1990 R129 500sl wit ADS suspension

[Richard Moakes]

It doesn't look good if there is no return voltage. From what I can remember, if you open up the sensor, you will see the wires connected to a board from which the weight and strain gauge is suspended in a bath of oil. I can remember there being some very fine wires from the board to the strain gauge and I found one of them had broken. I attempted to repair it with solder, but it didn't last very long and I ended up buying a new sensor.

 

[Mirko]

Ok, I have nothing to lose anyway, so I'll attempt to repair.
If not I'll have to order one.
What would be the cause of code 6 and 14.
What would be nex to look into it
Thanks

 

[Richard Moakes]

For code 6, I would measure the resistance of the solenoid valves to see if they are as per specifications.

Code 14 always happens when you disconnect the battery and has always cleared for me by winding the steering from lock to lock. Do you have the original steering wheel? I believe that changing the steering wheel can cause problems. The sensor is on the steering shaft underneath the steering wheel, but I have never had a close look at it.


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[Mirko]

Thanks Richard
It's looks like original, I had the SRS sensor replaced by indi while ego, I tried to spot anything suspicious, but everything seams to look ok.
Sorry for stupid questions, but where the valve is located?
Regards

 

[Richard Moakes]

Hi Mirko,

The steering angle sensor is beneath those slip ring contacts you are holding in the second photo, so it should be next to remove from the steering column, but the indicator switch might come first, I can't remember. I have attached a picture of the sensor for reference.

There is a valve each side at the front, under the wheel arch liners towards the front of the car, it's on a mount with the accumulator sphere. Do NOT attempt to undo the nuts holding the mount to the car without soaking them in penetrating oil and working them very slowly, otherwise the studs will shear off the body. I have attached a picture of what this looks like for reference.

Keep going, I admire your persistence, ADS scares most people off by this point


reference.

 

[Mirko]

Thanks, also I found that there is a dust covered broken on both stouts, I already got the new ones, just was wondering if there's possibility to fit them without removing whole strouts.
Perhaps from the bottom?
Regards

 

[Richard Moakes]

Thanks, also I found that there is a dust covered broken on both stouts, I already got the new ones, just was wondering if there's possibility to fit them without removing whole strouts.
Perhaps from the bottom?
Regards

Sorry, I don’t think that will be possible.

You would need to uncouple the hydraulic connection at the top of the strut before lowering it down. I would also change the strut top mount rubbers whilst I had that apart.

You would then need to bleed the system, which will also be necessary if you have to change one of the valves.

 

[Mirko]

Sorry, I don’t think that will be possible.

You would need to uncouple the hydraulic connection at the top of the strut before lowering it down. I would also change the strut top mount rubbers whilst I had that apart.

You would then need to bleed the system, which will also be necessary if you have to change one of the valves.

Is this means I can replace the dust cover from the top? Or I'll have to realise the strout from the bottom as well?
Regards

 

[Richard Moakes]

If you mean the ribbed dust cover which covers the piston, then it must be replaced from the top. There is also a rebound stop under the dust cover on the piston which deteriorates and should also be replaced at the same time.

You need to be careful that the spring doesn't escape, so it will need to be held under compression or released slowly with a jack under the lower control arm which is a little dangerous but possible. In this way you can just release the top and leave the lower balljoint in place.

 

[Richard Moakes]

Hi Mirko,

Any progress to report?

 

[Mirko]

Hello
So far I replaced the speed sensor unit, and the code number 3 disappeared.
So the next step would be the steering angle sensor, and the valve solenoid.
I haven't taken the strouts out, to put the dust covers just yet. I'm just worrying if I'm disconnect the oil lines and if the pump is shut car would drop.
I'll try to eliminate all the codes what I have at the moment before I do anything else.
Thanks

 

[Richard Moakes]

Yes, the car would drop if you disconnect the hydraulic connection to the strut, so the whole front of the car will need to be supported.

I guess the sensor wasn't repairable? The new ones appear to be solid state, but they are awfully expensive.

 

[Mirko]

Yes, the car would drop if you disconnect the hydraulic connection to the strut, so the whole front of the car will need to be supported.

I guess the sensor wasn't repairable? The new ones appear to be solid state, but they are awfully expensive.[/QUOTE

Yes, the car would drop if you disconnect the hydraulic connection to the strut, so the whole front of the car will need to be supported.

I guess the sensor wasn't repairable? The new ones appear to be solid state, but they are awfully expensive.

 

[Mirko]

I was hopping that when I opened the sensor there will be some visible faults.
But couldn't find anything.
Bought the second hand one and is ok at the moment.
Thanks

 

[Mirko]

Ok, I swapped the steering angle sensor for the different one, but the fault code still appears.
I checked the wires under the steering but everything seams to be ok.
I can delete code number 6. But the number 14 is permanently on.
I just started to think to get rid off the ADS and fit standard suspension instead.

 

[Richard Moakes]

Ok, I swapped the steering angle sensor for the different one, but the fault code still appears.
I checked the wires under the steering but everything seams to be ok.
I can delete code number 6. But the number 14 is permanently on.
I just started to think to get rid off the ADS and fit standard suspension instead.

Did you reset the sensor, winding the steering lock to lock with the engine running?

Sorry if that’s too obvious a question.

 

[Mirko]

Did you reset the sensor, winding the steering lock to lock with the engine running?

Sorry if that’s too obvious a question.

Yes I did, probably 100 times now no luck.