HDC and air suspension inactive

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M

Mid-life-crisis

Active Member
Posts
116
Location
Northern Ireland
2002 L322 3.0 tdi
I'm getting HDC and air suspension inactive alerts and orange warning lights
For a while I was able to reset by steering lock but that doesn't work any longer
IID tool can reset it but the fault comes back almost immediately
IID reports fault 0x68 steering ecu fault, but the live steering angle looks ok. I've recalibrated it and I think I've reset the ecu ok
Any thoughts?
Thanks
 
Fully charge left to stand for an hour then checked 12.4v is as low as you want to go, a good battery should be 12.8v, with low voltage as you start the volts will drop even lower 11 something and ecu will have a hissy fitt.
 
Thanks, I'll do a wee test overnight.
BTW, how about an estimated chargefrom Tayna of £4,166.67 for delivery of a Bosch S5015 battery to Northern Ireland!!

That's what Brexit has done for us.
Thanks tomcat59alan for your reply to my other post and the offer.
Trouble is that the fare for a foot passenger (with cabin for the overnight leg) is £150 and its an 18 hour round trip
The local suppliers know that they can just charge more because they there's no way round it.
Thanks Boris
 
Think my battery is ok.
Measures 13.05v on no load after full charge and 12.5v after standing for a week.
I'm able to reset the fault using IID and drove 40 miles tonight without a problem.
But it came back.

IID says
Ox4 steering angle sensor fault during normal operation, and
0x62 Steering angle sensor initialisation
And something about steering angle plausability

So, Steering sensor fault? - except it looks ok on live data
 
the steering angle sensor has 2 claws that run round a carbon track the claws wear out and make intermittent contact,
changing it is relatively easy if your double jointed, there's a u tube video of the easy way to-do it
 
Try watching the steering angle sensor with the live data and watch for any jumps in the figures. A smooth slow turning of the wheel should reflect a smooth reading in numbers.
 
I haven't got round to watching the live data when the fault occurs, but a smooth turn of the wheel gives a smooth live data graph.
Funny fault. It seems to pop up if I've had to turn the steering hard when moving, but resets by itself between journeys.
Does that help the thought processes?
 
Here's my example of plausibility on a mercs van.
The customer came in with a grinding noise from the front right wheel.
The story was the column had been disconnected at some point to change the rack but the column had been turned 360° to the left and refitted.
This told the computer that the van was turning left but the wheels were going straight ahead at the same speed. The computer was allowing this until the van was turned left and the parameters would go Into overload and it would try to stop the wheel on the right from what it thought was overspeeding!!
Once we disconnected the colum and with live data returned it to its 0°/straight ahead position all was calm as the info the computer needed became plausible or acceptable. :)
 
Ok thanks
I'm (sort of) guessing that the computer gets it's information on the direction the car is pointing from the steering angle sensor and perhaps also from the front wheels abs sensors and possibly the speed sensor and then does some sort of calculation to check these all mean roughly the same thing. I can't think where else it could calculate steering angle info from.

If there was an abs sensor fault, I'm guessing that the abs computer would be rather more than a bit upset and that would show up in some other fault.

The live steering angle data looks ok and I've recalibrated it to centre using the IID tool.

The fault only shows if the wheel is turned (I think) more than 180deg and resets itself at pretty much every start up.

I suppose I'm just a bit reluctant to pile in and change the steering angle sensor without being sure it's the cause of the problem.

I'm not as young or bendy as I used to be, but then nobody who is still alive is.

So either I change the wiper on the existing sensor or the whole kit and caboodle sensor. Does anyone have experience of changing only the wiper on the existing sensor, and does anyone know if the IID tool can pair a new sensor to the car?
And just for good measure, the bonnet release cable has snapped!

Thanks
 
cant answer either but if your changing it top tip move seat right back and lay the end of a scaffolding plank in foot well with the other end supported at same height, lay on your back on plank and you can reach up to remove steering column comfortably
 
Well, there's good news and bad news.
The good news is that I got the steering sensor out and opened it. One of the wipers is knackered.
I got the new sensor in ok, but now my problem is that the steerkng column shaft isn't long enough to go into the clamp with the pinch bolt. I can put all 4 bolts into the bracket, but the shaft isn't long enough to go into the clamp. And no, I didnt take a hack saw to it.
Either the shaft from the steering wheel has shortened or the shaft from the steering box has moved. Neither will move.
Any thoughts?
Oh,
20211213_182626.jpg
20211213_182626.jpg
and the plank is a brilliant plan
 
Im guessing that inside the sterring column there's another splined joint that lets the steering wheel rake, and that the lower part of the shaft has got pushed up towards the steering wheel
Question is, how do i get it down again?
 
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