Tragically
 

Hi guys hope you are all keeping well, as above, went to VW dealer for some parts and after starting up the 3 lights were on and have been for 2 days now. Maybe it was pissed off that I was at VW.
Anyway drives perfect, no gear changing problems, put the Foxwell on it and got DSC57 High pressure switching valve Rear Axle: Connected INPA got fault 87 Precharge valve rear axle Left. Looked at live data and all wheel sensors are good. Fault doesn’t clear with either reader. Does this suggest that the DSC Module needs repair/replaced. Cheers in advance


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I don’t know where the TRAGICALLY came from should be TRAFICA


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Most likely the DSC module might need rebuilding.

Also, it's good you checked your wheel speeds reporting on all 4 wheels. You also need to check you SAS to ensure logical values are being reported.

There are also some other routines you can check the functionality of the DSC. You can check the pump by running one of the routines. Sometimes that motor seizes up and you have to get a whole new DSC hydraulic block since it's not really "serviceable" to rebuild.

Cheers for the reply, checked the SAS this morning and it seems ok. Not sure how other than moving the steering wheel and seeing the readings vary and come back to 0 in the straight ahead position. DSC, don’t know how to activate so some reading me thinks.


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Yes, correct! I usually jack up the front axle and turn the steering wheel left to right [when checking SAS functionality]. (you dont need the engine on to do this since the front axle is unladen)

In terms of the DSC, look at all of your wheel speed and manually spin the wheels to see if they report logical data. Obviously if you turn one wheel, the corresponding wheel will turn at the same rate (granted you are in park and wheels are suspended).

Check the yaw sensor

So, update, went out this morning, it’s raining so quite cold and no lights. Went for a drive and after about 3 miles they come back on. Checked OBC temperature at 82c. Pulled into parking area and faults wouldn’t clear. A few hours later at home I was able to clear the codes also checked the pump worked. Yaw gave readings on the way home. So have decided to go with a module repair. My wife who knows absolutely nothing about cars. Said, isn’t that the same thing you had repaired before we moved to our present house. Doh, is that an indication I’ve fixed so much I can’t remember it all. Found the receipt and it’s a lifetime warranty. Bonus. I’ll call them Monday. Hopefully they won’t try to wriggle out.
Thanks for all the input, I’ll update when I have more information.


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Okay so that seems like good news! I'll anticipate your update.

To resurrect this, I sent the module of and they said they couldn’t find any faults but mentioned that they tidied up some soldering, anyway, refitted. All lights still on so called them up and told them I now had a different fault ie return pressure switch ?? Don’t know what or where that is. They suggested returning the module and pump. Took it all off and sent it back to them, two days later they phone and tell me the module is beyond repair but pump is ok?? Two choices, I can have my money back under the warranty £254 or they can source me another module £404 and it will have the lifetime warranty. May take them two weeks. I’ve gone for the second option as I get a warranty module for £150. Odd though how they sent my original one back with no faults and now it’s beyond repair.


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Is unusual, especially after they had it apart far enough to “tidy up some of the soldering”.... That said, it’s probably a losing battle to argue with them, you probably picked the shortest path to driving your X again by opting for their lifetime warranty module.

Would be curious though, is yours identifiable enough that if they happen to fix and send back that you’d know it? I’m sure all’s we’ll but that is still odd - though I’ve sold allot of parts in my life and been yelled at more than once for something coming out of the box defective... actually used to have a saying “just because it’s new, doesn’t mean it’s good”...

Good luck and keep us posted! [emoji16]


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Way to update! Thanks for the info.

So got the module and pump back, module looks brand new, that’s just an opinion as I’m only seeing the black plastic outer. All fitted and coded BUT I now have a brake pressure sensor fault which is keeping the lights on although they have turned from red to amber. The Foxwell shows the pressure sensor is permanently reading 292 bar of pressure. The vehicle drives fine so that pressure is not being applied while driving. The pedal is a little soft but I’m confident I can sort that. The sensor is fitted to a lot of BMW’s and other manufacturers ie Merc Fiat VW SAAB, so will probably get one from a breaker to absolutely confirm. Can anyone confirm if when sensor removed from pump does fluid come out. Don’t want to wast time on soft pedal fix if I’m going to have to repeat after sensor fix. Pissed though that this is the second time this has come back from ECUTESTING and shown a different fault.


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If you opened up the hydraulic lines anywhere, there is a potential the air bubbles got trapped in the ABS module. Usually to fix this, you'd have to cycle the ABS module in order to bleed the module. There is a service routine to fix this via INPA.

If all you got back is the pressure sensor issue, it could be something easy to check. Now I cannot find what model year and powertrain platform you have for your E53. This is important because there is a 38 pin connector style and a 42 pin connector style. At any rate, I'll go off of mine--which is 42 pin.

https://www.newtis.info/tisv2/a/en/e...it/Zlh4yxb.svg


B76 is your pressure sensor. It lives on the back of the module with three wires from it to the DSC. To answer your question, it will need to sense line pressure--meaning it will have direct access to the fluid.


Located here:
https://www.newtis.info/tisv2/obj/CUwXBd9N

Thanks for the reply Rocketyman, I’ll probably do this tomorrow if it ever stops raining. From an interest point of view, if I unplugged the electrical connection an just plugged it into the replacement sensor should I in theory be able to clear the codes to prove it works and is the problem.


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I'm not sure if it'll "clear the code" per se---but you should actually see that value change from the 292 bar. Right?

In theory you should see multiple values: 1. value with the faulty sensor; 2. value with connector unplugged; 3. value with new sensor

I'd be interested to see what you report back with.

Finally got round to changing the sensor. Took the plug of old sensor (left old sensor in pump) and just plugged it into replacement sensor. All lights went out. Checked pressure reading and it’s 0. Fitted replacement, lost a small amount of fluid but bled with IPNA drove 20miles and all is good.
Should mention that when I removed the old sensor I plugged that in and it still read 292bar and the three lights returned.


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Sweet! There you got! I bet the old sensor probably got rusted out or something since brake fluid absorbs water.

At any rate, sounds like you fixed your issue!