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Thread: 2011 Passat 2.0 TDI CFFB Engine - can you use VCDS to lock shut EGR valve

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  1. Question 2011 Passat 2.0 TDI CFFB Engine - can you use VCDS to lock shut EGR valve 
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    Good Morning!

    As the EGR gas flow is a function of the ECU activity, can you force
    the system to keep the EGR valve closed, this with a view to diagnosing
    a defect in the EGR control system? I am loathed to start blanking off
    pipes to do this as I suspect the lumpyness an 1500-2000 is the valve (95k miles).

    If you can do this, what am I switching out/over/off/on (newbie but VCDS full licence)

    Cheers

    Dr B

    EGR Capture.jpg

    from: http://www.volkspage.net/technik/ssp/ssp/SSP_316.pdf
     
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  2. Re: 2011 Passat 2.0 TDI CFFB Engine - can you use VCDS to lock shut EGR valve 
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    There are a number of EGR testing functions in VCDS but these can say one is OK when it isn’t.
    "I disapprove of what you say, but I will defend to the death your right to say it"

    Evelyn Beatrice Hall (1868-1956)
     
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  3. Question VCDS EGR test 2.0 TDI CR.....WAS: 2011 Passat 2.0 TDI CFFB Engine - can you use VCDS to lock shut EGR valve 
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    Hi Everyone!

    I ran the VCDS EGR test however I am not sure I recorded the right data during the test, do we have any clues as to what to measure and how a working EGR system would shape up? The test runs ok and prompts for brakes and foot on the accellerator, plug lamp flashes and rpm is governed. The key elements would be the two readings to compare, here I have used-

    EGR specified value ( %)
    EGR solenoid valve: actual value ( %)

    However this was not based on any real reasoning- this is what came out (note the scale on the right)

    egr test EXCEL.jpg

    For the record I recorded

    EGR solenoid valve: actual value
    EGR specified value
    EGR Vacuum Regulator Solenoid Valve: activation
    Engine speed
    Engine torque
    Exhaust gas recirculation (EGR) cooler pump: specified value

    The CSV datafile is here:
    egr LOG-01-IDE00405_&5.CSV - Google Drive

    It has the timestamps for each reading of each variable, I resorted the data in Excel thus:
    egr LOG-01-IDE00021_&5.xlsx - Google Drive

    May repeat with TURBO to get more granularity

    NEXT? Looking to use VCDS to lock out the EGR valve to see if the judder is gone.... youtube helped here:
    VW A4: ALH TDi EGR Adaptation (to minimum operation value) - YouTube

    However locking it out long term is NOT an option as the EGR is used in the DPF regeneration
    cycle - so it won't so the DPF will block up [what I didn't think to do was to see if the DPF state
    could be monitored to MANUALLY regenerate it? Not sure that the warning light for the DPF
    would signal TOO LATE to regenerate..... another issue this ]

    Any thoughts most appreciated

    Dr B
    Attached Images
     
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  4. Re: VCDS EGR test 2.0 TDI CR.....WAS: 2011 Passat 2.0 TDI CFFB Engine - can you use VCDS to lock shut EGR valve 
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    There is a very simple answer to all this, 03L 131 512 DQ.
    "I disapprove of what you say, but I will defend to the death your right to say it"

    Evelyn Beatrice Hall (1868-1956)
     
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  5. Re: VCDS EGR test 2.0 TDI CR.....WAS: 2011 Passat 2.0 TDI CFFB Engine - can you use VCDS to lock shut EGR valve 
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    Simplest may not be the least expensive.....

    Will report back....
     
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