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Thread: Dead transistors on ECU?

  1. #1
    Join Date
    May 2016
    Location
    Riga
    Posts
    83
    My Cars
    e30, e36

    Dead transistors on ECU?

    Hello.
    I use Vems ecu for my project.
    Got home after long test run, everything was fine.
    In the morning car won`t start - no spark.
    I use m52 ignition coils, there is +12v to them.
    I opened Vems case and saw that there are 18 transistors, probably 8 for sequential injectors, 8 for sequential ignition coils and 2 extra, right?



    I took a multimeter un put it on restistance measuring.
    As I can remember 10 out 18 transistors showed me around 11 kohm.
    8 transistors showed me nothing. I tried to measure them inbetween three transistor legs in all possible variations and it didn`t show anything. So, I have 8 dead transistors?

    I had one bad grounding on ECU, could it done damage?
    I hope You can help me with answers, paid a lot for this ecu and have used it for a few months..

  2. #2
    Join Date
    May 2016
    Location
    Riga
    Posts
    83
    My Cars
    e30, e36
    So, looks like transistors are alive, got car started. But, I do not know why it did cut spark off.. Groundings are good actually.

  3. #3
    Join Date
    Jul 2004
    Location
    Houston, TX
    Posts
    12,522
    My Cars
    36 Cylinders
    Crankshaft position sensor?
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  4. #4
    Join Date
    May 2016
    Location
    Riga
    Posts
    83
    My Cars
    e30, e36
    Crankshaft position sensor works. When I tested outputs, no igniton signal in test mode. I am confused..
    Last edited by Pauchuk; 03-27-2017 at 05:13 AM.

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