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Thread: Skoda Fabia 5J 2008 communication issues

  1. #1
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    Skoda Fabia 5J 2008 communication issues

    Hi,

    This is gonna be a long post...

    My GF has a Fabia 5J (mk2 non-canbus) which has had an issue for ages where the SRI could not be resetted. Not by VCDS, not by 3rd party dealer and not by Skoda dealer.
    I down-prioritized it as non-fatal error but now the time caught up with me while I was forced to fix a fan problem which was non-fatal until it became fatal. (Climatronic fan regulator faulty resulting in full speed fan only. Full instrument panel removal to replace. Non-fatal error. After a few years on full speed the fan finally died. Unfortunately fatal error.)

    In the meanwhile my GF has complained the car wouldn't start sometimes when getting home from work, waiting a while it finally started. This has only appeared seldomly last few months.

    Summary; three major issues:
    - Faulty climatronic; this has been completely sorted now.
    - Seldomly won't start but recovers in a while
    - SRI cannot be reset

    So while fiddling with the climatronic issues I did a few VCDS run's, doing the Auto-Scan.
    I will attach the full results on the bottom of the post to ease reading.

    First run where climatronic panel, radio and airbags was removed. Respone from the following modules:
    Address 01: Engine (03C 906 024 B)
    Address 03: ABS Brakes (6R0 907 379 E)
    Address 09: Cent. Elect. (6Q1 937 049 F)
    Address 15: Airbags (1C0 909 605 F)
    Address 46: Central Conv. (5J0 959 433 A)

    The instrument cluster was still in there but didn't respond.

    Any run nowadays with all parts assembled only gets response from the following modules:
    Address 01: Engine (03C 906 024 B)
    Address 46: Central Conv. (5J0 959 433 A)

    I'm pretty sure I should get response from these modules as well in a fully functional car:
    Address 08: Auto HVAC
    Address 17: Instruments
    Address 56: Radio (std radio, no aftermarket)
    And possibly but I'm not sure on this one:
    Address 76: Park Assist

    I've sent debug logs to Ross-tech who kindly answered there are no response at all from any of the non-responding modules.
    I just recently specifically tried to connect to the ABS modules several times, no reponse at all.
    Are there anyone here who has any idea why this is the case?
    The car does not have can-bus but obviously there is some communication bus where all modules are addressed specifically. Could there be an issue with this bus? The step is huge to connect an oscilloscope and troubleshoot low-level but it's kinda the next step if noone has any amazing ideas. The knowledge step to get to decode all information and understand it won't be small and will be time-consuming.

    On the non-starting issue I ran into it once myself. While running on the starter I had my eyes on the tachometer and it was dead until it jumped up to 1000 revs when the car finally started. My idea here is the crank sensor or crank sensor signal. But nothing confirmed. No error codes in engine module which I kinda would expect if the signal from the crank sensor is playing up. Besides it never fails when the car is running which should be possible as well with random crank sensor errors.
    Perhaps this can be related to the communication issues as well, I don't know. I think in the simplest of cases the engine should run with the engine module working properly and proper signals from immobilizer. Any idea on this one?

    Full auto-scan with car partially in bits:

    Code:
    Thursday,02,August,2018,18:29:31:45579
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
    VCDS Version: 18.2.1.5 (x64)
    Data version: 20180518 DS287.2
    www.Ross-Tech.com
    
    
    VIN: TMBJC65J783143568   License Plate: 
    
    
    Chassis Type: 5J (5J - Skoda Fabia (2007 > 2010))
    Scan: 01 02 03 08 09 15 16 17 19 25 37 44 46 55 56 76 77
     
    VIN: TMBJC65J783143568   
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: 03C-906-024-BXW.lbl
       Part No SW: 03C 906 024 B    HW: 03C 906 024 F
       Component:  MARELLI 4HV      G 0896  
       Revision: --H05---    Serial number: SKZ7Z0H4703299
       Coding: 0000071
       Shop #: WSC 13765 790 00000
       VCID: 1D099A48C703C5AC2F-FFFE
    
    2 Faults Found:
    18011 - Internal Control Module 
                P1603 - 000 - Failed Self-Test
                 Freeze Frame:
                        Fault Status: 01100000
                        Fault Priority: 1
                        Fault Frequency: 0
                        Reset counter: 0
                        Mileage: 0 km
                        Time Indication: 0
                        Date: 2000.01.01
                        Time: 00:00:00
    
                 Freeze Frame:
                        Bin. Bits: 00000000
                        Load: 0.0 %
                        Lambda: 0.0 %
                        Speed: 0.0 km/h
                        Temperature: -4.0įC
                        Absolute Pres.: 991.8 mbar
                        RPM: 0 /min
    
    28836 - No Communications with HVAC Control Module (J301) 
                U0164 - 000 - 
                 Freeze Frame:
                        Fault Status: 01110000
                        Fault Priority: 1
                        Fault Frequency: 0
                        Reset counter: 0
                        Mileage: 0 km
                        Time Indication: 0
                        Date: 2000.01.01
                        Time: 00:00:00
    
    Readiness: 0000 0000
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes        Labels: 6R0-907-37x-ESP80.clb
       Part No SW: 6R0 907 379 E    HW: 6R0 907 379 E
       Component: ESP 8.0 front   H05 0002  
       Revision: 00000000    Serial number: 00000000000000
       Coding: 0002362
       Shop #: WSC 13765 790 00000
       VCID: 40B7033C1031C84464-FFFE
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect.        Labels:. 6Qx-937-049-C.lbl
       Part No: 6Q1 937 049 F
       Component: 0000 BN-SG.         2S36  
       Coding: 25998
       Shop #: WSC 13765  
       VCID: 3E4B7DC43AC5BEB416-FFFE
    
    4 Faults Found:
    01304 - Radio 
                49-00 - No Communications
    01320 - Control Module for Climatronic (J255) 
                49-00 - No Communications
    01341 - Control Module in Instrument Panel On Comfort CAN (J285) 
                49-10 - No Communications - Intermittent
    01598 - Drive Battery Voltage 
                07-10 - Signal too Low - Intermittent
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 6Q0-909-605-VW5.lbl
       Part No: 1C0 909 605 F
       Component: QA AIRBAG VW61 Q5Q6 0004  
       Coding: 20801
       Shop #: WSC 13765  
       VCID: 2765B8A0C55F1F7C45-FFFE
    
    5 Faults Found:
    00589 - Airbag Igniter 1; Passenger Side (N131) 
                32-10 - Resistance Too High - Intermittent
    01578 - Airbag Deactivation Warning Lamp; Passenger Side (K145) 
                36-00 - Open Circuit
    01228 - Airbag Cut-Off Switch for Passenger Side (E224) 
                36-00 - Open Circuit
    00588 - Airbag Igniter; Driver Side (N95) 
                32-00 - Resistance Too High
    01218 - Side Airbag Igniter; Passenger Side (N200) 
                32-00 - Resistance Too High
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv.        Labels:. 6Q0-959-433.clb
       Part No: 5J0 959 433 A
       Component: 03 KomfortgerŠt     0001  
       Coding: 00019
       Shop #: WSC 13765  
       VCID: 315156F8FB9B51CC9B-FFFE
    
    No fault code found.
    
    End-------------------------(Elapsed Time: 06:20)--------------------------
    Full auto-scan as it is right now with every piece in place:
    Code:
    Saturday,11,August,2018,18:19:20:45579
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
    VCDS Version: 18.2.1.5 (x64)
    Data version: 20180518 DS287.2
    www.Ross-Tech.com
    
    
    VIN: TMBJC65J783143568   License Plate: 
    
    
    Chassis Type: 5J (5J - Skoda Fabia (2007 > 2010))
    Scan: 01 02 03 08 09 15 16 17 19 25 37 44 46 55 56 76 77
     
    VIN: TMBJC65J783143568   
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: 03C-906-024-BXW.lbl
       Part No SW: 03C 906 024 B    HW: 03C 906 024 F
       Component:  MARELLI 4HV      G 0896  
       Revision: --H05---    Serial number: SKZ7Z0H4703299
       Coding: 0000071
       Shop #: WSC 13765 790 00000
       VCID: 1D099A48C703C5AC2F-FFFE
    
    No fault code found.
    Readiness: 0000 0100
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv.        Labels:. 6Q0-959-433.clb
       Part No: 5J0 959 433 A
       Component: 03 KomfortgerŠt     0001  
       Coding: 00019
       Shop #: WSC 13765  
       VCID: 315156F8FB9B51CC9B-FFFE
    
    No fault code found.
    
    End-------------------------(Elapsed Time: 08:22)--------------------------
    Last edited by Uwe; 09-05-2018 at 04:07 PM. Reason: CODE tags

  2. #2
    Benevolent Dictator Uwe's Avatar
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    Remove just the Climatronic module and re-scan. It's possible for one malfunctioning module to interfere with communications with others, and it seems to be the most likely culrpit here.

    -Uwe-
    Last edited by Uwe; 09-05-2018 at 04:18 PM.
    The engineering problems are likely insurmountable. It would be like proposing to land a rocket booster section on a barge floating in the middle of the ocean.

  3. Likes Fredrick Awuor, Andy, SlickNik liked this post
  4. #3
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    Quote Originally Posted by Uwe View Post
    Remove just the Climatronic module and re-scan. It's possible for one malfunctioning module to interfere with communications with others, and it seems to be the most likely culrpit here.

    -Uwe-
    Not the quickest guy around here.. guess I'm tired of fiddling with that car

    Actually did some testing today:
    1. Disconnected Climatronic and Radio, disconnected battery for a few minutes. Still could not communicate with ABS module.
    2. Disconnected ECU, disconnected battery for a few minutes. Still could not communicate with ABS module.
    3. Disconnected ABS, disconnected battery for a few minutes. Still could not communicate with Cent Electr nor Airbags nor Instruments.

    Reconnected everything and gave up for today.

    Sometimes the auto-scan stops in the middle of Central Conv with an error message that communication is lost.
    Sometimes when I manually pick the Central Conv an "01f inv msg type" message pops up before it communicates properly. It may be during canbus connection attempt, not sure. The car has NO canbus.

    Is it worth breaking my back trying to disconnect the Central Conv module and see if anything works better?
    This module along with BCM has been connected at all times, for example during summer when most modules actually communicated.

    Everywhere I have the possible to read the "databus status" from an module or VCDS or wherever, it always says 2-wire if it has any relevant indication.

    The car still runs properly, nothing unusual gets logged. I know the ECU logs a fault if it cannot communicate to HVAC module. And during a month of runtime that has not been logged (at least not permanently, havent read the codes for a month as well) so I guess the ECU can communicate with HVAC but VCDS cannot.
    May this indicate an error between BCM and OBD connector? Wiring? BCM itself?

  5. #4
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    Starting Problem is Software related - get the Engine ECU updated.

  6. #5
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    Quote Originally Posted by vagtuning View Post
    Starting Problem is Software related - get the Engine ECU updated.
    Do you have any more details? Any specific problem you know that has been fixed?

  7. #6
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    Half a year later without any actions whatsoever all warning lights are out and back to normal. Will try connecting the VCDS anytime soon, if it works I'll get seriously confused.
    Some kind of earthing issue perhaps!?

  8. #7
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    After dodging these problems for some time now I had to deal with it. After some troubleshooting and measuring I got myself a used 6Q1 937 049 F central electrics module.

    Full autoscan:
    Code:
    Saturday,27,July,2019,14:51:54:45579
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 10 x64
    VCDS Version: 19.6.1.0 (x64)
    Data version: 20190529 DS308.0
    www.Ross-Tech.com
    
    Workshop Code: 790 13765 000000
    
    VIN: TMBJC65J783143568   License Plate: 
    
    
    Chassis Type: 5J (5J - Skoda Fabia (2007 > 2010))
    Scan: 01 02 03 08 09 15 16 17 19 25 37 44 46 55 56 76 77
     
    VIN: TMBJC65J783143568   Mileage: 149770km-93062miles
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: 03C-906-024-BXW.lbl
       Part No SW: 03C 906 024 B    HW: 03C 906 024 F
       Component:  MARELLI 4HV      G 0896  
       Revision: --H05---    Serial number: SKZ7Z0H4703299
       Coding: 0000071
       Shop #: WSC 13765 790 00000
       VCID: 1D099A48C703C5A792-FFFE
    
    No fault code found.
    Readiness: 0010 0001
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes        Labels: 6R0-907-37x-ESP80.clb
       Part No SW: 6R0 907 379 E    HW: 6R0 907 379 E
       Component: ESP 8.0 front   H05 0002  
       Revision: 00000000    Serial number: 00000000000000
       Coding: 0002362
       Shop #: WSC 13765 790 00000
       VCID: 40B7033C1031C84FD9-FFFE
    
    2 Faults Found:
    18055 - Check Coding of ECUs on Powertrain Data Bus 
                P1647 - 000 - 
    01317 - Control Module in Instrument Cluster (J285) 
                000 - - - Intermittent
    
    -------------------------------------------------------------------------------
    Address 08: Auto HVAC        Labels: 6Q0-907-044.lbl
       Part No: 5J0 907 044 A
       Component: CLIMAtronic SK25    0608  
       Shop #: WSC 00000 000 00000
       VCID: 2867BB9C9841100FF1-FFFE
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 09: Cent. Elect.        Labels:. 6Qx-937-049-C.lbl
       Part No: 6Q1 937 049 F
       Component: 0000 BN-SG.         2S36  
       Coding: 25998
       Shop #: WSC 13765  
       VCID: 3E4B7DC43AC5BEBFAB-FFFE
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 6Q0-909-605-VW5.lbl
       Part No: 1C0 909 605 F
       Component: QA AIRBAG VW61 Q5Q6 0004  
       Coding: 20801
       Shop #: WSC 13765  
       VCID: 2765B8A0C55F1F77F8-FFFE
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 17: Instruments        Labels: 5J0-920-xxx-17.clb
       Part No: 5J0 920 840 B
       Component: KOMBIINSTR.    V2824486  
       Coding: 23113
       Shop #: WSC 13765  
       VCID: 2867BB9CC841100FF1-FFFE
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 19: CAN Gateway        Labels: 6N0-909-901-19.lbl
       Part No: 6N0 909 901 
       Component: 0008 GATEWAY CAN    2S36  
       Coding: 00014
       Shop #: WSC 13765  
       VCID: 70D793FC301118CF69-FFFE
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 25: Immobilizer        Labels: 5J0-920-xxx-25.clb
       Part No: 5J0 920 840 B
       Component: IMMOBILIZER    V2824486  
       Coding: 23113
       Shop #: WSC 13765  
       VCID: 2867BB9CC841100FF1-FFFE
       TMBJC65J783143568     SKZ7Z0H4703299
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 44: Steering Assist        Labels: 6Q0-423-156.clb
       Part No: 6Q0 423 156 AB
       Component: LenkhilfeTRW        V270  
       Coding: 10140
       Shop #: WSC 13765  
       VCID: 6FD590802D2F073770-FFFE
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv.        Labels:. 6Q0-959-433.clb
       Part No: 5J0 959 433 A
       Component: 03 KomfortgerŠt     0001  
       Coding: 00019
       Shop #: WSC 13765  
       VCID: 315156F8FB9B51C726-FFFE
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 56: Radio (J503)       Labels: 5M0-035-1xx-56.clb
       Part No SW: 5J0 035 161 A    HW: 5J0 035 161 A
       Component: Radio         004 Radio         004 00100010  
       Revision: R0004000    Serial number: SKZAZ4H7107268
       Coding: 05000400000600
       Shop #: WSC 13765 790 00000
       VCID: 2077A3BC3071E84FB9-FFFE
    
    No Faults Found
      or DTCs not supported by controller
      or a communication error occurred
    
    -------------------------------------------------------------------------------
    Address 76: Park Assist        Labels: 5J0-919-283.lbl
       Part No: 5J0 919 283 
       Component: Einparkhilfe        V005  
       Revision: 00012000    Serial number: 08011062171532
       Coding: 0001130
       Shop #: WSC 13765 790 00000
       VCID: 6FD590807D2F073770-FFFE
    
    1 Fault Found:
    02070 - Rear Parking Aid Sensors 
                007 - Short to Ground
    
    End-------------------------(Elapsed Time: 05:14)--------------------------
    Things are starting to look pretty good again.
    However the ABS module report some errors. And communication with the Radio is not working properly.
    I've verified the coding for both Central Electrics module as well as CAN Gateway module are properly set according to old auto-scans, also tried re-setting the old value a couple of times.

    I really don't have a clue here but from what I've read up on it seems to be a coding issue?
    I just don't know how to fix the remaining issues.
    Any help please??

    EDIT: Obviously I've cleared the DTCs a couple of times but they keep re-appearing.

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