Help required S Class w220 2005 - Mercedes-Benz Forum
 
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post #1 of 7 (permalink) Old 06-02-2019, 12:31 AM Thread Starter
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Help required S Class w220 2005

Hi Guys
I have been trying to work on a fix in one of my soft close doors / heres the story - all soft-close works except the passenger door - it works for 3 or 4 times after i reset the pump fuse - whenever i close any-door or boot the PSE pump runs for about 18 seconds - i have checked for air leaks NONE and just last week replaced the whole door lock AGAIN (2nd one) etc I STILL HAVE THE SAME PROBLEM - my friend run the puter on it and all we got was

PSE - Pneumatic system Equipment / FAULT - code B1442-012 over servo turnoff safety time ,

Getting very frustrated Can anyone help here

cheers
Thanks
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post #2 of 7 (permalink) Old 06-02-2019, 04:54 AM
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Since the other circuits work, I think you have a leak in the circuit for that door.

You said that you don’t but the computer shows that the pump runs TOO LONG on that circuit. After running too long, the pump will shut down that pneumatic circuit to protect the pump from overheating.

Pulling the pump fuse resets that protection, but the pump faults again when it runs too long and shuts down that circuit.

Until you find the leak (which you do have) this circuit won’t work correctly. Pulling the pump fuse over and over will simply cause the pump to run too long, and it will shut down again to protect it self.

The leak may be in the vacuum lines, not just in the actuator, though the actuator is common.

One final thought, given the age of the car, the pump itself may be getting weak and this one pneumatic circuit is the “canary in the coal mine”. I would check pump output pressure as well.

When you hook the car up to the computer, have your friend print out the troubleshooting steps for that fault. You need to find the leak, or determine the pump condition, and for that, the MB troubleshooting steps from STAR are the best way to proceed.
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post #3 of 7 (permalink) Old 06-02-2019, 07:04 AM
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All of the above /\ /\ /\ +1

Now, assuming there is no leaks and PSE Pump is good .......................

One thing I'd like to know, does that particular door put the Interior Dome Lamp on when you open it ? If it does not and the opposite Door does, change the Pin Switch under the Latch Keeper on the door pillar

If Interior Dome Lamp is working fine, then I would suggest you examine very carefully the state of all the Micro switches inside the Door and Lock Mech ............., open or closed in "Actual Values", do this first on a good (Drivers) door, then compare the results for each Microswitch on the faulty door.


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post #4 of 7 (permalink) Old 06-02-2019, 10:46 PM Thread Starter
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Thank for quick responce - will check that today off hand i think the interior light works off both front doors

cheers
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post #5 of 7 (permalink) Old 06-02-2019, 10:52 PM Thread Starter
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Astro14 -
Thank you for that valuable info -

- ill keep you posted

cheers
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post #6 of 7 (permalink) Old 06-03-2019, 05:49 PM Thread Starter
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Hi
I thought i would try a new PSE pump as this one is now quite old - can anyone tell me what part number it would be for original or aftermart
Heres my chassis No. WDB2200672A442136 9

cheers
Thank you
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post #7 of 7 (permalink) Old 06-07-2019, 04:03 PM
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I think that all of the PSE pumps have been updated to a new part #.

So, it doesn't matter, you're getting the latest part number if you get a new pump.

Here's the key point: each installation is different, so you MUST code the pump with SDS to ensure that the rest of the car knows which circuit does what and you MUST keep track (label) each hose going into the pump for the new pump to work at all.
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