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Thread: 2005 MK4 Jetta 2.0 BBW creeping lean condition

  1. #1
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    Exclamation 2005 MK4 Jetta 2.0 BBW creeping lean condition

    Hello guys and gals, this is my first of many posts. I've been using a previous employer's VCDS on and off for a little over a year but not for anything too deep. A little back story:

    I purchased a 2005 MK4 Jetta 2.0 BBW with 69,xxx miles last August for $3,000. Car was in excellent shape and it seemed like a pretty sweet deal. The CEL was on and I pulled a p0171 thinking it wouldn't be that big of a deal. The previous owner bought a new OEM MAF to correct the issue but to no avail. I noticed the intake boot wasn't secured properly with the factory clamp so I positioned and checked everything to ensure I would get a sealed condition while I smoked the intake. After finding a small crack in the plastic oil dipstick housing, I ordered a new oem replacement from WorldPAC. After it arrived I cleared the codes and took her for a drive. After 3-25 mile highway trips at 55ish (I live in NYC so this is incredibly hard to accomplish) I was able to complete almost every monitor except EVAP and Secondary Air. As I came back to the shop I noticed my Long Term Fuel Trim had creeped back up around +10. As I attempted to force the monitors I completed EVAP but Secondary Air failed to execute and the CEL came on. I cleared the codes and took her back out for another highway drive and carefully watched the Short Term and Long Term trickle up after I hit 50mph. Air Fuel sensors/ o2s appeared to function normally. Something else I noticed but it could be completely normal as this is my first VAG product, the Secondary Air pump will run from start up but not every ignition, even on a cold start. It also runs when the car is hot during random driving conditions. Is this normal? Could my creeping lean and random SA operation be PCM related?

    Long story short I bought my own VCDS and I'm going to get to the bottom of this. Below is the auto scan:

    Code:
     Sunday,11,June,2017,20:40:13:55960
    VCDS -- Windows Based VAG/VAS Emulator Running on Windows 7 x64
    VCDS Version: 17.1.3.0 (x64)  HEX-NET CB: 0.4341.4
    Data version: 20170320 DS267.7
    www.Ross-Tech.com
    
    
    VIN: 3VWSA69M55M022415   License Plate: 
    
    
    Chassis Type: 9M (9M - VW Jetta IV (1998 > 2014))
    Scan: 01 02 03 08 09 15 16 17 19 22 29 35 36 37 39 46 47 55 56 57
              75 76
     
    VIN: 3VWSA69M55M022415   Mileage: 125630km-78062miles
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: 06A-906-032-BBW.lbl
       Part No: 06A 906 032 RJ
       Component: 2.0l R4/2V      G   6379  
       Coding: 00003
       Shop #: WSC 00066  
       VCID: 77BE337E5717DCF9D8-5184
       3VWSA69M55M022415     VWZ7Z0D0297427
    
    2 Faults Found:
    16555 - Fuel Trim; Bank 1 
                P0171 - 35-10 - System Too Lean - Intermittent
    16485 - Mass Air Flow Sensor (G70) 
                P0101 - 35-00 - Implausible Signal
    Readiness: 0000 1000
    
    -------------------------------------------------------------------------------
    Address 02: Auto Trans        Labels: 01M-927-733.lbl
       Part No: 01M 927 733 MT
       Component: AG4 Getriebe 01M    5078  
       Coding: 00000
       Shop #: WSC 00000  
       VCID: 0E50769A488DFD316B-0964
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 03: ABS Brakes        Labels: 1C0-907-37x-ABS.lbl
       Part No: 1C0 907 379 L
       Component: ABS FRONT MK60      0101  
       Coding: 0004097
       Shop #: WSC 00066 000 00000
       VCID: 3326C76E53EFF0D924-5184
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 15: Airbags        Labels: 6Q0-909-605-VW5.lbl
       Part No: 1C0 909 605 F
       Component: 04 AIRBAG VW61 0202 0003  
       Coding: 12340
       Shop #: WSC 00066  
       VCID: 271E233EC7378C7988-5160
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 17: Instruments        Labels: 1J0-920-xx5-17.lbl
       Part No: 1J5 920 906 K
       Component: KOMBI+WEGFAHRSP VDO V57  
       Coding: 15232
       Shop #: WSC 00000  
       VCID: 3522F9760D9BEEE90A-5160
       3VWSA69M55M022415     VWZ7Z0D0297427
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 19: CAN Gateway        Labels: 6N0-909-901-19.lbl
       Part No: 6N0 909 901 
       Component: Gateway K<->CAN    0001  
       Coding: 00006
       Shop #: WSC 00066  
       VCID: 70AC086232798BC119-5160
    
    No fault code found.
    
    -------------------------------------------------------------------------------
    Address 46: Central Conv.        Labels: 1C0-959-799.lbl
       Part No: 1C0 959 799 C
       Component: 1H Komfortgerát HLO 0004  
       Coding: 00258
       Shop #: WSC 00066  
       VCID: 373EF37E17971CF918-4B1E
    
       Subsystem 1 - Part No: 1C1959801A
       Component: 1H Tőrsteuer.FS KLO 0202  
    
       Subsystem 2 - Part No: 1C1959802A
       Component: 1H Tőrsteuer.BF KLO 0202  
    
       Subsystem 3 - Part No: 1C0959811A
       Component: 1H Tőrsteuer.HL KLO 0202  
    
       Subsystem 4 - Part No: 1C0959812A
       Component: 1H Tőrsteuer.HR KLO 0202  
    
    1 Fault Found:
    01179 - Incorrect Key Programming 
                35-00 -  - 
    
    -------------------------------------------------------------------------------
    Address 56: Radio        Labels: 3B7-035-1xx-56.lbl
       Part No: 3B7 035 180 G
       Component: RADIO 3CP          0007  
       Coding: 00031
       Shop #: WSC 00066  
       VCID: 24043432B6016761AD-5160
    
    1 Fault Found:
    00856 - Radio Antenna 
                36-00 - Open Circuit
    
    End----------(Elapsed Time: 07:35, VBatt start/end: 13.8V/13.7V)-----------
    All monitors were complete except for Secondary Air which had failed at the time of the Auto Scan.

    Any help would be greatly appreciated. I no longer work as an automotive technician for my day job (I work on trains now) but I periodically have access to a lift and various other shop equipment. Thanks for taking the time to read this, and if I can help anyone else out with my experience please don't hesitate to ask!

    -Wes

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  3. #2
    NostraJackAss Jack@European_Parts's Avatar
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    Is the MAF the correct part # and genuine for the BBW?

    Are there any false air leaks?

    What is the status of the ( N80 ) EVAP solenoid mechanically for hold?
    European Parts Emporium/Performance / Immobilizer Solutions EPE
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  5. #3
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    I'm about to take a quick trip to Jersey so I'll hook up my laptop and check the N80 status and post back with data and MAF part #

  6. #4
    NostraJackAss Jack@European_Parts's Avatar
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    The scanner is insufficient for testing the N80 & mechanical crimp tests will be required in tandem.
    European Parts Emporium/Performance / Immobilizer Solutions EPE
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  8. #5
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    Okay so I gather that the N80 is the EVAP purge valve pulling hydrocarbons from the charcoal canister into the intake manifold correct? If my EVAP monitor has ran and passed wouldn't that mean the purge valve was able to command and seal properly?

  9. #6
    NostraJackAss Jack@European_Parts's Avatar
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    Okay so I gather that the N80 is the EVAP purge valve pulling hydrocarbons from the charcoal canister into the intake manifold correct?
    YES





    If my EVAP monitor has ran and passed wouldn't that mean the purge valve was able to command and seal properly?

    NO................
    European Parts Emporium/Performance / Immobilizer Solutions EPE
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    NostraJackAss Jack@European_Parts's Avatar
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    To see for yourself run an EVAP test of N80 with gas cap removed and it will pass wide open every time.

    That is why crimp tests for hold are required because a sticking open N80 will still often pass an 070 test.
    European Parts Emporium/Performance / Immobilizer Solutions EPE
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  13. #8
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    Okay thank you for the info. The part number on the MAF looks like it's applicable for the 2.0BBW. It's a Borsehung B13664.

    How would I got about commanding my N80 with VCDS, is that possible? Should I manually pull a vacuum and actuate it to see that it opens and closes properly?

    What is the crimp test? Blocking off the purge line into the manifold and monitoring the fuel trim?
    Last edited by brooklynt3ch11214; 06-25-2017 at 02:57 PM.

  14. #9
    NostraJackAss Jack@European_Parts's Avatar
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    How would I got about commanding my N80 with VCDS, is that possible? Should I manually pull a vacuum and actuate it to see that it opens and closes properly?
    YES & YES

    How would I got about commanding my N80 with VCDS, is that possible? Should I manually pull a vacuum and actuate it to see that it opens and closes properly? What is the crimp test? Blocking off the purge line into the manifold and monitoring the fuel trim?
    Hook up VCDS and a mighty vac tester to the N80 on one side and then pull a vacuum and it should hold than switch the outputs to initiate in VCDS to watch it release. 0x01-03.

    Now hook up inverse and do it from the other side of N80 & same work procedure.

    Crimps can be done on both sides to measure a deviation when releasing the N80 by the use of VCDS outputs or directly with a trigger to the N80.

    This test verifies the N80 is not the leak itself......
    European Parts Emporium/Performance / Immobilizer Solutions EPE
    Certified Master Trained NY/BAR/BAD 7076062/ASE/SAE/NASTF Legal Factory Authorized/Licensed GeKo/FaZit # 403738
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    Above Magic! No Written record, AUTO-SCAN or Appointment = NO HELP!
    www.FixMyEuro.com <<<<<CLICK HERE! or vwemporium@aol.com ( JPPSG & Unverified members need not PM me & Please don't email or call facility for free tech support...use the forum )
    Getting you CONTROL again of your property - TAKE IT! In Conjunction with.........

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  16. #10
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    Also you have 3 oxygen sensors usually the center one on top of the catalytic converter is the one that controls fuel trim. But make sure you don't have any maf errors which could be caused by a bad cam correlation reading

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