Quote:
Originally Posted by hupchye
May be let me share what I have gone thru :
I have a 2010 320i E90 4cyl BMW. Thanks to Nikco43, I managed to install
- Radar sensor 6777883
- LDM module 6774206
- VW ACC Wiring Harness from Ailexpress
- ACC Stalk not 61319203109 but 61319203106 (it works)
- replace with Speedometer cluster 9284265 (I used a new/empty DOWQ160 chip to reset the mileage)
All coding successfully. Same to you MT, without replacing the DSC pump, I got LDM error code d024 and d026 wheel torque.
So I ordered a 6cyl DSC hydro braking pump p/n: 34516775396, 6775388, 6775389 from ebay. After replaced the pump, bleed all 4x brakes thru INPA, calibrate Steering Wheel sensor thru ISTA-D, calibrate DSC sensor and DSC pump thru INPA. Everything okay and went for a test drive, no speed show on Speedometer. Checked with INPA and ISTA-D, all 4x wheel no speed indication. So I checked in RealOEM BMW part catalog, this DSC braking pump must paired with wheel speed sensor 34526870075 & 34526870077. But wheel speed sensor 34526870077 only work with 6cyl BMW rear wheel magnetic encoder bearing and output shaft without reluctor ring. Only wheel speed sensor 34526870076 is compatible to 4cyl BMW with rear output shaft with reluctor ring. Now I am looking for any DSC braking pump which can pair with wheel speed sensor 34526870075 in the front and 34526870076 in the rear.
Hopefully this helps.
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My ACC retrofit into 4cyl BMW is almost come to a dead end.
After replaced 4x original wheel speed sensor (p/n: 34526762465 & 34526762466) with p/n: 34526870075 & 34526870076 (plug&play), 2x front wheel (34526870075) shows speed reading and 2x rear wheel (34526870076) still no speed reading. Tested wheel speed sensor 34526870076 with reluctor ring - no response, tested with magnet - RESPONSE !! During testing, can obviously being seen that this wheel speed sensor 34526870076 also send out data signal (AK-Protocol) even it is in StandStill position.
Now it is confirmed that rear wheel speed sensor 34526870076 require magnetic encoder to be operational. It is not responsive to reluctor ring. That means earlier problem was not due to 6cyl DSC hydro braking pump p/n: 34516775396, 6775388, 6775389. I think it accept both wheel speed sensor 34526870076 & 34526870077.
From my side, it is finalized that 4cyl engine BMW mechanically is not possible to have ACC. I have checked :
1) replaced with 6cyl DSC hydro braking pump to get rid of Wheel Torque error - Possible
2) physically replaced wheel speed sensor 34526762465 & 34526762466 with 34526870075 & 34526870076 - Possible
3) to replace rear wheel angular bearing with magnetic encoder type bearing - I think possible
4) to replace a set of new output shaft LK=80mm without reluctor ring portion (to give room for wheel speed sensor 34526870076 or 34526870077 to be functional) - I cannot find any in BMW parts catalog, except output shaft LK=86mm for 6cyl engine
Lastly. jz for my own experimental, I will try to convert ori 34526762466 signal (On-Off square wave from reluctor ring) "electronically" to simulate AK-Protocol for 6cyl DSC pump to be able to read. But it is not recommended for others to do. Jz for my own experiment and I think it will work ....