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Thread: HEX-NET will to read engine addresses

  1. #1
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    HEX-NET will to read engine addresses

    I have a 2008 2.0T A4 Quattro which showed a check engine light two days ago. The A4 seems to be running well, but I cannot gain access to the OBD-II fault codes, and when I run a diagnostic none of the engine addresses are read. All other addresses are read normally and there is no data that indicates what might be wrong.

    Any Ideas??? Best Binsu

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    Benevolent Dictator Uwe's Avatar
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    You're presumably doing this with VCDS-Mobile?

    What happens if you just do [Select] -> [01-Engine]?

    Shaun had a 2008 A4 2.0T for several years while working on the HEX-NET and VCDS-Mobile. So I'm pretty confident it should work.

    -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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    Verified VCDS User Zenerdiode's Avatar
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    My A4q is a 2.0TFSi too, however it is the CDNC engine and I believe on your side of the pond, you have the CAEB. My HN works flawlessly wired with a USB cable, Access Point with VCDS, and stand-alone with VCDS-Mobile.

    I’m pretty sure I’ve seen VCDS logs with the CAEB, but not sure of CAEB with VCDS-Mobile.

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    Quote Originally Posted by Uwe View Post
    You're presumably doing this with VCDS-Mobile?

    What happens if you just do [Select] -> [01-Engine]?

    Shaun had a 2008 A4 2.0T for several years while working on the HEX-NET and VCDS-Mobile. So I'm pretty confident it should work.

    -Uwe-
    Yes, I'm using VCDS mobile, and I will try to select. But, I still cannot access the OBD-II data to find out what codes are being thrown.

    Best, V

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    Quote Originally Posted by Zenerdiode View Post
    My A4q is a 2.0TFSi too, however it is the CDNC engine and I believe on your side of the pond, you have the CAEB. My HN works flawlessly wired with a USB cable, Access Point with VCDS, and stand-alone with VCDS-Mobile.

    I’m pretty sure I’ve seen VCDS logs with the CAEB, but not sure of CAEB with VCDS-Mobile.
    I have been unable to even access the OBD-II fault codes, and all of the other addresses output results. One anomaly I noticed is that some engine data appeared for a split second when I first started the diagnostic, but immediately disappeared. Thanks, Binsu

  7. #6
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    If you go to [Select] -> [Engine] -> [Functions] -> [Fault codes] do you see anything?

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    Quote Originally Posted by Uwe View Post
    You're presumably doing this with VCDS-Mobile?

    What happens if you just do [Select] -> [01-Engine]?

    Shaun had a 2008 A4 2.0T for several years while working on the HEX-NET and VCDS-Mobile. So I'm pretty confident it should work.

    -Uwe-
    Dear Uwe, I tried that and the HEX-NET makes three attempts to initiate the K-line and will not load any address from 01 through 07. OBD-II data is unavailable. However, the Check Engine Light [CEL] has gone off.

    My son drives the car, so I have no first hand knowledge of the conditions under which the CEL will light, and there were no apparent symptoms that I could hear, see or feel. There could have been a possibility that either the oil filler cap or the gas cap may have been loose. He got fuel yesterday and the light is off now.

    However, it is disconcerting that I am unable to diagnose this particular A4. I do know that Audi can read the engine codes and addresses 01 through 07.

    This is frustrating and puzzling. Any assistance would be appreciated.

    Best, Binsu

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    Quote Originally Posted by Shaun View Post
    If you go to [Select] -> [Engine] -> [Functions] -> [Fault codes] do you see anything?

    Shaun, thanks for your advise; please see my reply to Uwe. Best, Binsu

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    It sounds like you might have problems with one of the klines. Does this car have an aftermarket radio? Plugged into car, what does [Options] -> [Self Test] show for K1 and K2 status? Can you post a whole autoscan so we can see what is and is not talking?

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    Benevolent Dictator Uwe's Avatar
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    Quote Originally Posted by Shaun View Post
    It sounds like you might have problems with one of the klines.
    Except on a 2008 US model A4 , the ECU will be on CAN, as is 02-Auto Trans (if it has one), and 03-ABS. Furthermore, the powertrain CAN is brought directly to pins 6 and 14 on the DLC, and there is no Gateway. I wonder if he's got a problem with the wiring to those pins.

    -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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