Epas how it works

F

flybobbie

Elite
 Stourbridge
The steering on my car has annoyed me for years.

Only way to describe is that when i turn the wheel left almost immediately feel a resistance that provides feedback.
Yet turning right needs a good 10 or 20 degrees turn to feel resistance feedback.
It's like it has a offset null point. Fiddled with tracking many times, no difference.

Foxwell obd reader has a steering reset routine.
It said to set steering roughly neutral and reset. Then recheck tracking.
Well that never made any difference.

Until now. Instead of setting the steering wheel centre neutral, i turned it left about 30 degrees and then on obd reset steering.
So steering wheel still sits neutral, car tracks straight and the need to turn wheel more right to get response has nearly gone. Might be just couple of degrees.

So anyone know what measures steering angle. Is it potentiometer, hall sensor or optical disc.
If it had been a external sensor i would have unbolted and turned it.
Seems pretty much what the obd is doing.

Watched a guy on YT replace the electrics on the back of steering motor, but no shaft to that, just electrical connections.
Obd can measure torque, is that being used to sense position.
 
On my RX7 i had in the 90's, the workshop manual had you test steering with a spring balance attached to the bottom of steering wheel.
Compare the pull left and right.
 
Also had a mild clunk when turning the steering wheel at low speed.
Just assumed it was the steering lock.
On our E89 is the torque sensor on the steering shaft in the cabin?
 
Bobbie, it's mega that you've found a mate to exchange posts with you. Good show of social skills.
:poke:
 
I can see now there is a connector from the sensor to the motor.
I'll take that off at some point and give it a clean.
 
Interesting, i forgot to look at the older downloads for information. Lost a lot when a hard drive failed.
So it could be then that the torque sensor reset in the Foxwell obd won't actually force steering wheel to be offset, which was my concern.
It is just setting the neutral point, which what seems to be happening.
All this time the neutral point was offset, wish i knew this 10 years ago!
Thanks.
 
It feels like it needs a few degrees more.
So do i go 10 degrees left and reset so it adds to the existing new neutral,
or go say 40 degrees left and reset. But doesn't seem the thing to do.
Give it go 10 more left.
 
Well that didn't so work basically reset and give it go, several times until i was happy with the steering.
 
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