Disco 3 (LR3) Steering Angle Readings....Curious!

Good evening 'Zoners....

We have a 2007 D3 GS - a few faults which I am working my way through....Vehicle Dynamics Module mostly (stupid thing!)

One query I do have is a curious one. Steering Angle Readings.....

According to ABS and the SAMS(?) readings when dead ahead they read 0deg...great!

According to the VDM it is in the region of +775deg >>>???

So, I remove the steering wheel (so we don't over turn the slip ring (clock spring)) disconnect the steering column at the joint just past the angle sensor and turn the steering column two full turns (I know that would only be 720deg but for this purpose is close enough).

I put the steering wheel back on and check the readings (his is before I recal the SA)....

The ABS and SAMs(?) modules now read -720deg but the VDM now shows 55deg.....

OK so lets recal the SA - all done.....

Now the ABS and SAMS(?) reads 0deg....but the VDM now shows +775deg once again!!!! WTF....

Could I ask some kind soul who has the ability to read live data check what there ABS module, the Steering Angle Module and the Vehicle Dynamics module are showing for their steering angle data please just so I can see if I am getting spurious readings or if indeed they are meant to be so wildly different.

Many thanks to whomever can help in getting these readings!

Evening Ant mate long time no see. I will check my D3 for you with my gap tool but the problem is almost down to the ring on the steering colume comming loose and give the steering angle sensor wired data that in turn bugger up everything else.

Iv just had to fix mine recently I can't post photos of the repair because of the post pics issue with landy zone but il go find my link to the other site....back in 5 mins

Here you go a big write up on the issue I'm on that site as Lrstayor I used a syringe and super glue to get the glue where it needed to go.
Then a steering angle sensor reset

https://disco3.co.uk/forum/steering-angle-sensor-sleeve-repair-138700-60.html

Cheers Dave, appreciate the replies and the link which I will read with zeal....It has been a while as life, kids and jobs all get in the way - but I am trying to be more 'online' than I have been the last 18 months or so! I trust you and yours are well also and Land Rover life hasn't dragged you down too far!

From what I can ascertain - the sensor reads correctly and will go up and down the scale with no issues or spikey readings - and will always read the same at the extremities of the travel and will will read 0 when in the straight ahead position without deviations - so I deduce from this that the sensor is still in good order with the shaft and reads accordingly.

My curious readings of the VDM reporting +775deg when the ABS and the SA module themselves read 0deg is what confuses me...and also when I disconnet the steering column and physically turn the SA to read 55deg - the ABS and SA report in at -720deg - so I recalibrate teh sensor so the BAS and SA both now read 0deg - the VDM jumps back to +775deg....

If you are able to get a reading using your IIDTool - that would be grand just to see if the VDM does indeed report a figure so wildly different to the ABS and SA.

Hi Ant

Plus 1 what’s already been mentioned and hope u don’t mind but may I plse add regarding the ABS module , normally a canbus test will see if the ABS has issues , here’s some test data I wrote out

almost forgot , are all ur bulbs ok and brake lights come on , know the brake pedal switch can also cause problems

hope this may also be of use to u

With both battery leads disconnected from the battery posts

Multimeter set to ohms, ( TP Is just short for test probe from ur multimeter)

TP to pin 6 other TP to pin 14 , read ohms

TP to pin 3 other TP to pin 11, read ohms


Reconnect battery, ign off , meter set to Vdc

TP to pin 6 other TP pin 4 Read Vdc

TP to pin 6 other TP to pin 5 Read Vdc

TP to pin 14 other TP to pin 4 Read Vdc

TP to pin 14 other TP to pin 5 Read Vdc

Bit more info for u

biketeacherdave said:

Here you go a big write up on the issue I'm on that site as Lrstayor I used a syringe and super glue to get the glue where it needed to go.
Then a steering angle sensor reset

https://disco3.co.uk/forum/steering-angle-sensor-sleeve-repair-138700-60.html

Click to expand...

Brilliant video u done there mate

gstuart said:

Hi Ant

Plus 1 what’s already been mentioned and hope u don’t mind but may I plse add regarding the ABS module , normally a canbus test will see if the ABS has issues , here’s some test data I wrote out

almost forgot , are all ur bulbs ok and brake lights come on , know the brake pedal switch can also cause problems

hope this may also be of use to u

With both battery leads disconnected from the battery posts

Multimeter set to ohms, ( TP Is just short for test probe from ur multimeter)

TP to pin 6 other TP to pin 14 , read ohms

TP to pin 3 other TP to pin 11, read ohms


Reconnect battery, ign off , meter set to Vdc

TP to pin 6 other TP pin 4 Read Vdc

TP to pin 6 other TP to pin 5 Read Vdc

TP to pin 14 other TP to pin 4 Read Vdc

TP to pin 14 other TP to pin 5 Read Vdc

Click to expand...

Thanks for the above - these are my results - they mean nothing to me - could you detail what results they should be?

6-14 = 59.8 ohms
3-11 = 62.2 ohms

6-4 = 2.4V
6-5= 2.4V
14-4 = 1.33V
14-5 = 1.33V

Are these good, bad, indifferent?

I am not 100 percent, but think the actual readings mean squat, so long as the car has been told X angle/degree = straight ahead ie calibrated then that should be okay.

I do think by spinning the wheel two full turns with the shaft disconnected you are in danger of shagging the clock spring.

lynall said:

I am not 100 percent, but think the actual readings mean squat, so long as the car has been told X angle/degree = straight ahead ie calibrated then that should be okay.

I do think by spinning the wheel two full turns with the shaft disconnected you are in danger of shagging the clock spring.

Click to expand...

I removed the steering wheel first to prevent over turning the clock spring.....

Saint.V8 said:

Thanks for the above - these are my results - they mean nothing to me - could you detail what results they should be?

6-14 = 59.8 ohms
3-11 = 62.2 ohms

6-4 = 2.4V
6-5= 2.4V
14-4 = 1.33V
14-5 = 1.33V

Are these good, bad, indifferent?

Click to expand...

Many thks for the results

everything looks fine apart from the last ones 14/4 and 14/5 as should read around 2.4 - 2.5 Vdc

enclosed a picture for u, which shows 14 is ur can low and 4 chassis ground / the other 5 is ur signal ground

therefore I’m wondering if u have a bad earth, various places of the earths are , behind ur drivers side wheel arch liner , behind the drivers side headlight and behind the passenger side wheel arch liner

know the other guys here being @biketeacherdave and @lynall are vastly more knowledgeable than myself so maybe they know exactly where to go

Plus just done some digging through some of my manuals for u as wanted to pin point the earth point of the steering wheel angle sensor for u , it’s on the RH A pillar

just hope it’s useful to u

ps, will try and find out exactly where it is for u

Found it, ref C2627 , alas might be a red herring but thought at least if u have the info just in case

Personally I used a wire brush attachment on my dremel, so after removing the earth terminal, cleaned the post and terminal, then reinstalled with some copperslip, of course not wishing to try and teach u how to suck eggs

The steering angle sensor measures the steenng wheel angle and the rate of change of the steenng wheel angle known as the steering wheel angle speed). These measurements are outout on the high speed CAN bus. together with a guality factor signal. and used by the ABS module for CBC and DSC operation.

The steering angle sensor is fixed to the pivot bracket of the steering column by three screws. A gear wheel in the steering angle sensor engages with a plastic drive collar fixed onto the lower shaft of the column. Inside the steering angle sensor the gear wheel meshes win a gear train containing magnets. An elon on electca connector provides the interface between the vehicle wiring and integrated circuits in the steering angle sensor.

The steering angle sensor uses the Magneto Resistive (M) effect, which evaluates the direction of magnetic fields, to measure the angular position of the lower shaft, and thus the steering wheel angle. When the steering wheel turns, the steering column lower shaft rotates the gear wheel in the steering angle sensor, which drives the gear train and rotates the magnets on the gears. The direction of the maonetic rields is constantiv monitored ov the steenno angle sensor and converted into a steering wheel angle and steering wheel angle speed.

The steering angle sensor performs a plausibility check of the steering wheel angle each time the following conditions co-exist:

The vehicle is traveling in a straight line.

The vehicle speed is between 20 and 25 km/h (12.5 and 15.6 mph).

The transter box is in hian range.

The brake pedals not pressed.

There is no ABS, DSC or ETC activity.

The steering angle sensor uses inputs of wheel speed, yaw rate and lateral acceleration to determine when the vehicle is traveling in a straight line. When all of the conditions co-exist, the steering angle sensor checks the steering angle, which should be us balthe steenna anole is outside the limits on two successive checks. the steenng angle sensor changes

the qualty factor signal to 'outside specitication for the remainder of the janition cycle and stores a fault code. At the beginning of each ignition cycle the quality factor signal is reset to within specified accuracy'.

The status of the steering angle sensor can be determined using T4.

If the steering angle sensor is replaced, the new sensor must be calibrated using T4. The steering angle sensor must also be re-calibrated any time it is disturbed from the steering column, or if the upper and lower steering columns are separated

Also hope this is useful to u

Thanks for the awesome information above.

I have checked the earth point and that is sound as a pound.

Curious to see the system corroborates the steering angle with the Yaw and Lateral Sensors too.....I wonder if this is where part of my problem lies as I have Yaw and Lateral Circuit Faults also stored....but that shouldn't cause the different readings I am sure.

Also, if I remove the SA sensor and rotate it to read 0deg in the VDM - it over reads in the ABS and SA module - so you do a reset and then the ABS module and SA Module both read 0deg - but the VDM over reads again!

I have swapped the Yaw sensor for a replacement and the same faults remain....hmmmmm

Here is a video of the curious readings! (the scrapping noise is because I haven't fitted the steering wheel surround back in place and the wheel is rubbing on it!!



Enjoy!

These are the lights I an trying to get rid of!

OK - my brain hurts now - how can I have the exact same fault with a replacement Yaw Sensor and a replacement ABS module - have run replacement wiring between the two, and no matter what combination of any of these, it is the exact same fault, and the exact same live data readings....???



Grrrrr.....

Hi, what's the exact fault code you get though?

sierrafery said:

Hi, what's the exact fault code you get though?

Click to expand...

It is shown in the video - Yaw Rate Sensor Circuit Fault and Lateral Accelerometer Circuit Fault

Also, In a number of other systems 'Invalid Data Received From Vehicle Dynamics Module' which is the erroneous Yaw and Lateral Sensor Readings (which are also shown in the video).

IMO that generic fault code is not enough to get to the root of that fault cos the C0198 has 9 subcodes, the 0197 has 8 some of them directly related with the orientation or instalation of the sensors, IMO you'll have to use a more reliable tool to diagnose this and follow the exact procedures from the WSM cos these vehicles are very sensitive in this area, see the document https://docdro.id/sD144vV