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  1. INPA help ! 
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    Morning.

    I got myself an OBD2 to USB connector, and got INPA all setup.

    Plugged it upto my mates 1999 E46 328i, and i've gone to read off the fault codes as he had ABS and ASC lights on.

    I accidentally cleared the faults before I read them, so the fault list is clear now (and the lights are off), but there's something called "Shadow Memory" (or similar), and when I clear them, 3 come back straight away, and after starting the engine, a 4th comes back.

    What is this Shadow thingy ?

    Thanks,
    Ferret !
     
     

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    Shadow memory is like a backup. If your faults are coming back after clearing them, then fix the faults.
     
     

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    Ferret (06-02-2011)

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    So how come the faults aren't showing on the main fault screen, and only showing in the 'backup' ?

    And the faults will be fixed, but it's not my car, i'm only reading the codes off for the chap, and learning how to use INPA in the process
     
     

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    So what you are saying is that

    1) fault error memory is cleared and checked clear
    2) Shadow memory contains some faults
    3) engine is started
    4) ASC and ABS lights remain lit or relight
    5) fault error memory remains clear
    6) Shadow memory contains some faults

    Is that correct? I'm trying to understand.
     
     

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    Ferret (06-02-2011)

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    I set up INPA recently and I know what you mean, It's not very user friendly is it!!!
    Still it works!
    Dad got me a lead that a bmw technician on his forum made, so you can reprogramme the ecu too. But I'm definately not doing that until I've put in a fair few hours on inpa.
    I suspect your the same, after years of using generic readers and software the interface on inpa looks naff but one wrong move and..........well, I wouldn't want to think about it!!
     
     

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    Ferret (06-02-2011)

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    1) fault error memory is cleared and checked clear Correct - I accidentally cleared the fault codes before I got chance to actually read them (I pressed F2 with my big fat fingers).
    2) Shadow memory contains some faults Correct
    3) engine is started Yes - 3 faults in Shadow, then 1 more comes up after engine is started
    4) ASC and ABS lights remain lit or relight Incorrect - The ABS and ASC lights are no longer lit - But an ASC fault code still comes up in shadow memory. Can't remember off the top of my head, what it is.
    5) fault error memory remains clear Correct
    6) Shadow memory contains some faults Correct - 4 after the engine is started
     
     

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    Quote Originally Posted by btccfan View Post
    I suspect your the same, after years of using generic readers and software the interface on inpa looks naff but one wrong move and..........well, I wouldn't want to think about it!!
    Believe it or not, i've only ever used 1 code reader, on 1 car - Thats it !

    So INPA is new to me, but so is the whole code reading process - Going well so far, just trying to understand how INPA works
     
     

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    btccfan (06-02-2011)

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    Quote Originally Posted by Ferret View Post
    1) fault error memory is cleared and checked clear Correct - I accidentally cleared the fault codes before I got chance to actually read them (I pressed F2 with my big fat fingers).
    2) Shadow memory contains some faults Correct
    3) engine is started Yes - 3 faults in Shadow, then 1 more comes up after engine is started
    4) ASC and ABS lights remain lit or relight Incorrect - The ABS and ASC lights are no longer lit - But an ASC fault code still comes up in shadow memory. Can't remember off the top of my head, what it is.
    5) fault error memory remains clear Correct
    6) Shadow memory contains some faults Correct - 4 after the engine is started
    OK so shadow memory should be ignored. It's just a backup, and may even be stored on the PC).

    I got the impression the faults were coming back in the main memory. In software a shadow copy is used as a backup/redundant copy for integrity. Since INPA is a development tool, access to the error memory history is there.

    Unless the shadow memory is being copied back into the main error memory (including all parameters such as mileage) then you do not have a problem.

    You could consider clearing hte shadow memory, if that is possible.It holds out of date information. However, INPA is so very powerful, I always recommend a "get in, clear the faults and leave, play in the sandbox elsewhere" approach. I have read stories of people fiddling and playing and finding out the car won't start afterwards and it needs a new ECU.
     
     

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    Quote Originally Posted by joylove View Post
    I got the impression the faults were coming back in the main memory.
    Thanks for that mate
    And no, the faults aren't coming back in the main memory. The main memory is clear, and is always clear, even after driving the car for 15miles - The ABS and ASC lights are now off, and the car runs as it such.

    So i'll now consider the Shadow memory as the old memory.... But, it's abit odd how when I clear the memory, I get 3 faults in shadow, then 1 more returns after engine started.
     
     

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