one on the electrical diagram or a fuse for it (Bentleys). I could not get a signal going to the N280 Regulator valve with a Fluke VOM (Did read a small signal 0.07V DC, reading measuring blocks it was switching 0-.7 Amp reading 8.6 Bar). Bentleys calls for using an oscilloscope looking at the square wave, apparently runs off pulse width (PWM). Going through measuring blocks did not see much for labels of what I was looking at. I do take suggestions.
At stand still I am measuring about 85 PSIG high and low side with gauges which would appear to be a full charge, 80 deg. F.
I am posting the autoscan Previous fault codes were the right door lock, Headlight leveler, radio codes, (works fine), seat memory (who cares) and the left floorwell flap motor as below.
I hope I pasted this okay.
I sincerely appreciate any and all help. I am also going by Audi in the morning and will attempt to talk to a tech.
Rich

Code:
Wednesday,25,June,2014,18:40:36:42395
VCDS -- Windows Based VAG/VAS Emulator
VCDS Version: 12.12.2.0 (x64)
Data version: 20140212


VIN: WAUDK78T29A046369   License Plate: 
Mileage: 123280km-76602mi   Repair Order: 



--------------------------------------------------------------------------------
--------------------------------------------------------------------------------


Chassis Type: 8T (8T0)
Scan: 01 03 05 06 07 08 09 0E 0F 10 15 16 17 19 1E 36 37 3C 42 46
          47 52 53 55 56 65 67 6C 77

VIN: WAUDK78T29A046369   Mileage: 123280km/76602miles

01-Engine -- Status: OK 0000
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
05-Acc/Start Auth. -- Status: Malfunction 0010
06-Seat Mem. Pass -- Status: Malfunction 0010
07-Control Head -- Status: OK 0000
08-Auto HVAC -- Status: Malfunction 0010
09-Cent. Elect. -- Status: Malfunction 0010
0E-Media Player 1 -- Status: OK 0000
0F-Digital Radio -- Status: Malfunction 0010
10-Park/Steer Assist -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
1E-Media Player 2 -- Status: OK 0000
36-Seat Mem. Drvr -- Status: Malfunction 0010
37-Navigation -- Status: OK 0000
3C-Lane Change -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: Malfunction 0010
47-Sound System -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: Malfunction 0010
55-Xenon Range -- Status: Malfunction 0010
56-Radio -- Status: OK 0000
65-Tire Pressure -- Status: OK 0000
67-Voice Control -- Status: OK 0000
6C-Back-up Cam. -- Status: OK 0000
77-Telephone -- Status: OK 0000
 
-------------------------------------------------------------------------------
Address 01: Engine (J623-CALA)       Labels: 06E-907-559-CAL.clb
   Part No SW: 8T0 907 559 G    HW: 8T0 907 559 B
   Component: 3.2 SIMOS8.2  H04 0002  
   Revision: --------    
   Coding: 01140009180F0121
   Shop #: WSC 06325 000 00000
   ASAM Dataset: EV_ECM32FSI8T0907559G A01004
   ROD: EV_ECM32FSI8T0907559G.rod
   VCID: 4683ED7DF902762EE1B-8013

No fault code found.
Readiness: 0000 0000

-------------------------------------------------------------------------------
Address 03: ABS Brakes (J104)       Labels: 8K0-907-379.clb
   Part No SW: 8K0 907 379 AF    HW: 8K0 907 379 AF
   Component: ESP8 quattro  H04 0210  
   Revision: --------    Serial number: --------------
   Coding: 0D0500
   Shop #: WSC 06325 000 00000
   VCID: 7DF14291E454F5F6F01-8028

No fault code found.

-------------------------------------------------------------------------------
Address 05: Acc/Start Auth. (J393)       Labels: 8K0-907-064-05.clb
   Part No SW: 8K0 907 064 AG    HW: 8K0 907 064 AG
   Component: BCM2 1.1      H80 0145  
   Revision: 00002001    
   Coding: 0F0000
   Shop #: WSC 06325 000 00000
   VCID: 75E15AB1DC64ADB6B81-8020

   Subsystem 1 - Part No SW: 8K0 905 852 D    HW: 8K0 905 852 D
   Component: ELVAUDIB8  H36 0041 

2 Faults Found:
03286 - Sensor for Contact with Door Handle; Front Right 
            008 - Implausible Signal
             Freeze Frame:
                    Fault Status: 01101000
                    Fault Priority: 2
                    Fault Frequency: 109
                    Reset counter: 169
                    Mileage: 120204 km
                    Time Indication: 0
                    Date: 2014.05.01
                    Time: 18:39:55

03286 - Sensor for Contact with Door Handle; Front Right 
            007 - Short to Ground - Intermittent
             Freeze Frame:
                    Fault Status: 00100111
                    Fault Priority: 2
                    Fault Frequency: 4
                    Reset counter: 190
                    Mileage: 121778 km
                    Time Indication: 0
                    Date: 2014.05.16
                    Time: 18:41:37


-------------------------------------------------------------------------------
Address 06: Seat Mem. Pass (J521)       Labels: 8T0-959-760.clb
   Part No SW: 8T0 959 760 B    HW: 8T0 959 760 B
   Component: MEM-BFS       H09 0043  
   Revision: AA000000    Serial number: 00001001236533
   Coding: 08017025002400001000
   Shop #: WSC 06325 000 00000
   VCID: 428BF16DDD2A4A0ECD3-8017

1 Fault Found:
02095 - Component Protection Active 
            000 - - - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 2
                    Fault Frequency: 62
                    Reset counter: 255
                    Mileage: 119713 km
                    Time Indication: 0
                    Date: 2014.02.07
                    Time: 19:16:57


-------------------------------------------------------------------------------
Address 07: Control Head        Labels: 8T0-035-7xx-07-H.clb
   Part No SW: 8T0 035 729 M    HW: 4E0 035 729 A
   Component: Interfacebox    H43 4610  
   Revision: 00000000    Serial number: 340BK097519422
   Coding: 0005003
   Shop #: WSC 06325 000 00000
   VCID: 4385F46902304306C65-8016

   Subsystem 1 - Part No: 8T0 919 609 D
   Component: E0380 BedienteilH08 0100

   Subsystem 2 - Serial number: 00000000236262

   Subsystem 3 - Serial number: 0107.02.090000000100010532ˇ

   Subsystem 4 - Serial number: 010532ˇ

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC (J255)       Labels: Redir Fail!
   Part No SW: 8T1 820 043 AC    HW: 8T1 820 043 AC
   Component: KLIMA 3 ZONEN H06 0150  
   Revision: C1000000    Serial number: 01180220090164
   Coding: 46022000
   Shop #: WSC 06325 000 00000
   VCID: 72EB61ADAD0ABA8E9D3-8027

4 Faults Found:
00711 - Left Footwell Flap Positioning Motor (V108) 
            001 - Upper Limit Exceeded - Intermittent
             Freeze Frame:
                    Fault Status: 00100001
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 206
                    Mileage: 123042 km
                    Time Indication: 0
                    Date: 2014.06.22
                    Time: 13:02:44

             Freeze Frame:
                    Voltage: 14.00 V
                    Temperature: 24.0∞C
                    Temperature: 23.0∞C
                    Count: 15855
                    Count: 16291
                    Bin. Bits: 01000000
                    Bin. Bits: 10000001
                    Time: 29.00 s

00457 - Control Module for Network (J519) 
            013 - Check DTC Memory - Intermittent
             Freeze Frame:
                    Fault Status: 00101101
                    Fault Priority: 6
                    Fault Frequency: 1
                    Reset counter: 209
                    Mileage: 123284 km
                    Time Indication: 0
                    Date: 2014.07.23
                    Time: 14:03:46

00256 - A/C Pressure/Temperature Sensor (G395) 
            008 - Implausible Signal - Intermittent
             Freeze Frame:
                    Fault Status: 00101000
                    Fault Priority: 7
                    Fault Frequency: 1
                    Reset counter: 209
                    Mileage: 123284 km
                    Time Indication: 0
                    Date: 2014.07.23
                    Time: 14:03:46

             Freeze Frame:
                    Temperature: 27.0∞C

01592 - Air Quality Sensor (G238) 
            004 - No Signal/Communication - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 6
                    Fault Frequency: 1
                    Reset counter: 209
                    Mileage: 123284 km
                    Time Indication: 0
                    Date: 2014.07.23
                    Time: 14:04:44

             Freeze Frame:
                    Temperature: 27.0∞C


-------------------------------------------------------------------------------
Address 09: Cent. Elect. (J519)       Labels: 8K0-907-063.clb
   Part No SW: 8K0 907 063 D    HW: 8K0 907 063 D
   Component: BCM1 1.0      H24 0253  
   Revision: 05024001    Serial number: 00000000326538
   Coding: 26001091063CAF010000080300003D3D0F1C138800010161000000
   Shop #: WSC 06325 000 00000
   VCID: 306FABA56386C89E2B7-8065

   Subsystem 1 - Part No SW: 8T1 955 119 C    HW: 8J1 955 119   Labels: 1KX-955-119.CLB
   Component: WWS 090209  H13 0040 
   Coding: 00FD11

   Subsystem 2 - Part No SW: 8K0 955 559     HW: 8K0 955 559   Labels: 8K0-955-559.CLB
   Component: RLS  H04 0003 
   Coding: 02532C

   Subsystem 3 - Part No SW: 8K0 941 531 AC    HW: 8K0 941 531 AC
   Component: E1 - LDS  H07 0090 

   Subsystem 4 - Part No SW: 8K0 907 410 B    HW: 8K0 907 410 B
   Component: HOMELINK  H01 0010 

2 Faults Found:
00256 - A/C Pressure/Temperature Sensor (G395) 
            004 - No Signal/Communication - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 209
                    Mileage: 123284 km
                    Time Indication: 0
                    Date: 2014.07.23
                    Time: 14:03:00

01592 - Air Quality Sensor (G238) 
            004 - No Signal/Communication - Intermittent
             Freeze Frame:
                    Fault Status: 00100100
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 209
                    Mileage: 123284 km
                    Time Indication: 0
                    Date: 2014.07.23
                    Time: 14:04:00


-------------------------------------------------------------------------------
Address 0E: Media Player 1        Labels: 4E0-910-111.lbl
   Part No SW: 8T1 035 110 C    HW: 8T1 035 110 C
   Component: MP3-Changer     H43 0390  
   Revision: 00043003    Serial number: AUZ5ZBI8752472
   Shop #: WSC 00000 000 00000
   VCID: 2A5BB9CD855AB24EE53-807F

No fault code found.

-------------------------------------------------------------------------------
Address 0F: Digital Radio        Labels: 4E0-910-593-SIR.lbl
   Part No SW: 4E0 910 593 M    HW: 4E0 035 593 F
   Component: SDAR SIRIUS     H07 0160  
   Revision: 00000000    Serial number: AUZ4Z7I0517809
   Coding: 0000100
   Shop #: WSC 06325 000 00000
   VCID: 3169AEA1A88CC196249-8064

1 Fault Found:
02635 - Tuner Not Enabled/Activated 
            000 - -
             Freeze Frame:
                    Fault Status: 01100000
                    Fault Priority: 7
                    Fault Frequency: 5
                    Reset counter: 163
                    Mileage: 122742 km
                    Time Indication: 0
                    Date: 2014.06.20
                    Time: 19:02:41


-------------------------------------------------------------------------------
Address 10: Park/Steer Assist (J446)       Labels: 8K0-919-475.clb
   Part No SW: 8K0 919 475 F    HW: 8K0 919 475 
   Component: PARKHILFE 4K  H06 0040  
   Revision: 11001001    Serial number: 40140906201564
   Coding: 200001
   Shop #: WSC 06325 000 00000
   VCID: 3C778F95BFCE3CFE87F-8069

No fault code found.

-------------------------------------------------------------------------------
Address 15: Airbags (J234)       Labels: 8K0-959-655.clb
   Part No SW: 8K0 959 655 F    HW: 8K0 959 655 F
   Component: AirbagVW-AU10 H27 0410  
   Serial number: 0039KD14WFGR  
   Coding: 303333334330303030304A55304C38543053
   Shop #: WSC 06325 000 00000
   ASAM Dataset: EV_AirbaECUVWAUDI010 A02007
   ROD: EV_AirbaECUVWAUDI010_AU48.rod
   VCID: 408FFB65DB26581EDB7-8015

   Seat occupied recognition: 
   Subsystem 1 - Part No SW: 8K0 959 339     HW: 8K0 959 339 
   Component: BF-Gewichtss.  H01 0050 
   Serial number: 5810000R0900003B7Z

   Crash sensor for side airbag; driver side: 
   Serial number: 6334MSME45140D37A

   Crash sensor for side airbag; passenger side: 
   Serial number: 6344MSME454256415

   Crash sensor for side airbag; rear driver side: 
   Serial number: 6352QSME7E222F04N

   Crash sensor for side airbag; rear passenger side: 
   Serial number: 6362QSME15220018/

   Crash sensor for front airbag; driver side: 
   Serial number: 63732SME3C210D00U

   Crash sensor for front airbag; passenger side: 
   Serial number: 63832SME4A213B3C3

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel (J527)       Labels: 8K0-953-568.clb
   Part No SW: 8K0 953 568 F    HW: 8K0 953 568 F
   Component: Lenks.Modul   H16 0014  
   Revision: --------    Serial number: 90319IBN0006E 
   Coding: 000016
   Shop #: WSC 06325 000 00000
   VCID: 3D718291A4D435F6B01-8068

   Component: E221 - MFL  H02 0003 

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments (J285)       Labels: 8T0-920-xxx-17.clb
   Part No SW: 8T0 920 981 D    HW: 8T0 920 981 D
   Component: KOMBIINSTR.   H32 0224  
   Revision: 00200000    Serial number: 9D434VR29     
   Coding: 8B1501000B00D705020000
   Shop #: WSC 06325 000 00000
   VCID: 3D718291A4D435F6B01-8068

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway (J533)       Labels: 8T0-907-468.clb
   Part No SW: 8T0 907 468 Q    HW: 8T0 907 468 L
   Component: GW-BEM 5CAN-M H10 0095  
   Revision: FB600048    Serial number: 4800F092130010
   Coding: 000303
   Shop #: WSC 06325 000 00000
   VCID: 4FADC8591E78B76652D-801A

   Subsystem 1 - Part No SW: 8K0 915 181 E    HW: 8K0 915 181 E
   Component: J367-BDM  H06 0160 

No fault code found.

-------------------------------------------------------------------------------
Address 1E: Media Player 2 (R199)       Labels: 4E0-035-785.lbl
   Part No SW: 4E0 035 785 F    HW: 4E0 035 785 C
   Component: SG ext.Player H20 0850  
   Revision: 00000000    
   Coding: 020000
   Shop #: WSC 06325 000 00000
   VCID: 2B55BCC94AA0AB461E5-807E

No fault code found.

-------------------------------------------------------------------------------
Address 36: Seat Mem. Drvr (J136)       Labels: 8T0-959-760.clb
   Part No SW: 8T0 959 760 B    HW: 8T0 959 760 B
   Component: MEM-FS        H09 0043  
   Revision: AA000000    Serial number: 00001001237366
   Coding: 08197B25002400001000
   Shop #: WSC 06325 000 00000
   VCID: 428BF16DDD2A4A0ECD3-8017

1 Fault Found:
02095 - Component Protection Active 
            000 - - - Intermittent
             Freeze Frame:
                    Fault Status: 00100000
                    Fault Priority: 2
                    Fault Frequency: 33
                    Reset counter: 255
                    Mileage: 119713 km
                    Time Indication: 0
                    Date: 2014.02.10
                    Time: 13:36:05


-------------------------------------------------------------------------------
Address 37: Navigation        Labels: 4E0-910-88x-37.lbl
   Part No SW: 4E0 910 888 M    HW: 4E0 919 887 M
   Component: MNS US          H52 1100  
   Revision: 00000000    Serial number: 341BN097524482
   Shop #: WSC 06325 000 00000
   VCID: 387F93854BF610DE637-806D

No fault code found.

-------------------------------------------------------------------------------
Address 3C: Lane Change        Labels: None
   Part No SW: 8K0 907 566 B    HW: 4L0 907 566 B
   Component: J0769_SWA_MasterH01 0050  
   Revision: 00H01000    Serial number: 6PZ 009 014-13
   Coding: 0000004
   Shop #: WSC 06325 000 00000
   VCID: 36639DBD41E2E6AE71B-8063

   Subsystem 1 - Part No: 8K0 907 568 B
   Component: J0770_SWA_Slave_H01 0050

   Subsystem 2 - Serial number: 6PZ 009 014-33

   Subsystem 3 - Serial number: 5F27.02.0900H010003CD10153ˇ

   Subsystem 4 - Serial number: D10153ˇ

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver (J386)       Labels: 8K0-959-793.clb
   Part No SW: 8K0 959 793 D    HW: 8K0 959 793 D
   Component: TSG FA        H11 0250  
   Revision:             Serial number: 0000008546662 
   Coding: 011C13224E00120102
   Shop #: WSC 06325 000 00000
   VCID: 4189FE61D82C5116D49-8014

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv. (J393)       Labels: 8K0-907-064-46.clb
   Part No SW: 8K0 907 064 AG    HW: 8K0 907 064 AG
   Component: BCM2 1.1      H80 0145  
   Revision: 00002001    Serial number: 0116831091    
   Coding: 0106029A007A444500B000
   Shop #: WSC 06325 000 00000
   VCID: 75E15AB1DC64ADB6B81-8020

   Subsystem 1 - Part No SW: 8K0 959 719     HW: 8K0 959 719 
   Component: GTO BF  H06 0040 

   Subsystem 2 - Part No: 1K0 951 605 C
   Component: LIN BACKUP HO  H03 1301 

   Subsystem 3 - Part No SW: 8R0 959 591     HW: 8R0 959 591 
   Component: J245EE16SKB10  H01 0180 

2 Faults Found:
02615 - Fuel Tank Cap; Lock 
            009 - Open or Short to Ground
             Freeze Frame:
                    Fault Status: 01101001
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 207
                    Mileage: 111078 km
                    Time Indication: 0
                    Date: 2013.06.21
                    Time: 16:59:42

02616 - Fuel Tank Cap; Unlock 
            009 - Open or Short to Ground
             Freeze Frame:
                    Fault Status: 01101001
                    Fault Priority: 2
                    Fault Frequency: 11
                    Reset counter: 165
                    Mileage: 111078 km
                    Time Indication: 0
                    Date: 2013.06.21
                    Time: 17:00:24


-------------------------------------------------------------------------------
Address 47: Sound System (J525)       Labels: 8T0-035-223-BOM.clb
   Part No SW: 8T0 035 223 T    HW: 8T0 035 223 F
   Component: DSP Prem      H14 0400  
   Revision: 00H14003    Serial number: 34814004112301
   Coding: 030101
   Shop #: WSC 12336 024 394758
   VCID: 3F8DF899AED827E6A2D-806A

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass. (J387)       Labels: 8K0-959-792.clb
   Part No SW: 8K0 959 792 D    HW: 8K0 959 792 D
   Component: TSG BF        H11 0250  
   Revision:             Serial number: 0000008494927 
   Coding: 011C13224E00120102
   Shop #: WSC 06325 000 00000
   VCID: 408FFB65D326581EDB7-8015

No fault code found.

-------------------------------------------------------------------------------
Address 53: Parking Brake (J540)       Labels: 8K0-907-801-V1.clb
   Part No SW: 8K0 907 801 G    HW: 8K0 907 801 G
   Component: EPB Audi B8   H08 0080  
   Revision: 00000003    Serial number: 00000000319528
   Shop #: WSC 00000 000 00000
   VCID: 3365A4A99290F386565-8066

2 Faults Found:
02432 - Supply Voltage for Left Parking Brake Motor (V282) 
            011 - Open Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101011
                    Fault Priority: 1
                    Fault Frequency: 4
                    Reset counter: 28
                    Mileage: 115378 km
                    Time Indication: 0
                    Date: 2013.09.18
                    Time: 18:56:38

             Freeze Frame:
                    Voltage: 12.70 V
                    Count: 28
                    Speed: 0.0 km/h
                    Hex Value: 0x0163
                    Hex Value: 0x0008
                    Hex Value: 0x0101

02433 - Supply Voltage for Right Parking Brake Motor (V283) 
            011 - Open Circuit - Intermittent
             Freeze Frame:
                    Fault Status: 00101011
                    Fault Priority: 1
                    Fault Frequency: 4
                    Reset counter: 28
                    Mileage: 115378 km
                    Time Indication: 0
                    Date: 2013.09.18
                    Time: 18:56:38

             Freeze Frame:
                    Voltage: 12.70 V
                    Count: 29
                    Speed: 0.0 km/h
                    Hex Value: 0x0173
                    Hex Value: 0x0008
                    Hex Value: 0x0101


-------------------------------------------------------------------------------
Address 55: Xenon Range        Labels: 8T0-907-357.clb
   Part No SW: 8H0 907 357 A    HW: 8H0 907 357 
   Component: AFS 1           H01 0020  
   Revision: 00000001    Serial number:               
   Coding: 0000017
   Shop #: WSC 06324 000 00000
   VCID: 306FABA5A386C89E2B7-8065

   Subsystem 1 - Part No: 7L6 941 329 C
   Component: AFS-Modul links H01 0004

   Subsystem 2 - Part No: 7L6 941 329 C
   Component: AFS-Modul rechtsH01 0004

2 Faults Found:
00496 - Sensor for Vehicle Leveling; Front 
            010 - Open or Short to Plus - Intermittent
             Freeze Frame:
                    Fault Status: 00101010
                    Fault Priority: 2
                    Fault Frequency: 1
                    Reset counter: 210
                    Mileage: 111195 km
                    Time Indication: 0
                    Date: 2013.06.24
                    Time: 14:50:22

00496 - Sensor for Vehicle Leveling; Front 
            008 - Implausible Signal - Intermittent
             Freeze Frame:
                    Fault Status: 00101000
                    Fault Priority: 2
                    Fault Frequency: 5
                    Reset counter: 184
                    Mileage: 118874 km
                    Time Indication: 0
                    Date: 2013.12.12
                    Time: 11:41:07


-------------------------------------------------------------------------------
Address 56: Radio        Labels: 4E0-910-541.lbl
   Part No SW: 4E0 910 541 T    HW: 4F0 035 541 N
   Component: TUNER EU/US/RDW H42 0630  
   Revision: 00000000    Serial number: 357C.097524299
   Coding: 0000002
   Shop #: WSC 06325 000 00000
   VCID: 3169AEA1A88CC196249-8064

No fault code found.

-------------------------------------------------------------------------------
Address 65: Tire Pressure (J502)       Labels: 8K0-907-273.clb
   Part No SW: 8K0 907 273 A    HW: 8K0 907 273 A
   Component: J502-RDK      H03 0250  
   Revision: 00001001    Serial number: 13140790108965
   Coding: 0CD154
   Shop #: WSC 06324 000 00000
   VCID: 306FABA56386C89E2B7-8065

No fault code found.

-------------------------------------------------------------------------------
Address 67: Voice Control        Labels: 4E0-910-75x-67.lbl
   Part No SW: 4E0 910 754 Q    HW: 4E0 035 753 A
   Component: SDS 3501 US     H46 0630  
   Revision: 00000000    Serial number: 00000901290297
   Shop #: WSC 12336 024 394758
   VCID: 3467A7B5579EF4BE4FF-8061

No fault code found.

-------------------------------------------------------------------------------
Address 6C: Back-up Cam.        Labels: 4L0-910-441.clb
   Part No SW: 8T0 907 441 B    HW: 4L0 907 441 A
   Component: J772__Rearview      0070  
   Revision: --H12---    Serial number: 525PA8-J9190RN
   Coding: 1000008
   Shop #: WSC 06325 000 00000
   VCID: 377D90B946E81FA66AD-8062

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone        Labels: 4E0-910-336.lbl
   Part No SW: 4F0 910 336 H    HW: 4E0 862 335 
   Component: Handyvorb2      H20 1130  
   Revision: 00000000    Serial number: 00000005080854
   Coding: 0010900
   Shop #: WSC 06325 000 00000
   VCID: 285F43C59B56805EF37-807D

No fault code found.

End   ---------------------------------------------------------------------
 
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   #3  

jyoung8607

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I am posting the autoscan Previous fault codes were the right door lock, Headlight leveler, radio codes, (works fine), seat memory (who cares) and the left floorwell flap motor as below.
Your symptoms and your DTCs align closely with a known issue on that G395 sensor. Apparently it's common for the wiring to that sensor to fail or be damaged. Audi put out a TSB which you can find on AudiWorld thread attached to post #6.

You do have a stack of other interesting faults, and the above doesn't explain the G238 sensor error. Has the car been in a collision, or had water damage? The TSB indicates a probable wiring problem, but your damage location might not be one of the common ones.

Jason
 
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Rich

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Thanks, I'm trying to retrieve the TSB unsuccesfully, I am not a member of AudiWorld, I am not sure why I cannot access it from my ebahn bentleys manual.I emailed them. Audi took my VIN number and told me this morning there were no TSB's on the AC for the car.
Thanks again for your help.
Rich
 
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Rich

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Thanks I'm printing it out now. I was also going to call Ross Tech and pay for support to help me with analyzing the signals (if any), perhaps that's why I'm not getting the proper measuring block information.
Rich
 
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jyoung8607

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Thanks I'm printing it out now. I was also going to call Ross Tech and pay for support to help me with analyzing the signals (if any), perhaps that's why I'm not getting the proper measuring block information.
Rich
The "Labels: Redir Fail!" text in the address 08 scan means it found a pointer to where the label file should be, but could not find the label file itself. In your case, it's looking for the file 8Tx-820-043-3Z.CLB. I did a bit of Googling and it looks like VCDS has files similar to that in at least two regional translated versions of VCDS, but not in English. That leaves one of two possibilities: there was a packaging oops and the English label file didn't make it into the installer, or the initial label file work was done in a foreign language and hasn't been translated into English yet.

Either way, I suspect this is something Ross-Tech can help you with very easily.

Jason
 
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Rich

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Thanks The TSB had the wiring problem which looked like it, but the lines ring clear, power, signal and ground,(Fluke V-O-M)
Rich
 
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mikeme

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Any idea how the compressor load is calculated?

Specifically on a 1K0 820 047 HS Climatic PQ35 142 1111


Which sensors/values are used?
 
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jyoung8607

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Any idea how the compressor load is calculated?

Specifically on a 1K0 820 047 HS Climatic PQ35 142 1111

Which sensors/values are used?
It's not a measured or discovered input, it's a calculated and commanded output. It's just based on how much evaporator-to-condenser heat transfer Climatronic thinks is needed at any given time, depending on needs to cool down or dehumidify the cabin, or defog the windshield, etc.

Jason
 
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mikeme

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thanks,

kind of an intermediate value?



I logged some hvac controller info, and wonder what all to make of it.

does the load value then get blended with pressure reading and compressor speed to generate the control valve current?

is there some place this kind of detail is described?
 
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mikeme

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I have looked for an SSP with the Compressor load (in Nm) explained. my quest is unsuccessful. plenty of info on control systems, ducts, and even drive couplings.

I want to guess that this is really meant to communicate to the Engine control module an estimate of the idle load the compressor will apply, to feed engine control parameters.

on the bright side, my Refrigerant control valve (RCV) has started to stick a bit.
On starting after sitting for a while (overnight at least, perhaps less time is required) starting the car, then calling for max AC,

the current is maxed at 0.82 amps but the pressure remains ambient (7 bar or so) and the evaporator temperature does not decrease.
after a while, five or ten minutes, sometimes helped by turning ac off then on, the pressure increases (12 bar or so), followed by evaporator temp reducing,
and then by the passenger asking for the temperature to be adjusted.

but like the man with a roof that leaks only in the rain, I wait for cooler weather to tackle replacement of the RCV on my compressor.
 
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Dana

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SSP 881203 Heating, Air Conditioning and Climate Control Systems Operation and Diagnosis dates back to 2002 but they do mention "Denso externally controlled" compressors controlled by "A/C Compressor Regulating Valve N280". It goes on to mention "high frequency of 500 Hz" but it didn't get into much detail.

I searched for N208 in the 89G303 The Touareg Heating, Ventilation, and Air Conditioning Systems Design and Function -and- SSP 894303 The Phaeton Heating and Air Conditioning System Design and Function but they didn't include amperage info either.

I wouldn't doubt this info lives somewhere but at the present time your Engine and Auto HVAC feedback theory, like old-school power steering load signals sent to the engine, sounds entire plausible.
 
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Sebastian

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@mikeme, likely a bad compressor. The torque value is calculated, considering that yours doesn't move pretty much at all - have you checked the compressor clutch? You may want to post a complete Auto-Scan (preferrable in a seperate topic, so we can keep this one a bit cleaner) which also covers the VIN - there are a few RoW TPIs (and probably NAR ones too) which are likely relevant to your case.
 
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DV52

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SSP 881203 Heating, Air Conditioning and Climate Control Systems Operation and Diagnosis dates back to 2002 but they do mention "Denso externally controlled" compressors controlled by "A/C Compressor Regulating Valve N280". It goes on to mention "high frequency of 500 Hz" but it didn't get into much detail.

I searched for N208 in the 89G303 The Touareg Heating, Ventilation, and Air Conditioning Systems Design and Function -and- SSP 894303 The Phaeton Heating and Air Conditioning System Design and Function but they didn't include amperage info either.

I wouldn't doubt this info lives somewhere but at the present time your Engine and Auto HVAC feedback theory, like old-school power steering load signals sent to the engine, sounds entire plausible.
Dana: SSP 208 Air Conditioner in the Motor Vehicle is an interesting read - It suggests that clutch-less compressors are actually designed to operate at two set-points: what VW calls "High delivery rate for high capacity cooling" and "Low delivery rate for low capacity cooling". Does this vehicle have a "wobble-plate" style compressor and is the stability of the operation of the internal-regulating-valve fertile ground for further investigation - given that the results in the highlighted column in mike's table are largely two-state ?

Don
 
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mikeme

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Dana: SSP 208 Air Conditioner in the Motor Vehicle is an interesting read - It suggests that clutch-less compressors are actually designed to operate at two set-points: what VW calls "High delivery rate for high capacity cooling" and "Low delivery rate for low capacity cooling". Does this vehicle have a "wobble-plate" style compressor and is the stability of the operation of the internal-regulating-valve fertile ground for further investigation - given that the results in the highlighted column in mike's table are largely two-state ?

Don
Looks to me like page 18 of SSP_208_d1.pdf says:

All control positions between upper stop (100 %)
and the lower stop (approx. 5 %) are adapted to the required delivery rate
by altering the chamber pressure.

The two examples discussed in following pages are to allow comparison between higher and lower volume (and flow)

(this is similar to seeing discussions of thermostats. Open and closed are usually shown, but in reality, they continuously vary the degree of flow based on temperature within a range.)

This is in a discussion of internally regulated swash (aka wobble) plate compressors.

The compressor in my car, has that internal spring-controlled regulator replaced with an electrically operated valve, which performs similar control of the position of the swash plate, and thereby the volume of the compressor.

http://www.sanden.com/pistoncompressors.html provides some info on several compressor models.

the one in my 2009 Jetta TDI wagon is a Sanden PXE16

seems like the PXV16 is similar to the one shown in SSP 208 on page 17 as self regulating,

and the compressors described as fixed displacement are referred to in the SSP as non-self regulating


looking back at the data in the chart I posted http://forums.ross-tech.com/showthread.php?633-Tis%92-the-HVAC-Season&p=31379&viewfull=1#post31379 , the system was working pretty well, high side pressure went from ambient (around 7 bar which is around 100 psi, expected value for a system at rest around 90 degrees f)

and around ten seconds after start, the pressure is up to speed. (13 bar, 200 psi.) the pressure might be a little low, but it got there quick.
 
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