DSC/ABS issues(air gap error)

[biggeek]

Hello

I have been trying to resolve an issue with my dsc for several months now

symptoms
abs kicking in very early
no traction on inclines
dsc light flashes when acceleration from standstill
brakes locking
skidding

codes states that there is a air gap on the right wheel sensor


actions so far
clear codes(wishful thinking)
cleaned sensor
swapped sensor to see if error follows sensor
brought new sensor
cleaned caliper pins as the breaking got really rough....but this was due to me leaving the clip off. :-[

i did a bit more research and saw an article which said a damage wheel bearing could be the cause....i had a flash back of me beating the hub back in to place when i did my cv boots....okay that must be it!

changed the front wheel bearing and still no joy :'(

any other suggestion???

The only thought I had was the axle nut has not been torqued down to 410nm maybe this is not holding everything in place.

Everytime i tried to fix this issue the car would work fine for 10-15 minutes of driving but then slowly get back to the bad breaking.

Please help I am at my wits end.

oh and the live data streaming shown on my c110 scanner doesn't seem to indicate a problem

[Ricky Bobby]

You need to scan the ABS module with DIS/GT1

Thats the only way to properly diagnose ABS errors

[bcredliner]

Originally Posted by Ricky Bobby

You need to scan the ABS module with DIS/GT1

Thats the only way to properly diagnose ABS errors

[biggeek]

Thanks for the replies.

I scanned with DIS and INPA and got a steering sensor plausibility error.

I reset the sensor via dis but the problem still came back after 10 mins of driving.

Inpa logs

I D E N T I F I C A T I O N R E A D
---------------------------------------

Datum : 26.05.2015 19:53:14
Baureihe : E53

-------------------------------------------------------------
Control unit : Dynamic stability control 4 wheel system
ECU : D_ABSKWP
JobStatus : OKAY
BMW part number : 6768831
Hardware number : 10
Software number : _?_
Supplier : Bosch
Supplier-No : 8
Coding index : 3
Diagnostic index : 32
Bus index : _?_
Date of manufacture Week/Year : _?_/2004
-------------------------------------------------------------
Control unit : Transfer gear box Control unit
ECU : D_VGSG
JobStatus : OKAY
BMW part number : 7540132
Hardware number : 11
Software number : _?_
Supplier : Magna Steyr
Supplier-No : 60
Coding index : 4
Diagnostic index : 2768
Bus index : _?_
Date of manufacture Week/Year : _?_/2004
-------------------------------------------------------------
Control unit : Dynamic stability control
ECU : D_0056
JobStatus : IFH-0009: NO RESPONSE FROM CONTROLUNIT
-------------------------------------------------------------
Control unit : Gear box ecu GS19
ECU : D_EGS
JobStatus : OKAY
BMW part number : 7557063
Hardware number : 71
Software number : _?_
Supplier : Bosch
Supplier-No : 8
Coding index : 0
Diagnostic index : 513
Bus index : _?_
Date of manufacture Week/Year : _?_/2004
-------------------------------------------------------------
Control unit : Motor
ECU : D_0012
JobStatus : OKAY
BMW part number : 7544610
Hardware number : 10
Software number : _?_
Supplier : Bosch
Supplier-No : 8
Coding index : 16
Diagnostic index : 32
Bus index : _?_
Date of manufacture Week/Year : _?_/2004
-------------------------------------------------------------
Control unit : Steering angle sensor
ECU : D_0057
JobStatus : OKAY
BMW part number : 6760232
Hardware number : 4
Software number : 4
Supplier : Kostal
Supplier-No : 2
Coding index : 1
Diagnostic index : 30
Bus index : 60
Date of manufacture Week/Year : 3/4
-------------------------------------------------------------
Control unit : Air suspension
ECU : D_00AC
JobStatus : OKAY
BMW part number : 6758452
Hardware number : 20
Software number : 30
Supplier : WABCO
Supplier-No : 43
Coding index : 23
Diagnostic index : 22
Bus index : 0
Date of manufacture Week/Year : 26/2
-------------------------------------------------------------
Control unit : Tyre pressure control
ECU : D_0070
JobStatus : IFH-0009: NO RESPONSE FROM CONTROLUNIT
-------------------------------------------------------------
Control unit : Light check modul
ECU : D_00D0
JobStatus : OKAY
BMW part number : 6942693
Hardware number : 7
Software number : 70
Supplier : UTA
Supplier-No : 6
Coding index : 22
Diagnostic index : 14
Bus index : 0
Date of manufacture Week/Year : 12/4
-------------------------------------------------------------
Control unit : Active Light Control E46
ECU : D_0066
JobStatus : IFH-0009: NO RESPONSE FROM CONTROLUNIT
-------------------------------------------------------------
Control unit : Headlight vertical aim control
ECU : D_009A
JobStatus : SYS-0012: IDENTIFICATION ERROR
-------------------------------------------------------------
Control unit : Rain- light sensor
ECU : D_00E8
JobStatus : OKAY
BMW part number : 6923954
Hardware number : 40
Software number : 32
Supplier : Kostal
Supplier-No : 2
Coding index : 2
Diagnostic index : 10
Bus index : 0
Date of manufacture Week/Year : 8/4
-------------------------------------------------------------
Control unit : Multidrive Sunroof
ECU : D_0008
JobStatus : OKAY
BMW part number : 6941485
Hardware number : C1
Software number : 47
Supplier : Siemens
Supplier-No : 4
Coding index : 6
Diagnostic index : 10
Bus index : 14
Date of manufacture Week/Year : 23/3
-------------------------------------------------------------
Control unit : Electronic vehicle immobilization III
ECU : D_0044
JobStatus : OKAY
BMW part number : 6941985
Hardware number : 4
Software number : 8
Supplier : UTA
Supplier-No : 6
Coding index : 81
Diagnostic index : 81
Bus index : 7
Date of manufacture Week/Year : 12/4
-------------------------------------------------------------
Control unit : Central information system
ECU : D_00C0
JobStatus : IFH-0009: NO RESPONSE FROM CONTROLUNIT
-------------------------------------------------------------
Control unit : Central body electronics 1 PM Passenger
ECU : D_ZKE3BT
JobStatus : OKAY
BMW part number : 6944556
Hardware number : 5
Software number : 5
Supplier : Alps
Supplier-No : 22
Coding index : 0
Diagnostic index : 80
Bus index : 9
Date of manufacture Week/Year : 8/4
-------------------------------------------------------------
Control unit : Central body electronics 1 PM Driver
ECU : D_ZKE3FT
JobStatus : OKAY
BMW part number : 6944555
Hardware number : 5
Software number : 5
Supplier : Alps
Supplier-No : 22
Coding index : 0
Diagnostic index : 80
Bus index : 9
Date of manufacture Week/Year : 8/4
-------------------------------------------------------------
Control unit : Central body electronics 1 or 3 Basic modul
ECU : D_ZKE_GM
JobStatus : OKAY
BMW part number : 6946947
Hardware number : 25
Software number : 32
Supplier : UTA
Supplier-No : 6
Coding index : 10
Diagnostic index : 85
Bus index : 13
Date of manufacture Week/Year : 12/4
-------------------------------------------------------------

I can not get any response from the dsc control unit now.(module failure??)

cleared the errors and went for another quick spin and got the following

Date: 06/28/15 19:01:38
ECU: D_EGS
JobStatus: OKAY
Variant: GS19A
-------------------------------------------------------------

RESULT: 1 errors in error memory !
-------------------------------------------------------------

20912 Message (Brake-Light-Switch) from DSC is not plausible


Warning: F_HFK doesn´t exist in result record 1 !

Warning: F_UW_ANZ doesn´t exist in result record 1 !

Warning: F_ART_ANZ doesn´t exist in result record 1 !

Errorcode: 51 B0 28
================================================== ===========
Ecu : D_0056 IFH-0009: NO RESPONSE FROM CONTROLUNIT
================================================== ==================================
Variant: ME9N62 >>>>>>>>>> No error found <<<<<<<<<<<
================================================== ==================================
Variant: LWS5_1B >>>>>>>>>> No error found <<<<<<<<<<<
================================================== ==================================
Variant: EHC_2N2 1 Error in error memory
Error registration 1 : 0x0032: CAN Bus <<<<!!!
Error accurances: 2
Error accure 1st time at:

Kilometer counter 163660.00 km
Battery Voltage 14.00 Volt
Reservoir pressure 15.63 Bar
Corner valve front right 0.00 0/1
Corner valve front left 0.00 0/1
Corner valve rear right 0.00 0/1
Corner valve rear left 0.00 0/1
Reservoir-valve 0.00 0/1
Exhaust-valve 0.00 0/1
Compressor-relay 0.00 0/1
Heigh-pressure-exhaust-valve 0.00 0/1
Crosslink-valve rear 0.00 0/1
Crosslink-valve front 0.00 0/1
Compressor-temperature 42.00 Grad Celsius
Vehicle speed 0.00 km/h
average height of car -5.00 mm

general errorr
--
--
--
--
Error code: 32 00 21 02 EE 3F 70 7D 00 00 52 00 FB 00

================================================== ==================================
Variant: D_0070 -1 Error in error memory
================================================== ==================================
Variant: LCM_IV >>>>>>>>>> No error found <<<<<<<<<<<
================================================== ==================================
Variant: D_0066 -1 Error in error memory
================================================== ==================================
Variant: D_009A -1 Error in error memory
================================================== ==================================
Variant: RLS_DS2 >>>>>>>>>> No error found <<<<<<<<<<<
================================================== ==================================
Variant: SD_DS2 >>>>>>>>>> No error found <<<<<<<<<<<
================================================== ==================================
Variant: EWS3 >>>>>>>>>> No error found <<<<<<<<<<<
================================================== ==================================
Variant: D_00C0 -1 Error in error memory
================================================== ==================================
Variant: ZKE3_GM6 >>>>>>>>>> No error found <<<<<<<<<<<
================================================== ==================================
Variant: SZM38 >>>>>>>>>> No error found <<<<<<<<<<<
================================================== ==================================
Variant: MRS4 >>>>>>>>>> No error found <<<<<<<<<<<
================================================== ==================================
Variant: IKI 1 Error in error memory
Error registration 1 : 0x00BD: EBV <<<<!!!
Error accurances: 44

--
--
--
--
--
Sporadic error
error external ECU
Error code: BD 90 2C

I have to give it quite of bit of gas to get it going as well like the wheels are slipping once over 3000 rev it feels fine but moving off or trying to move off very fast seems to be an effort which I think is because the front right is not gripping.

Any further help would be appreciasted.

[biggeek]

Ok sent the module of to BBA Reman in the UK.

£60 to test
£220 to fix
£500 to replace with a lifetime guarantee.

Well the good news is my unit was faulty. bad news is I needed a replacement.

so I bent over and brought the replacement.

More good news is that the replacement comes with the hydrolic pump...However I am a bit nerveous about removing and fitting the whole unit,. The TIS instruction seem to be simple

depress brake
unplug
Mark brake lines
remove brake lines
remove retaining screw
remove unit
transfer bracket to new unit

Installation is in reverse order.

run DIS test (inc. steering angle)


Is there anything I am missing? I know when brake bleeding (on my todo list) it is critical that no air get into to the system but I take it that this is not the case when removing the abs unit?

[David.X5]

It will get air. You will have to bleed it real thoroughly. Was there a reason you didn't buy just the module instead of the whole assembly? in the U.S. You can get brand new Bosch modules without the pump

[biggeek]

Hmm so it might be better for me to send it back and get a new part shipped from the states for less. It was really the lifetime warranty(even though we know what that means) but a quick search show price from 350-450 shipped to the UK which is still less than the £600(inc VAT ) I paid for the refurbed unit.


Hmm I need to bleed the brakes anyway so I might just bite the bullet and change both out. I have a pressure bleeder so hopefully that will help and I know I have to use GT1 to electronically bleed the unit.

I also thought I could just take the ECU off but there is a warranty seal on the unit I received from BBA so I will void the warranty. if I do separate them.

[biggeek]

latest update.

I decided to bite the bullet and swap over the complete hydraulic unit.

swap was fairly simple. I would advise people to take off the passengers( I am in the UK) wheel and wheel trim to get to the unit as well as removing the headlight as this gives you a few more angles of attack.

Trifecta and air sup lights lite up after the unit swap as expected.

I bleed the brakes but my right rear caliper bleed pin maybe lose as the stream of bubbles didn't stop at first. opening the screw further or tightening a bit got the bubbles to stop..went through about 1.5 litres of brake fluid working that out. oh buy 5 liters if it is your first time.

other brakes bleed fine. I also used DIS to expel the air.

Coded new unit via NCSExpert( I need to get a bit more familiar with this software...whilst not bricking my car )

Happy to say I have my brakes back. No errors returned...I have only done 100 miles but everything feels good, previously my issue would kick in after 10 mins driving.

Interestingly one of the errors in inpa was variant coding for ehc2. I was not aware of the link between dsc and ehc2

I would be very happy apart from the dent in the wallet and the fact that the strange transmission behaviour is the transmission are not due to getting bad signals from dsc....that is for another thread.

Oh I am also convinced that this is all self induced. I think I buggered the wheel bearing when hammering the axle back on, which then sent crap signals to the dsc which got worse over time. If that is the case tgen I am happy I fixed the mess and I learned how to get the axle on without pounding like crazy(small light taps with the axle socket works wonders) and I have new hubs and wheel bearings

[Ricky Bobby]

Glad to hear it was finally resolved. I had my ABS module rebuilt over the winter for $120 and it didnt clear my trifecta, replacing the brake light switch was my source of error and since replacing it i have not had a trifecta problem.