Electronic Power Steering is violent and erratic after motor replacment

[Mm2810]

I found the solution to swap rhd motor on lhd car or viceversa. You just have to swap the yellow and white wires from the torque sensor. Now when you turn left, unit will think you are turning right, so the motor will spin in the right direction. I tested it for many days and everything works well. And if you are worried about dsc problems due to car thinking you are steering the opposite direction, the steering torque sensor is used just for steering assistance, the actual steering direction and angle is measured directly by dsc unit via the steering angle sensor, so the car will never know about the incongruent data

 

[Pingufo]

I found the solution to swap rhd motor on lhd car or viceversa. You just have to swap the yellow and white wires from the torque sensor.

Thank you, you have save me to buy another servo motor. Please , contact me in DM please.
Thanks again

 

[Mm2810]

I'm not allowed to dm yet. I just registered on this forum. If you have other questions you can write here so others can make use of information. Otherwise email

 

[Mm2810]

And guys always be careful during these tests, when i found out i put the wrong motor, my steering wheel started spinning left and right with an incredible violence, at the point it was hard to stop it. One moment i though it was gonna break my arm...

 

[CarnieZ4]

RESOLUTION ACHIEVED.
It turns out that you must not put a RHD power steering motor/module into a LHD car (or vise-versa), because the physical electrical control system is reversed. (or course it is, the module is installed backwards to it's designed intent)
So I sent my original unit into ECU testing. They turned it around very fast. It works now.
My efforts to save myself a couple hundred bucks were for naught.
Do it right the first time.

 

[Avecaesar]

Hi all!
I encountered this problem myself. I imported an EPS motor from the UK, and after installing it, the motor was acting crazy, thinking the steering wheel was turning in the opposite direction to where it actually wanted to go. I tried updating the ECU several times, but nothing worked. After searching for information about the connectors, I had the idea to swap the wires carrying the steering angle information from the wheel. These are known as the sine and cosine wires, and simply swapping one for the other solved the issue. I hope this helps someone out there. I'll attach some photos.

 

[enuff_zed]

Wow! Such a simple solution that none of us thought of. Well done and thank you for sharing.

 

[matthijsfh]

Oh boy am I happy with this post!

(Netherlands, so LHD)

I bought 2 EPS motors to fix my steering issue and not for a second thought about LHD vs RHD..... At least 1 is from a RHD car and the other one from the UK..... So probably both motors will be wrong and shake and vibrate.

Saw the wiring, was thinking about sort of same solution but did not dare to do it! But your posts convinced me! If one or both turn the wrong direction, I will make a patch and swap the 2 wires.

Keep you posted!
Greetings Matthijs

 

[enuff_zed]

[ref]matthijsfh[/ref], that's a great result for you. My apologies for intially worrying you and forgetting i'd ever seen this post.
Just goes to show the depth of knowledge and experience within this forum.

 

[matthijsfh]

Hai,

Update:
After quite some research, I am now confident I understand the LHD / RHD issue with these motors.

Yes, it's firmware only. Below 2 labels from motors, located on the cover of the electronics. I found these on the internet, with the motor still connected to their steering system, so left/right easy to determine.

The magic is in the red squares: LL and RL

In German:
LL = Links Lenkung = Left steering (most of world )
RL = Rechts Lenkung = Right steering (UK)

So far the only thing that clearly indicates which version it is. All other numbers seem related to hardware configurations, which are the same for both motors. Only the firmware inside is different.

Hope this helps someone in the future. My 1st new motor works, and, indeed turns in the "wrong" direction.
2nd Motor comes in today and is 100% RHD. So I will check my theory again.

Greetings Matthijs

 

[enuff_zed]

Well worked out. Thank you.
More useful information to tuck away for the future.

 

[matthijsfh]

Success (in 3 parts)

Part 1
Because I bought RHD EPS motors for a LHD car, I had to switch the 2 sensor wires:
I decided to add a connector. For future myself or anyone working on the car, it is completely clear something fishy is going on here. Tomorrow I will add a label to point out the 2 wires were swapped and need to be "unswapped" for a LHD EPS motor in the future. Unswap = pins out of connector, swap and back in.



This works like a charm. Thank you for the warning. That could have ended bad.

Grt Matthijs

 

[matthijsfh]

Part 2 - Airbag warning light
I removed the driver's seat to work easier under the steering wheel. Had to start the car to test the EPS and ended up with a "Airbag Warning Light".

Had that before, but forgot how to solve. INPA photos below show that the error is in the SBSL (Satellite B pillar left).




Clear the error memory and light goes out (assuming you did not brick anything for real).

Grtz Matthijs

 

[matthijsfh]

Part 3 - Sticky steering

All installed, driving around, nasty sticky feeling in the steering wheel. Did not want to make corners easily. Google, remembered sticky steering.

Forgot to make a photo of the eccentric ring before removing the EPS motor. Stupid.....

Move the ring, first attempt was bad. More stickiness. 2nd Attempt is great. Light steering again.
(Photo from google, not mine= RHD).


My EPS unit


So dont forget to mark the ring position before removing the EPS.

Greetings Matthijs

 

[enuff_zed]

[ref]matthijsfh[/ref], you've done a great job and a very useful write up. Well done.
Yup, always mark a datum line before you start.