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Thread: Secondary Air readiness

  1. #71
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    Intake air temp issues will cause SAI not to test. If the car sees the temp too high, it will prevent the SAI test from running. What numbers are you seeing in Measuring block group 4 block 4?

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  3. #72
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    If the only tech support to be found here comes from this jack thing, please expedite my RMA so I can be done with this waste of time.

  4. #73
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    Quote Originally Posted by Santos View Post
    Intake air temp issues will cause SAI not to test. If the car sees the temp too high, it will prevent the SAI test from running. What numbers are you seeing in Measuring block group 4 block 4?
    Right now today?

    Around 80 F

  5. #74
    Benevolent Dictator Uwe's Avatar
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    Quote Originally Posted by sfojimbo View Post
    Right now today?

    Around 80 F
    No, you're certainly not seeing 80 F in VCDS.

    -Uwe-
    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.

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  7. #75
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    You realize that those scans were done weeks ago don't you?

    That's why I've been reluctant to bother posting them.

  8. #76
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    Quote Originally Posted by sfojimbo View Post
    You realize that those scans were done weeks ago don't you?

    That's why I've been reluctant to bother posting them.
    Those scans have more useful information than the newer scans you posted. Did you correct the issues to the MAF or Intake air temp? Both of those components can cause the SAI not to test, even if they are not triggering codes in the newer scans.

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  10. #77
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    Quote Originally Posted by sfojimbo View Post
    Right now today?

    Around 80 F
    Your ECU doesn't know or care what the weatherman says. It cares what your intake air temperature sensor says, in MVB group 4 block 4. Can you check please, with the car running at idle?
    Silence gives consent.

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  12. #78
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    I've never been aware of any MAF problem.

    As far as the temps are concerned,when I tested in early afternoon my engine area was exposed to an intense afternoon sun so the intake temps were sometimes very high and caused me to stop testing.

    I don't thing there were any temp problems in yesterday's scans.

    I have a spare MAF sensor and I could swap this one out easy enough, but it reads about 3.5 gpm when idling and I suspect that's about right.

  13. #79
    Ross-Tech Employee Dana's Avatar
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    The oldest scan

    8-10-17 347 pm
    Code:
    Thursday,10,August,2017,15:46:59:34562
    
    VIN: 3VWVH69M23M147751   Mileage: 273440km-169907miles
    -------------------------------------------------------------------------------
    Address 01: Engine        Labels: 022-906-032-BDF.lbl
       Part No: 022 906 032 CS
       Component: MOTRONIC ME7.1.1G   0006  
       Coding: 00032
       Shop #: WSC 26078  
       VCID: 5EE696F8A92FE5D7096-5184
       3VWVH69M23M147751     VWZ7Z0C6853944
    
    3 Faults Found:
    16497 - Intake Air Temp. Sensor (G42) 
                P0113 - 35-10 - Signal too High - Intermittent
    16486 - Mass Air Flow Sensor (G70) 
                P0102 - 35-10 - Signal too Low - Intermittent
    16795 - Secondary Air Injection System 
                P0411 - 35-00 - Incorrect Flow Detected
    Readiness: 0000 1000
    showed that bit not set (Readiness: 0000 1000) with an actual DTC that may explain SAI readiness problems:

    16795 - Secondary Air Injection System
    P0411 - 35-00 - Incorrect Flow Detected

    Although we should still look at that MAF I would make sure the combi valve holds vacuum. If it isn't a PITA to remove you may even want to see if the valve moves freely and opens fully in addition to looking for plugged ports in the head. That doesn't happen often but at high mileage it wouldn't be unheard of.

    Key on, engine Output tests won't help with readiness but the testing the fuse, relay and pump should be possible via [Output Tests]. I realize you had good flow when checking it on a cold start but it is far easier to hear everything when the engine isn't running.

  14. #80
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    Quote Originally Posted by sfojimbo View Post
    You realize that those scans were done weeks ago don't you?

    That's why I've been reluctant to bother posting them.
    They indicate at some point there were problems with the MAF and IAT sensors, both of which are integral to running the SAI test. Intake temp has to be in a certain range, MAF has to be in a certain range, and the ECU wants to see a change in air-fuel ratio to verify SAI airflow to pass the test, which is done by cross-comparison of MAF and O2 sensors during the test.

    I think you have a perception that the SAI test isn't passing because you haven't found the right hammer to hit your SAI pump with yet. That's not the case. From earlier in this thread you already said the SAI pump runs when given voltage. So it works. But you've seen fault codes for two of the sensors the ECU needs to test and validate SAI performance. That's important.

    MAF sensor is of particular interest because they're a common failure item, and worse, there are a flood of cheap clone replacement parts that don't perform right and cause hard-to-find problems that don't necessarily throw up DTCs right away.
    Last edited by jyoung8607; 09-06-2017 at 04:34 PM.
    Silence gives consent.

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