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  #1  
Old 07-13-2016, 01:49 PM
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4 Corner suspension - rear left low

Hi guys - thought id start trying to sort all my issues out and suspesnion is first on the list.

The rear left corner is / was low. Would go up and down but always be too low. It looked to have a new level sensor on that corner too.

The compressor cuts in as it should and creates 15 bar pressure and there are no signs of air leaks.

The ride height voltages were all over the place so recalibrated them with the snapon scanner and now have a bit more of a level vehicle !

It will do normal height and raised height pretty much as it should howver it never gets to fully low - it gets most of the way and the low position just keeps flashing.

The sensor voltages and deviations look to be pretty equal but ive got a few questions !

When raising the suspension all the voltages seem to go up apart from the front left which seems to go down - is this normal ?

Also when calibrating the height the scanner asks is it has sport or comfort suspension and if its on a standard or modified bmw chassis - how do I know the correct answer for these questions ?

Finally when entering the heights I want measuring from the bottom of the wheel rim to the bottom odge of the wheel arch - is this correct ?

Many thanks
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  #2  
Old 07-13-2016, 02:28 PM
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Quote:
Originally Posted by Paulpen View Post

When raising the suspension all the voltages seem to go up apart from the front left which seems to go down - is this normal ? Not sure

Also when calibrating the height the scanner asks is it has sport or comfort suspension and if its on a standard or modified bmw chassis - how do I know the correct answer for these questions ? I would use DIS /GT1 factory scan tool - it is Comfort Suspension if it has 2-axle air, and I would assume Standard chassis

Finally when entering the heights I want measuring from the bottom of the wheel rim to the bottom odge of the wheel arch - is this correct ? This is correct

Many thanks
Sometimes its the actual EHC module itself which goes bad, which may indicate why it never gets to the lowered height and the button keeps flashing -
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Old 07-13-2016, 02:35 PM
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You have to code the heights , You will need someone with the program and do each wheel.
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Old 07-13-2016, 03:07 PM
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Many thanks guys

I was setting it as sport suspension due to it being a 4.8 and the BMW vin decoder showing it as having option 226 - sports suspension settings. Might give it a go with the comfort then !

Is there anyway of fully diagnosing the EHC module via testing etc ?
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Old 07-14-2016, 05:08 PM
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Heights all calibrated many times and still proving troublesome !
It will do standard height and offraod height fine. Putting it to access height will result in it lowering but the low position light will just keep flashing.

Drive it around for a bit in normal height and the tyre pressue light and suspension inactive warnings will come on.

Igntion off and on and then read the codes - a pair of codes in the ABS ECU (5F1E variant code) and (5DD7 height invalid).

Data list shows that the front left deviation from satndard value is 1800mm !

Reset and calibrate all the ride heights again and all back to the start until the fault pops up again on driving !

Is there a standard spring conversion for all round air setups....
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Old 07-14-2016, 05:38 PM
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Do you have the "Self Level Susp. Inactive" message?
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Old 07-14-2016, 06:11 PM
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Originally Posted by 4.8iS Le Mans_NZ View Post
Do you have the "Self Level Susp. Inactive" message?
Afraid so
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Old 07-14-2016, 07:36 PM
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Quote:
Originally Posted by electricalserv x5 View Post
You have to code the heights , You will need someone with the program and do each wheel.
I asked my BMW dealer to do this but they said it is very a complicated process as it inputs false values in order to trick the system.
True or false?
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Old 07-15-2016, 01:51 PM
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I cant see why you need to lie to the system - we have been measuing from the bottom of the wheel rim to the wheel arch and inputting the value and it levels itsself out from there.

Its when driving or adjusting via the level switch the issues happen
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Old 07-17-2016, 09:02 AM
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THough id chuck a recap in so I know what ive checked and may help others in the future - not fixed it yet though !

The rear left corner was low. Would go up and down but always be too low. It looked to have had a new level sensor on that corner too.

The compressor cuts in as it should and creates 15 bar pressure and there are no signs of air leaks.

The ride height voltages were all over the place so recalibrated them with the snapon solus and now have a bit more of a level vehicle.

It will do normal height and raised height pretty much as it should however it never gets to fully low - it gets most of the way and the low position just keeps flashing.

The sensor voltages and deviations look to be pretty equal (as long as the left front voltage should work in revers to the other three corners) and the deviation measurements also look ok until the system faults - thats when front leaft reads -1800mm.

Also when calibrating the height the scanner asks is it has sport or comfort suspension and if its on a standard or modified bmw chassis - Ive been using comfort (cross referenced part numbers to types of airbags) and standard chassis (modified seems to be if you want to set a specific ride height).

Heights all calibrated many times and still proving troublesome.
It will do standard height and offroad height fine. Putting it to access height will result in it lowering but the low position light will just keep flashing like its not fully down. Pushing the button three more times will means it lowers slightly three more times.

Drive it around for a bit in normal height and the tyre pressue light and suspension inactive warnings will come on.

Igntion off and on and then read the codes - a pair of codes in the ABS ECU (5F1E variant code) and (5DD7 height invalid).

Data list shows that the front left deviation from standard value is -1800mm whereas all other corners are 0 plus or minus a couple of mm.

Reset and calibrate all the ride heights again and all back to the start until the fault pops up again on driving !

Im suspecting the air suspension module now but wondered if anyone has more data / ideas than ive got ?
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