Mercedes-Benz ML500 AIRmatic issue

Simon Diagnostician Auckland, New Zealand Posted   Latest   Edited  
Question
Chassis
2006 Mercedes-Benz ML500 5.0L 7-spd
Airmatic

Hi Guys

I have a 2006 Mercedes-Benz ML500 with an AIRmatic issue. 

A previous garage has fitted a replacement compressor and a left rear height sensor. The car came into my customers garage with uneven rear heights. The garage used the switch on the dash to raise the car and after that it would not come down and was stuck on full height. 

Using Autologic I managed to automatically lower the vehicle to its programmed height but when I try to save the calibration the tool tells me the calibration has failed. I tried it with the Autel tool with the same results.

The programmed heights show -30mm. I tried to set the heights to 0mm and it still fails.

Is there some prerequisite set up that I am failing to do that the scan tool and WIS doesn't tell me?

0
George Owner/Technician
Fairy Meadow, Australia
George
 

Hi , Check the rear height sensor is fitted in the correct way, they can be put in upside down. Regards George

+1 Ð Bounty Awarded
Simon Diagnostician
Auckland, New Zealand
Simon
   

Thanks George, I did check for that, also if that was the case I would expect the ride height for that sensor to be reversed. However, I will double check. Regards Simon

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Joseph Technical Support Specialist
Commack, New York
Joseph
 

Hey Mr. Simon Frosey, Put the truck up in the air. Make sure the joints on the level sensors aren't binding due to rusting. Disconnect the link from the sensors both left rear and right rear ( this is going to be a comparison test since there is a new sensor installed ). Access actual values on your tool and look for the voltage readings. Now, on the screen, get both sensors to 2.5V. Once

+1 Ð Bounty Awarded
Simon Diagnostician
Auckland, New Zealand
Simon
   

Hi Joseph Many thanks for the detailed information. Can I clarify one point. You said to raise the vehicle off the ground to check the suspension components. I presume the inclination reading is done with the vehicle on the ground? I will try what you have suggested but I will probably ship it to the dealer if there is any doubt with the results. Regards Simon

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Joseph Technical Support Specialist
Commack, New York
Joseph
 

That is correct. The preference is on an Alignment rack but the shop floor is fine if it too is leveled. I really hope this helps you out. Just let me know of your results

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