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Thread: 2000 DSC error

  1. #1
    Join Date
    Jun 2015
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    1987 M6

    2000 DSC error

    000 Z3 2.3 Treves MK20 DSC II (cover of module says ATE controller DSC3-ES) reads in INPA under E36; Chassis ; ASCMK20/DSC E46

    Living with the ABS and DSC lights on for a period of time and running INPA and finding no faults but yet could see all the inputs I decided to spring for a
    used DSC module, The ABS light went off and all seemed good until the DSC light came back on but not the ABS light, progress! The fault was the lateral sensor which at first I mistook for the yaw sensor. disconnecting the yaw sensor and reading the faults got me back on track. The Lateral sensor replaced went for a test drive and the DSC light came back on again This time it was #177 preload pump electrical failure. I could not active the pump motor with INPA. Looking at the wiring diagram I say that fuse 51 (30 amp) in the aux fuse seemed to be tied to the pump when I checked it was blown. I replaced the fuse able to activate the pump with INPA, test drive the DSC light came on again note all these times the DSC light comes on when driving slightly over 20mph. The fault this time is #178 preload pump actuation error.

    I am trying to find out what error # 178 Preload Pump Actuation Error means ? what set this fault?

    I have not found very much information on Treves MK20 faults.

    I would also like to find information on coding the DSC I have done it with NCS Expert but want to confirm I have done it correctly.

    The ABS works and under 20 mph the DSC also works.





    Here you can see photos of the failed module note blown capacitor and brunt racings on circuit board as compared to replacement module..
    https://photos.app.*******/7btJcdeRYFoYtoDm6

  2. #2
    Join Date
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    Good work on the diagnosis so far. You are correct there is virtually no info on the Mk20. I'll see what I can dig up. In the mean time, any idea what popped the pump fuse?


    /.randy

  3. #3
    Join Date
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    1987 M6
    Quote Originally Posted by rf900rkw View Post
    Good work on the diagnosis so far. You are correct there is virtually no info on the Mk20. I'll see what I can dig up. In the mean time, any idea what popped the pump fuse?

    What Popped the fuse is a good question...Looking at the fuse at first it did not seem like it was blown https://photos.app.*******/zuPhXBifMUNp6E6EA The fuse did not appeared to have blown by a sudden overload such as a dead short to ground but slow deterioration of the material,l unfortunately the linked photo shows the fuse after the center material fell out when handling it. I am thinking it was a high drawn from the DSC module over a period of time see the photos of the failed module circuit board and capacitors.
    Last edited by Caribe Turf; 03-20-2020 at 06:37 AM. Reason: additional information

  4. #4
    Join Date
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    My Cars
    1987 M6

  5. #5
    Join Date
    Jun 2015
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    I am thinking that Preload Pump Actuation error can only be tripped by by pressure sensors, I am going to try bleeding the brake system. I had bled the system before when the DSC/ABS was off line and was not able to activate the pump.

  6. #6
    Join Date
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    Turned out the pre-pump was bad replaced it and everything works! The replacement was kind of pain. Found some information on pre-pump here http://www.meeknet.co.uk/e38/ABS/Index.htm
    Last edited by Caribe Turf; 04-05-2020 at 04:31 PM. Reason: additional info

  7. #7
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    By the way what I found was the pump was seized

  8. #8
    Join Date
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    Z3, M2, M5, X5, 428i
    Thank you for all the info. This will be useful to someone no doubt.
    2000 Z3 2.3 -Topaz Blue over Sand Beige/Black, Sport
    2003 M5 - Imola Red over Imola Red/Black, Sport
    2004 X5 4.8is - Estoril Blue/Black
    2018 428xi -Estoril Blue II/Black
    2018 M2 - Long Beach Blue/Black

  9. #9
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    Quote Originally Posted by amancuso View Post
    Thank you for all the info. This will be useful to someone no doubt.
    I setup a page with some information that might be helpful


    http://caribeturf.com/2000_bmw_z3_23_absdsc

  10. #10
    Join Date
    Nov 2006
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    New England, USA
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    2000 2.3 Z3, 2007 328xi
    Hello P.R. a great place for a Z3, glad you got it sorted! Thank you for this contribution, and great diagnostic work.

    “Great wisdom is generous; petty wisdom is contentious.” 无为

  11. #11
    Join Date
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    Quote Originally Posted by ZGator View Post
    Hello P.R. a great place for a Z3, glad you got it sorted! Thank you for this contribution, and great diagnostic work.
    The Z3 made one of its first appearances in PR during the filming of Goldeneye.....https://youtu.be/v0R_otq6fI4

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