Audi A6 4f, 2006 3.0TDI with ACC++, How to zero dual brake pressure sensors?

   #1  

pviken

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VCDS Serial number
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Hi

Have an A6 4f 2006 with ACC, and these do have extra brake pressure sensors due to the ACC. The problem is not a faulty one in the ABS unit, but that I have somehow gotten an offset between the two sensors. One is fine and strats out at 0 bar, but the other one is starting off at a negative pressure.
No lamps lit in dashboard, but ACC diables due to DTC in ABS. Car brakes with perfect symmetry, so there is no air or anything causing this.
Feels like the VagCom misses a function to just zero these two sensors to 0 bar when no pressure is applied in the circuits.
Or do the sensors get zeroed as part of a procedure I have not found yet?
Have to admit that I suspect that I may have caused this myself from VagCom. Could be that I accidentally snugged the brake pedal while testing one of the functions in the ABS section of VagCom (cramped car, moved position in the seat).
Did'nt notice the issue before afterwards so not entirely sure, can't find a direct way to zero them back, and don't want to fiddle around without asking for some help from you guru's.

Below is the scan + a graph of the two sensors in action, so yo can see: Fully functional, but incorrect offset on one.

s!AhFGTBanJH1gpHOYmpEhtA6tmhRN


Code:
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
VCDS Version: 19.6.2.0 (x64)
Data version: 20190930 DS308.0
www.Ross-Tech.com


VIN: WAUZZZ4F76N051973   License Plate: 
Mileage: 293490km-182366mi   Repair Order: 


Chassis Type: 4F (4F0)
Scan: 01 02 03 05 07 08 09 0E 13 15 16 17 18 19 34 37 42 46 47 4F
          52 53 55 56 61 62 67 69 6D 72 76 77

VIN: WAUZZZ4F76N051973   Mileage: 293490km-182366miles

00-Steering Angle Sensor -- Status: OK 0000
01-Engine -- Status: OK 0000
02-Auto Trans -- Status: OK 0000
03-ABS Brakes -- Status: Malfunction 0010
05-Acc/Start Auth. -- Status: OK 0000
07-Control Head -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: OK 0000
0E-Media Player 1 -- Status: OK 0000
13-Auto Dist. Reg -- Status: Malfunction 0010
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: OK 0000
18-Aux. Heat -- Status: OK 0000
19-CAN Gateway -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
34-Level Control -- Status: OK 0000
37-Navigation -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
47-Sound System -- Status: OK 0000
4F-Centr. Electr. II -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
53-Parking Brake -- Status: OK 0000
55-Headlight Range -- Status: OK 0000
56-Radio -- Status: OK 0000
61-Battery Regul. -- Status: OK 0000
62-Door, Rear Left -- Status: OK 0000
67-Voice Control -- Status: OK 0000
69-Trailer -- Status: OK 0000
6D-Trunk Elect. -- Status: OK 0000
72-Door, Rear Right -- Status: OK 0000
76-Park Assist -- Status: OK 0000
77-Telephone -- Status: OK 0000
 
-------------------------------------------------------------------------------
Address 01: Engine        Labels: 059-907-401-ASB.clb
   Part No SW: 4F0 910 401 N    HW: 4F0 907 401 B
   Component: 3.0L V6TDI  A000AG  0030  
   Revision: --H01---    Serial number:               
   Coding: 0011372
   Shop #: WSC 02335 785 00200
   VCID: 2756F21D96ADB877C6-8072

No fault code found.
Readiness: 0 0 1 1 1 

-------------------------------------------------------------------------------
Address 02: Auto Trans        Labels: 09L-927-760.lbl
   Part No SW: 4F1 910 156 B    HW: 09L 927 156 A
   Component: AG6 09L 3.0lTDI RdW 0030  
   Revision: --H01---    Serial number:        4059014
   Coding: 0000001
   Shop #: WSC 02335 785 00200
   VCID: 234EE60DE29554579A-8076

No fault code found.

-------------------------------------------------------------------------------
Address 03: ABS Brakes        Labels: 4F0-910-517.clb
   Part No SW: 4F0 910 517 C    HW: 4F0 614 517 C
   Component: ESP 8.0 quattro H03 0090  
   Revision: 00000000    Serial number: 00000000000000
   Coding: 0000392
   Shop #: WSC 02335 785 00200
   VCID: 244CE511E79B536FE3-8070

1 Fault Found:
02847 - Brake Pressure Sensor; Front Left 
            009 - Open or Short to Ground
             Freeze Frame:
                    Fault Status: 01101001
                    Fault Priority: 3
                    Fault Frequency: 1
                    Reset counter: 148
                    Mileage: 293496 km
                    Time Indication: 0
                    Date: 2019.10.01
                    Time: 19:10:13

             Freeze Frame:
                    Hex Value: 0x0000
                    Hex Value: 0x0282
                    Hex Value: 0x0048
                    Hex Value: 0x4192
                    Hex Value: 0x00FF


-------------------------------------------------------------------------------
Address 05: Acc/Start Auth.        Labels:. 4F0-910-852.clb
   Part No SW: 4F0 910 852 A    HW: 4F0 905 852 C
   Component: FBSAUDIC6 ELVSG H01 0040  
   Revision: 09010701    Serial number: 10601600821288
   Coding: 0000135
   Shop #: WSC 37516 133 92715
   VCID: 244CE511E79B536FE3-8070

   Subsystem 1 - Part No: 4F0 910 131 G
   Component: FBSAUDIC6 EZS   H44 0070

   Subsystem 2 - Part No: 4F0 910 335 
   Component: FBSAUDIC6 KSG   H26 0080

No fault code found.

-------------------------------------------------------------------------------
Address 07: Control Head        Labels: 4F0-910-7xx-07-H.clb
   Part No SW: 4F1 910 732 D    HW: 4E0 035 729 
   Component: Interfacebox    H43 5570  
   Revision: 00000000    Serial number: 350G.057581996
   Coding: 0001002
   Shop #: WSC 02335 785 00200
   VCID: 254AF815ECA1AA67F4-8070

   Subsystem 1 - Part No: 4F0 910 609 E
   Component: Bedienteil MMIC6H09 0060

   Subsystem 2 - Serial number: 00000001289006

   Subsystem 3 - Serial number: 0130.03.090000000100010634ÿ

   Subsystem 4 - Serial number: 010634ÿ

No fault code found.

-------------------------------------------------------------------------------
Address 08: Auto HVAC        Labels: 4F0-910-043.clb
   Part No SW: 4F0 910 043     HW: 4F1 820 043 S
   Component: KLIMABETAETIGUNGH12 0160  
   Revision: 00000027    Serial number: 00000030036734
   Coding: 0002326
   Shop #: WSC 02335 785 00200
   VCID: 5BBE9EED9A652C9792-800E

No fault code found.

-------------------------------------------------------------------------------
Address 09: Cent. Elect.        Labels: 4F0-910-279.lbl
   Part No SW: 4F0 910 279 A    HW: 4F0 907 279 A
   Component: ILM Fahrer      H15 0080  
   Revision: 00000000    Serial number: 4F0907279     
   Coding: 0013122
   Shop #: WSC 02335 785 00200
   VCID: 2756F21D96ADB877C6-8072

   Subsystem 1 - Part No: 4F1 910 113   Labels: 1KX-955-119.CLB
   Component: Wischer AudiC6  H05 0150  
   Coding: 00062736
   Shop #: WSC 02335  

   Subsystem 2 - Part No: 8K0 910 557   Labels: 8K0-955-559.CLB
   Component: REGENLICHTSENSORH04 0003  
   Coding: 00150317
   Shop #: WSC 02335  

No fault code found.

-------------------------------------------------------------------------------
Address 0E: Media Player 1        Labels: 4E0-910-111.lbl
   Part No SW: 4E0 910 111 F    HW: 4E0 035 111 A
   Component: CD-Changer      H44 0470  
   Revision: 00000000    Serial number: AUZ5ZBE7199393
   Shop #: WSC 00000 000 00000
   VCID: 1C3CDDF1DFEB6BAF5B-8048

No fault code found.

-------------------------------------------------------------------------------
Address 13: Auto Dist. Reg        Labels: 4F0-910-561.lbl
   Part No SW: 4F0 910 561     HW: 4F0 907 561 
   Component: ABSTANDSREGELUNGH15 0250  
   Revision: --------    Serial number: 00000000000000
   Coding: 0031161
   Shop #: WSC 02335 785 00200
   VCID: 60C4A901B3030F4FC7-8034

1 Fault Found:
01316 - ABS Control Module 
            013 - Check DTC Memory
             Freeze Frame:
                    Fault Status: 01101101
                    Fault Priority: 0
                    Fault Frequency: 2
                    Reset counter: 188
                    Mileage: 293496 km
                    Time Indication: 0
                    Date: 2019.10.01
                    Time: 19:10:16

             Freeze Frame:
                    Temperature: 24.0°C
                    Voltage: 11.78 V
                    Bin. Bits:    01000
                    Hex Value: 0x2513
                    Hex Value: 0x0007
                    Speed: 0.0 km/h
                    Lateral Accel.: 0.00 m/s^2


-------------------------------------------------------------------------------
Address 15: Airbags        Labels: 4F0-910-655-8R.clb
   Part No SW: 4F0 910 655 E    HW: 4F0 959 655 B
   Component: 43 AIRBAG AUDI8RH29 0260  
   Revision: 07H29000    Serial number: 0037LD08YK3N  
   Coding: 0013363
   Shop #: WSC 02325 785 00200
   VCID: 2952F42580B98E07D0-807C

   Subsystem 1 - Serial number: 6332CSME0B091144Y

   Subsystem 2 - Serial number: 6342CSME0A6A6953B

   Subsystem 3 - Serial number: 6352QSME0442233D8

   Subsystem 4 - Serial number: 6362QSME02374259A

   Subsystem 5 - Serial number: 63734SME0342107BT

   Subsystem 6 - Serial number: 63834SME0344793F4

No fault code found.

-------------------------------------------------------------------------------
Address 16: Steering wheel        Labels: 4F0-910-549.lbl
   Part No SW: 4F0 910 549     HW: 4F0 953 549 A
   Component: Lenksäulenmodul H07 0230  
   Revision: 00H07000    Serial number: 90026051830150
   Coding: 0012052
   Shop #: WSC 02335 785 00200
   VCID: 66C8BF195127617F3D-8032

   Subsystem 1 - Part No: XXXXXXXXXXX 
   Component: Lenkradmodul    H07 0080

No fault code found.

-------------------------------------------------------------------------------
Address 17: Instruments        Labels: 4F0-910-xxx-17.lbl
   Part No SW: 4F0 910 930 A    HW: 4F0 920 931 D
   Component: KOMBIINSTR. M73 H16 0630  
   Revision: 00000000    Serial number: 4R035WC75     
   Coding: 1249103
   Shop #: WSC 00540 218 97652
   VCID: 2142EC05F889464788-8074

No fault code found.

-------------------------------------------------------------------------------
Address 18: Aux. Heat        Labels: None
   Part No SW: 4F0 910 105 A    HW: 4F0 265 081 H
   Component: Heizgeraet      H08 0050  
   Revision:        A    Serial number: 09011480      
   Coding: 0000111
   Shop #: WSC 37516 133 86897
   VCID: 1B3EDEEDDAE56C9752-804E

No fault code found.

-------------------------------------------------------------------------------
Address 19: CAN Gateway        Labels:. 4F0-910-468.clb
   Part No SW: 4F0 910 468 A    HW: 4F0 907 468 E
   Component: Gateway         H10 0060  
   Revision: 10          Serial number: 11009053190159
   Coding: EFFE7BC61B7106
   Shop #: WSC 20346 133 86805
   VCID: 2756F21D96ADB877C6-8072

No fault code found.

-------------------------------------------------------------------------------
Address 34: Level Control        Labels: 4F0-910-553.clb
   Part No SW: 4F0 910 553     HW: 4F0 907 553 
   Component: J197 LUFTFEDER  H15 0040  
   Serial number: 006280013083  
   Coding: 0000220
   Shop #: WSC 02334 785 00200
   VCID: 61C2AC05B8090647C8-8034

No fault code found.

-------------------------------------------------------------------------------
Address 37: Navigation        Labels: 4E0-910-88x-37.lbl
   Part No SW: 4E0 910 888 P    HW: 4E0 919 887 C
   Component: MNS ECE         H45 1060  
   Revision: 00000000    Serial number: 305GK057617223
   Shop #: WSC 02335 785 00200
   VCID: 3B7E3E6D7A250C97B2-806E

No fault code found.

-------------------------------------------------------------------------------
Address 42: Door Elect, Driver        Labels: 4F0-910-793-42.lbl
   Part No SW: 4F0 910 793 B    HW: 4F0 959 793 B
   Component: TSG FA          H11 0040  
   Revision: 00-00000    
   Coding: 0020078
   Shop #: WSC 02335 785 00200
   VCID: 2952F42580B98E07D0-807C

No fault code found.

-------------------------------------------------------------------------------
Address 46: Central Conv.        Labels:. 4F0-910-289.lbl
   Part No SW: 4F0 910 289 B    HW: 4F0 907 289 B
   Component: Komfortgeraet   H18 0130  
   Revision: 01300018    Serial number: 01005489380000
   Coding: 3547889
   Shop #: WSC 02335 785 00200
   VCID: 2952F42580B98E07D0-807C

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

   Subsystem 2 - Part No: 4F0 910 177 
   Component: Innenraumueberw.H01 0020

No fault code found.

-------------------------------------------------------------------------------
Address 47: Sound System        Labels: 4F0-910-223-BO.lbl
   Part No SW: 4F0 910 223 J    HW: 4F0 035 223 G
   Component: DSP-High C6     H09 0240  
   Revision: PROD_01     Serial number: 00000000795417
   Coding: 0000122
   Shop #: WSC 02335 785 00200
   VCID: 254AF815ECA1AA67F4-8070

No fault code found.

-------------------------------------------------------------------------------
Address 4F: Centr. Electr. II        Labels: 4F0-910-280.lbl
   Part No SW: 4F0 910 280     HW: 4F0 907 280 A
   Component: ILM Beifahrer   H10 0080  
   Revision:             Serial number: 00000000112289
   Coding: 0001113
   Shop #: WSC 02335 785 00200
   VCID: 5EB897F9897739BFF5-800A

No fault code found.

-------------------------------------------------------------------------------
Address 52: Door Elect, Pass.        Labels: 4F0-910-793-52.lbl
   Part No SW: 4F0 910 793 B    HW: 4F0 959 792 B
   Component: TSG BF          H11 0040  
   Revision: 00-00000    
   Coding: 0020078
   Shop #: WSC 02335 785 00200
   VCID: 2952F42580B98E07D0-807C

No fault code found.

-------------------------------------------------------------------------------
Address 53: Parking Brake        Labels: 4F0-910-801.clb
   Part No SW: 4F0 910 801     HW: 4F0 907 801 
   Component: EPB  C63C0030   H03 0030  
   Revision: C63C0030    
   Coding: 0000321
   Shop #: WSC 02334 785 00200
   VCID: 5DBA90F5847122A7EC-8008

No fault code found.

-------------------------------------------------------------------------------
Address 55: Headlight Range        Labels: 4F0-910-357.lbl
   Part No SW: 4F0 910 357 C    HW: 4F0 907 357 C
   Component: AFS 1           H01 0030  
   Revision: 00000001    Serial number:               
   Coding: 0000017
   Shop #: WSC 02325 785 00200
   VCID: 2648FF1991A7A17FFD-8072

   Subsystem 1 - Part No: 4F0 941 329 B
   Component: AFS-Modul links H02 0020

   Subsystem 2 - Part No: 4F0 941 329 B
   Component: AFS-Modul rechtsH02 0020

No fault code found.

-------------------------------------------------------------------------------
Address 56: Radio        Labels: 4E0-910-541.lbl
   Part No SW: 4E0 910 541 T    HW: 4F0 035 541 B
   Component: TUNER EU/US/RDW H42 0630  
   Revision: 00000000    Serial number: 394GZ057570952
   Coding: 0000001
   Shop #: WSC 02335 785 00200
   VCID: 31621C45A869F6C718-8064

No fault code found.

-------------------------------------------------------------------------------
Address 61: Battery Regul.        Labels: 4F0-910-181.lbl
   Part No SW: 4F0 910 181 E    HW: 4F0 915 181 A
   Component: ENERGIEMANAGER  H12 0490  
   Revision: 00000000    Serial number: 00000000073226
   Shop #: WSC 00000 384 00290
   VCID: 234EE60DE29554579A-8076

   Subsystem 1 - Part No: 000 415 915 AK
   Component: von TU3  5286138647       
   Coding: 303030343135393135414B54553335323836313338363437
   Shop #: WSC 12345 384 00290

No fault code found.

-------------------------------------------------------------------------------
Address 62: Door, Rear Left        Labels: 4F0-910-795.lbl
   Part No SW: 4F0 910 795     HW: 4F0 959 795 
   Component: TSG HL          H11 0030  
   Coding: 0019502
   Shop #: WSC 02335 785 00200
   VCID: 69D2B42540394E0710-803C

No fault code found.

-------------------------------------------------------------------------------
Address 67: Voice Control        Labels: 4E0-910-75x-67.lbl
   Part No SW: 4E0 910 754 S    HW: 4E0 035 753 A
   Component: SDS 3502 UK     H45 0630  
   Revision: 00000000    Serial number: 00000507040160
   Shop #: WSC 12336 024 394758
   VCID: 36682F594107D1FF4D-8062

No fault code found.

-------------------------------------------------------------------------------
Address 69: Trailer        Labels: 4F0-910-383.lbl
   Part No SW: 4F0 910 383     HW: 4F0 907 383 
   Component: ANHAENGERELEKTR H02 0020  
   Coding: 0000331
   Shop #: WSC 02335 785 00200
   VCID: 62C0A309BD0F1D5FD1-8036

No fault code found.

-------------------------------------------------------------------------------
Address 6D: Trunk Elect.        Labels: Redir Fail!
   Part No SW: 4F9 910 591     HW: 4F9 827 851 B
   Component: ValeoHeckdeckel H14 0280  
   Revision: --H14001    Serial number: E5030000B     
   Shop #: WSC 23250 431 715754
   VCID: 6CDCCD314FCB5B2F6B-8038

   Subsystem 1 - Part No: 4F9 910 592 
   Component: ValeoHeckdeckel H14 0280

   Subsystem 2 - Serial number: E5030100B     

   Subsystem 3 - Serial number: KK12.07.05--H14001001B0034ÿ

   Subsystem 4 - Serial number: 1B0034ÿ

No fault code found.

-------------------------------------------------------------------------------
Address 72: Door, Rear Right        Labels: 4F0-910-795.lbl
   Part No SW: 4F0 910 795     HW: 4F0 959 794 
   Component: TSG HR          H11 0030  
   Coding: 0019502
   Shop #: WSC 02335 785 00200
   VCID: 69D2B42540394E0710-803C

No fault code found.

-------------------------------------------------------------------------------
Address 76: Park Assist        Labels: 4Fx-910-283.lbl
   Part No SW: 4F0 910 283 C    HW: 4F0 919 283 C
   Component: Parkhilfe 8-Kan H12 0020  
   Revision: 00H12000    Serial number: 11820518202728
   Coding: 0211016
   Shop #: WSC 02335 785 00200
   VCID: 244CE511E79B536FE3-8070

No fault code found.

-------------------------------------------------------------------------------
Address 77: Telephone        Labels: 4E0-910-333.lbl
   Part No SW: 4E0 910 333 F    HW: 4E0 862 333 C
   Component: TELEFONMODUL EU     0770  
   Revision: 00000006    Serial number: T2AUDX0505J3PM
   Coding: 0000007
   Shop #: WSC 02335 785 00200
   VCID: 2240E309FD8F5D5F91-8076

No fault code found.

End-------------------------(Elapsed Time: 03:11)--------------------------
 
   #2  

AIB Wolfgang

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Hello
Measurements in "03" channel 11 field 1 and 2 helpfull.
Probably the pressure sensor 4F0 907 597 A for left side is defectiv.
Cable and connection measurement is required
 
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   #3  

pviken

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Don't look like the first image shows properly, but both sensors works perfect, only disaligned by a faulty negative offset.

FWdMDTQ
 
   #4  

AIB Wolfgang

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" but both sensors works perfect"

Hello

No,
Measured value block 011:
Additional brake pressure sender front right
Additional brake pressure sender, front left
Only for vehicles with ACC.
Display in bar min. -41 bar max. about 292 bar,
by electrical errors e.g. Short circuit to earth, a value of approx. -20 bar is displayed; in the event of a short circuit to positive 5V (supply voltage), a value of approx. 200 is displayed.
 
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   #5  

pviken

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Yeah, sounds like that... but, actually they are ok. I have tried to upload the picture here, but don't get it to display.
Try copy/paste: https://onedrive.live.com/redir?resid=607D24A7164C4611!4723&authkey=!AJiakSG0Dq2aFE0

You will see that both sensors track each other perfectly when pressure is buildt by pushing the pedal, but one starts off at a negative 22-ish bar. That is obviously wrong, but is normally due to incorrect calibration of the offset value.
Pressure sensors is normally calibrated by a offset value in the software to make sure it begins at zero against atmosphere (or no applied pressure in this case), but I can't see that option available in VagCom.
Could be that it's included in the procedure applied when bleeding or testing, but have not tried those options yet.

These sensors sit on the brake lines, not too far from the caliper, and there should be a way to zero the calibration after replacement etc.

https://onedrive.live.com/redir?resid=607D24A7164C4611!4723&authkey=!AJiakSG0Dq2aFE0
 
   #6  

pviken

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FWdMDTQ.jpg
 
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