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
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
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
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.
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
By the way what I found was the pump was seized
Thank you for all the info. This will be useful to someone no doubt.
2001 Z3 3.0i -Oxford Green/Sandbeige
2016 428xi -Estoril Blue II/Black
2018 430iC- Estoril Blue II/Black
2018 330it - Melbourne Red/Venetian Beige/Black
I setup a page with some information that might be helpful
http://caribeturf.com/2000_bmw_z3_23_absdsc
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
The Z3 made one of its first appearances in PR during the filming of Goldeneye.....https://youtu.be/v0R_otq6fI4
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