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Post by syafiqfox on Mar 29, 2023 16:00:56 GMT
Trying my luck if anyone here could help find a solution for mt AC issue on a golf mk7 1.4 2015. I been getting B10F000 - compressor switch-off by ECM (switch off code: 12) for the longest time. Im aware that ECM usually switch-off the AC compressor if the engine demand is high. Hence, explain the meaning of switch off code: 12. However, for my case, i was just cruising on a stright road with low RPM (1500-1800rpm) and the AC compressor will randomly switch-off. Compressor will resume whenever i let go off the gas. Pedal. I recently replaced my AC compressor and did compressor run in. Sadly, issue still persist. Anybody had experience similar issue and got it fixed?  |
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Post by syafiqfox on Sept 30, 2023 6:40:13 GMT
Bump
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Post by dv52 (Australia) on Sept 30, 2023 21:07:48 GMT
syafiqfox: Difficult to say without looking at the complete SCAN report (with Freeze frame data activated - so we can see the ancillary fault information) If you are not aware of how to digitize SCAN data - do this:  When you receive the Email that you sent to yourself, add the contents into a new post (as an attachment) Don
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Post by syafiqfox on Oct 1, 2023 10:29:28 GMT
Hi DV52, i have re-scan with Freeze frame included;
OBDeleven data log
Date: 2023-10-02 16:13
VIN: WVWZZZAUZFW175021
Car: Volkswagen Golf
Year: 2015
Body type: 5-dr hatchback
Engine: CXSA
Mileage: 174739 KM
---------------------------------------------------------------
01 Engine
System description: R4 1.4l TFS
Software number: 04E906016DF
Software version: 9024
Hardware number: 04E907309A
Hardware version: H10
ODX name: EV_ECM14TFS01104E906016DF
ODX version: 002007
Long coding: 01250032232415083000
Trouble codes:
No trouble codes found
---------------------------------------------------------------
02 Transmission
System description: GSG DQ200-MQB
Software number: 0CW300047D
Software version: 5230
Hardware number: 0AM927769K
Hardware version: H43
Serial number: CU501410135550
ODX name: EV_TCMDQ200021
ODX version: 001001
Long coding: 0014
Trouble codes:
No trouble codes found
---------------------------------------------------------------
03 Brakes
System description: ESC
Software number: 3Q0907379F
Software version: 0609
Hardware number: 3Q0907379F
Hardware version: H42
Serial number: 63024000001795
ODX name: EV_Brake1UDSContiMK100IPB
ODX version: 034027
Long coding: 01FA8AA1242711710777060241C42980512488E0608294F30022503AD202
Trouble codes:
No trouble codes found
---------------------------------------------------------------
08 Air Conditioning
System description: Climatronic
Software number: 5G0907044AN
Software version: 0907
Hardware number: 5G0907044AN
Hardware version: H03
ODX name: EV_ACClimaBHBVW37X
ODX version: 003018
Long coding: 00120024100100001005004000101802
Trouble codes:
B10F000 - Function limitation due to compressor switch-off by engine
Intermittent
Date: 2023-10-02 15:54:00
Mileage: 174726 km
Priority: 6
Malfunction frequency counter: 2
Unlearning counter: 52
Dynamic environmental data: 028680260016
---------------------------------------------------------------
09 Central Electrics
System description: BCM MQBAB H
Software number: 5Q0937084AJ
Software version: 0137
Hardware number: 5Q0937084AJ
Hardware version: H18
Serial number: 01011431003404
ODX name: EV_BCMCONTI
ODX version: 013000
Long coding: 03111A46C24122FB0BA44080B10C0728180E000000000000000000000000
Subsystems:
System description: WWS 141030
Software version: 0551
Hardware version: 042
Serial number: 141103115156
Long coding: 0E4DDD
System description: RLHS
Software version: 0059
Hardware version: 037
Serial number: S5Y14M11D14H06M18S32
Long coding: 06A8DD
System description: Sensor, DWA
Software version: 0315
Hardware version: 005
Serial number: 000000000ZY1430228UF
System description: Sirene, DWA
Software version: 0311
Hardware version: 004
Serial number: 00000000000060944207
System description: J245 PS73.404
Software version: 0003
Hardware version: H02
Serial number: 0000FST0000ZJAS00000
Long coding: 181901
Trouble codes:
No trouble codes found
---------------------------------------------------------------
15 Airbag
System description: AirbagVW20
Software number: 5Q0959655AA
Software version: 0386
Hardware number: 5Q0959655AA
Hardware version: 014
Serial number: 003MLR0A59CN
ODX name: EV_AirbaVW20SMEVW37X
ODX version: 002130
Long coding: 98CCC000000000005C0000CF00C800000065
Subsystems:
System description: BeltPretRevFL
Software version: 0350
Hardware version: H36
Serial number: 34169677B06111441343
Long coding: 333135
System description: BeltPretRevFR
Software version: 0350
Hardware version: H36
Serial number: 34169676B04111491298
Long coding: 333135
System description: SideSensor_Df
Software version: 0887
Hardware version: 001
Serial number: 3576700000018490B11K
Long coding: 2D2D2D
System description: SideSensor_Pf
Software version: 0887
Hardware version: 001
Serial number: 3586700000097428811Q
Long coding: 2D2D2D
System description: SideSensor_Dr
Software version: 6149
Hardware version: 001
Serial number: 3516502C51860BA61286
Long coding: 2D2D2D
System description: SideSensor_Pr
Software version: 6149
Hardware version: 001
Serial number: 35265029D1860BC2B1DO
Long coding: 2D2D2D
System description: FrontSensor_D
Software version: 6149
Hardware version: 001
Serial number: 3556502C7188FC04B18R
Long coding: 2D2D2D
Trouble codes:
No trouble codes found
---------------------------------------------------------------
16 Steering Column
System description: Lenks. Modul
Software number: 5Q0953507EA
Software version: 0110
Hardware number: 5Q0953549C
Hardware version: 002
Serial number: 26101404401488
ODX name: EV_SMLSKLOMQB
ODX version: 017001
Long coding: 0410
Trouble codes:
No trouble codes found
---------------------------------------------------------------
17 Dashboard
System description: KOMBI
Software number: 5G1920740
Software version: 4270
Hardware number: 5G1920740
Hardware version: 204
ODX name: EV_DashBoardVDDMQBAB
ODX version: 009037
Long coding: 27A501182B908008010017001400000000000000
Trouble codes:
No trouble codes found
---------------------------------------------------------------
19 Gateway
System description: GW MQB High
Software number: 5Q0907530AC
Software version: 1204
Hardware number: 5Q0907530F
Hardware version: 128
Serial number: 0002666824
ODX name: EV_GatewLear
ODX version: 011020
Long coding: 030100042F085700FF00024E1C0F00010001050000000000000000000000
Subsystems:
System description: J367-BDMHella
Software version: 8050
Hardware version: H04
Serial number: 7071935705
System description: E221__MFL-DC1
Software version: 0101
Hardware version: H06
Serial number: 29130000037240063351
Long coding: 29FFFF
Trouble codes:
No trouble codes found
---------------------------------------------------------------
2B Steering Column Lock
System description: ELV-MQBA
Software number: 5Q0905861A
Software version: 0120
Hardware number: 5Q0905861A
Hardware version: H01
Serial number: 14000310666003
ODX name: EV_ELVMarquMQB
ODX version: 004111
Long coding: 5D00000000000000
Trouble codes:
No trouble codes found
---------------------------------------------------------------
42 Driver Door
System description: TSG FS
Software number: 5Q0959593D
Software version: 0028
Hardware number: 5Q0959593B
Hardware version: 020
Serial number: 10111402080260
ODX name: EV_DCUDriveSideEWMAXKLO
ODX version: 006003
Long coding: 003D1220D001048000001000
Subsystems:
System description: FOND_FHSG_DRV
Software version: 0005
Hardware version: 005
Serial number: 00000000000004409635
Long coding: 1D0000
Trouble codes:
No trouble codes found
---------------------------------------------------------------
44 Steering Assistance
System description: EPS_MQB_ZFLS
Software number: 5Q0909144R
Software version: 1061
Hardware number: 5Q0909144R
Hardware version: 125
ODX name: EV_SteerAssisMQB
ODX version: 012140
Long coding: 8302
Trouble codes:
No trouble codes found
---------------------------------------------------------------
52 Passenger Door
System description: TSG BFS
Software number: 5Q0959592D
Software version: 0028
Hardware number: 5Q0959592B
Hardware version: 020
Serial number: 05111406070798
ODX name: EV_DCUPasseSideEWMAXKLO
ODX version: 006003
Long coding: 003D1020DE01048000801000
Subsystems:
System description: FOND_FHSG_PSG
Software version: 0005
Hardware version: 005
Serial number: 00000000000004305048
Long coding: 050000
Trouble codes:
No trouble codes found
---------------------------------------------------------------
55 Headlight Regulation
System description: AFS-ECU
Software number: 7P6907357D
Software version: 0090
Hardware number: 7P6907357A
Hardware version: H07
Serial number: --------------
ODX name: EV_HeadlRegulVWAFSMQB
ODX version: 001120
Long coding: 029A00000B010200
Subsystems:
System description: LeiMo links
Software version: 0002
Hardware version: H01
Long coding: 2E0000
System description: LeiMo rechts
Software version: 0002
Hardware version: H01
Long coding: 2E0000
Trouble codes:
No trouble codes found
---------------------------------------------------------------
76 Parking Assistance
System description: PARKHILFE PLA
Software number: 5Q0919298F
Software version: 0047
Hardware number: 5Q0919298
Hardware version: H12
Serial number: 39431426701791
ODX name: EV_EPHVA2CAU3700000
ODX version: 003019
Long coding: 0131151051
Trouble codes:
No trouble codes found
---------------------------------------------------------------
B7 Start System Interface
System description: VWKESSYMQB
Software number: 5Q0959435A
Software version: 0604
Hardware number: 5Q0959435
Hardware version: 021
Serial number: 0352062362
ODX name: EV_KessyHellaMQBAB
ODX version: 002011
Long coding: 030C0C
Trouble codes:
No trouble codes found
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Post by dv52 (Australia) on Oct 1, 2023 22:17:53 GMT
syafiqfox : hmm......... I had assumed that you would have activated Freeze-frame data (read THIS) - but apparently not!! Alas the report contains no additional information (at least from my reading of the SCAN)
IMO, OBD11's management of Freeze-frame is deficient compared to its competitor device VCDS. In VCDS, the Freeze-frame function is turned-ON as default whereas on OBD11 it's turned-OFF. The VCDS approach is superior!
I've no idea why a user of a diagnostic device would want to turn-OFF this valuable data stream in a SCAN report. It just doesn't make sense that anyone scanning the car for errors would want to hide data related to the environment on the car when a fault occurs - it's sheer lunacy!!
Anyhow- rant over!! Notwithstanding that your SCAN contains no Freeze-frame data, if this information has been recorded- it will be resident in the module's fault memory. So - maybe activate the function in OBD11 and make a fresh SCAN - does the new SCAN contain any additional data that's worth sharing?
As for the intermittent error recorded - there could be many reasons for the cause (intermittent faults are notoriously difficult to diagnose). I suspect that investigating this problem will be one of sequentially eliminating guesses and carefully noting the conditions on the car when the fault re-appears (as you have already done in your first post).
As a starting point for investigation - perhaps consider the operation of the cooling fan? Of course this is a guess - but you can monitor the behavior of the fan in Live Data for the 08 Air conditioning module. Type "fan" into the search box and select the following: - Coolant fan activation, actual value
- Coolant fan activation, specified value
Maybe observe the functioning of these parameters when the intermittent B10F000 fault occurs?
Again, this is a guess - but you have to start somewhere!! 
Don
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Post by syafiqfox on Oct 2, 2023 9:46:47 GMT
Hi DV52, i re-scan with freeze frame activated and re-edit my previous reply with freeze frame included. Apologize as i didnt know the functions exist.
I tried many methods to get the bottom of this AC intermittent issue. Tried replacing G395, temp and pressure sensor, expansion valve (i think also called orifice valve, replacing compressor. But nothing seems to works.
You mentioned that i should also look into the coolant fan. What are the symptons that the cooling fans is failing?
I did some experiment today. I found that the cooling fan runs when AC is on, and coolant fan stop running as soon as the AC is turned off. During driving, at low speed, the fan is running (fluctuate between 40%-50%, actual value) but at highway the fan will not run or stay at 10%. Are the operation i mentioned above normal?
Im looking to find other possibilities,perhaps bad condenser, cooling coil etc. The frequency of the intermittent issue is gettng more and more and i cant figure out the root cause.
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Post by dv52 (Australia) on Oct 3, 2023 0:50:20 GMT
syafiqfox : hmm...... as I have said "intermittent faults are notoriously difficult to diagnose". My suggestion regarding the cooling fan is just a guess. My hypothesis is that if it's NOT operating correctly, the AC system will run inefficiently and therefore it will place greater work requirements on the engine.
I can't comment on the fan ON/OFF percentages in your post because the behavior of the fan varies greatly with region, humidity and temperature. In theory, it is reasonable for the cooling fan to run less often when traveling at higher speed because natural cooling happens through the open vents to outside air. You could try using the re-circulation mode - that way no exterior cooling occurs. With this set-up, it shouldn't matter what speed the car is traveling-at.
The important aspect of the Freeze-frame data for your purpose is Fault Frequency. This metric indicates how many times the same error has been re-registered in fault memory in subsequent ignition cycles.
Also, what are you noticing with the 2 x Live data readings that I suggested?
Don
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Post by syafiqfox on Oct 3, 2023 3:29:51 GMT
Dv52- Always looking forward for your reply. Feels like im one step closer solving my problem. Can i check, the recirculation mode you reffering to is the recirc button on the climatronic module/panel or its some adaptation i need to perform. Also, i actually tried the live data you suggested; this was taken when cruising on highway (below 2000rpm). The live reading for coolant fan activation, specific value actually shows "0" (not shown in image below). I included live data of the refrigerant pressure as i also suspect this could also cause the intermittent issue due to low refrigerant pressure (i think).  |
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Post by syafiqfox on Oct 3, 2023 11:10:00 GMT
DV52 - i was browsing thru the adaptation list in the climatronic control unit and chance upon this, "ignore compressor switch-off by ecm";. I select "no switch off"; and it seems to stop the intermittent issue. Afraid that it might cause more harm, i revert back to the original settings. By anychance you might have some knowledge on what this adapation does and will enable the function, "no switch off" can do any malfunction?   |
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Post by dv52 (Australia) on Oct 3, 2023 20:52:43 GMT
First - my bad about the re-circulation suggestion - I confused the blower fan and the coolant (radiator) fan(s)!! Regarding your screenshot and words about low refrigerant pressure - the following information might be of interest
I thieved the first picture from VW's SSP 208 Air Conditioner in the Motor Vehicle which can be downloaded HERE. As you can see from the chart, 7.6 Bar is within the working range albeit it is a tad on the low-side.
I can't recall where I first obtained the lower picture - but it's from my database of AC stuff. 7.6 Bar = 110 PSI!
As for "ignore compressor switch-off by ecm" - I've not played with this adaptation channel in the past. Clearly it does what it says - but changing the factory setting simply deals with the effect-of-the-intermittent-fault, rather than the cause-of-the-intermittent-fault. Given that your objective appears to be the latter - cloaking the error message via this adaptation channel seems to be entirely antithetical to your efforts (IMO, of course)!!
Don
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Post by syafiqfox on Oct 7, 2023 2:07:59 GMT
DV52 - sorry for the late response and appreciate the useful information you pulled out for my diagnostics. Was doing some research regardig this issue and chance upon another forum (discussion about passat's enthusiat). I read a post from a guy that had similar symptons and issue as me. Link below; www.passatworld.com/threads/intermittent-ac.582357/If you were to browse the forum till the last post, he shared that he had closure with his issues. Turn out the fan MODULE was faulty and replacing the fan (althought the fan was working fine) solve his issue. Apparently, his module sending the incorrect signal and the car turning off the compressor as a protection feature. Now im contemplating whether to change the fan as this replacement may be costly and will guarantee the fix. Is there a way to monitor the operation of a faulty fan module? |
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Post by dv52 (Australia) on Oct 7, 2023 23:30:45 GMT
hmm..... the Radiator fan module (J293) does not directly participate on the CAN network - it's a LIN device that is a slave control unit to the ECU. So, I don't believe that it's possible to directly monitor the functioning of J293 - the diagnostic bus only reports errors in the module (which I assume has not happened on this car). There are radiator fan measurements in Live data in the engine module - but these are outputs from the coolant system peripherals Again. intermittent faults like this are tricky to trace. It really depends on what version J293 is installed on this car - it varies greatly as the module is available in various designs (sometimes fitted to the radiator fan). Don |
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tommi
New Member
Posts: 8
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Post by tommi on Oct 22, 2023 21:26:09 GMT
I was chasing B10F000 - compressor switch-off by ECM all summer. Got compressor shutdown as fast as I was not engine breaking. In my case it was the vacuum sensor in brake system which gave a weak vacuum value. Have you checked yours?
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Post by syafiqfox on Oct 30, 2023 13:43:37 GMT
Tommi - Thanks for sharing the info. Apparently, i have not yet check the sensor. And the problem you facing is kind of similar (i hope). Im willing to try anything to solve this issue.
by the way, did you replace the sensor and resolve the issue? If yes, can share some details on where i can find this sensor in the engine bay, and also the part number. Please
Thanks in advance
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tommi
New Member
Posts: 8
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Post by tommi on Nov 2, 2023 20:28:17 GMT
Replacing the faulty sensor solved my problem.
Follow the black pipe from the brake booster and you should find the sensor.
The piping is a bit different depending of engine type.
You can monitor the vacuum value with live data in control module 03 brakes.
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Post by syafiqfox on Nov 3, 2023 10:19:09 GMT
Tommi - appreciate the response. I just got a replacement brake booster pressure sensor,5Q0 906 207 B (I hope i gotten the right part) from my local dealer. Will swap and share if it solve the issue  |
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Post by syafiqfox on Nov 5, 2023 13:32:39 GMT
Hi Tommi - Thanks to you, i finally got my issue sorted out (like almost two years!). The brake booster vacuum sensor that you shared being defective help me uncover the issue.
After I replaced the sensors, issue still persist. However,this gave a potential hint that the vacuum hose has sign of vacuum leak(Since new sensors and old sensor shows same reading in live data)
Turn out the connection joint (like a socket/spigot) hose right after the non-return valve, where the sensor mounted was not seated properly. Thus, the leak! Tuck them back(prior to cleaning the connection joint) with some finger power solve my issue completely. Its been two days and fault has not resurfaced, which i can confirm issue was fix!
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tommi
New Member
Posts: 8
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Post by tommi on Nov 5, 2023 17:33:30 GMT
Great! Two years without A/C must have been a pain. I suffered alot during the four months I spent finding my fault.
It is truly interesting that brake vacuum affects A/C. Enjoy the coolness!
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