Hi

Does anyone know what would cause the ABS and other modules to show fault with the (C1b0092 (ob) steering angle sensor, which has been replaced and the problem still occurs.

The symptoms of this problem are:

Grating/brakes applying when going round corners (causing HDC fault etc to come on )
HDC Fault when turning corners generally.
Steering angle sensor incorrect operation code showing up on various modules (C1b0092 (ob)

Steps taken to try and resolve:
ABS unit sent to ECU Testing - no issues found
Steering Angle Sensor replaced, recalibrated to car etc, etc (No fault codes come from the actual SAS module)
Wheel speed sensors all checked sorted (one was faulty, but was replaced, didn't solve problem)
EAS all working OK
No obvious steering problems or issues with the physical vehicle
Gearbox all working fine, was refurbished last year and this didn't solve the issue either
All fuses OK , none blown etc.

Car runs and drives fine with no warning lights or anything else until a corner is turned.

Note: When the HDC fault has tripped, the car drives perfect, albeit without any ABS and low suspension etc.

It seems to me the problem is somehow to do with the ABS unit which is pretty much wired into every system in the car, but this showed up no faults at testing?


Therefore it seems the ECUs of the ABS and the vehicle body processor module (HDC) and others are tripping on a false error code from the SAS, but the SAS itself is clearly not the problem.

Any ideas welcome , as exhausted pretty much all I can think of here.

Many thanks in advance, Oliver

When the wheels are straight ahead, are they shown as such on the 4x4i screen - and when the steering wheel is turned, does this reflect in the wheel direction on the screen?
Are the wheels & tyres all the same & correct size and within a few mm in terms of wear?
Are the tyre pressures OK?
Are all four wheels roughly the same height in the wheel arch - no need to measure, just 'by eye' on a level surface?

Hi

thanks for your reply.

Well the Radio/head unit/screen packed up a while ago and the whole stereo and other black box drivers from the rear left of the boot have now been removed. So there is no 4x4 data showing on the screen like that (screen is just white/blank when car is on), however I would note that this issue was occurring before the stereo/head unit drivers were removed or went faulty so I can't believe this is the issue. Before the AMP blow, as far as I recall, the 4x4 screen did work and showed things the way they should be.

As to to the other points, these are valid points but unfortunately have all also been ruled out and were mentioned as possible causes by ZF when they did the gearbox, and eliminated.

Regards
OLIVER

I didn't suggest the 4x4i screen was the issue, I was asking if the steering position shown was plausible, using the screen is a quick & easy check.
Do you have access to any diagnostics that can read live data from the SAS?
It is possible that your replacement SAS is faulty or not fitted correctly, without any means of confirming the output signal is correct and reflects the steering angle input, anything else is guesswork.

Hi ,

Just been out and plugged in IID tool and checked live values on SAS and also wheel speed sensors all working properly or appear to be, unfortunately no luck and same issues prevail when turning. SAS also checked again at 0 degrees and recalibrate at that point incase it was off when last calibration done, unfortunately no change.

The message about faulty SAS signals prevails yet this part has been swapped three times to no avail.

Somewhere there is a false signal being generated.

Cheers

What reading do you get one complete turn to the left & one to the right from centre?

You now mention it has been replaced three times - with a new, genuine part each time? Are you sure it's been fitted correctly?

What is the part number of the item you've had replaced?

Hi there

Just been out again and plugged in IID, so its showing 0 at centre then -623 degrees full left ( give or take 1 or 2 degrees depending on force ) and the same but positive to the right starting from 0 in the centre . So basically 623 each way.

The SAS is part number SRO500110, and this was first changed to try and stop this fault by a certain garage, who said it made no difference substituting in another identical par from another LR there, I was skeptical so bought another one off ebay, added that, and some issue prevails.

Its actually pretty easy but fiddly to get it off and check it is installed properly, take off under panels by brake pedal, steering col housing, remove steering assembly and pinch bolt front of bulkhead, slide out , remove SAS , replace SAS, all back together again. I honestly can't see how it can be the SAS since its been checked and re checked and itself doesn't show any codes, as the faults are being logged from the AbS and Vehicle dynamics modules . Its held on by three Torx scres and is not mis-seated for example , its easy to see its on right when the whole steering column is in your arms .

I reckon it might be time to replace the actual ABS module/ unit itself as everything seems to revolve around that ( despite it being tested by ECU testing in Bham who said it was OK).

Cheers

The 'one complete turn' readings would have been better at showing any anomalies but it seems to be giving the correct -/+ orientation.
Two more things to check - is the car configured as LHD or RHD in the CCF?
On a drive, with constant speed (doesn't have to be fast, but over 18mph) in a straight line, what are the Yaw Rate and Lateral Acceleration values?
Both should be close to Zero, dependent upon your diagnostics, they may be in ABS or Vehicle Dynamics.