Badger5Monster Motorsport
Results 1 to 2 of 2
Like Tree1Likes
  • 1 Post By technics100

Thread: Engine mount solenoid, what is it?

  1. #1
    A bit slow!!!!

    Status
    Offline
    Join Date
    Jul 2006
    Location
    Limerick, Ireland
    Posts
    21

    Question Engine mount solenoid, what is it?

    I keep getting this error code:

    17994 - Engine Mount Solenoid Valves (N144/N145): Short to Plus
    P1586 - 35-10 - - - Intermittent

    It comes back after clearing it straightaway.

    Can someone point out to me how to inspect this apparently faulty bit?

    Is it a diy job to fix?

    Thanks!

  2. # ADS
    ADS
    Join Date
    Always
    Location
    Global
    Posts
    Many
     
  3. #2
    technics100's Avatar
    4th Gear

    Status
    Offline
    Join Date
    Feb 2004
    Location
    Co Antrim
    Posts
    774
    I had the same problem. Its probably the passenger side engine mount. On the later TDi's the mount has a solenoid which controls the rigidity of the mount..

    the way the mounts work is that there is a fluid chamber with a plastic body in the middle of it, with small channel cut through it. this allows fluid from the top chamber, through the plastic body, to the bottom chamber. the bottom chamber is rubber lined and can deform under pressure. there is also an airway vented to atmosphere, with a rubber membrane separating the fluid from the atmosphere. a solenoid valve, controlled by the motronic, can open or close the airway.

    below 1100 rpm (i.e idle), the engine vibrations are not enough to force fluid from the top chamber, through the passageway to the bottom chamber. the airway is open (solenoid valve open). the rubber membrane creates a soft cushion which absorbs the high frequency vibrations.

    above 1100 rpm the soleniod valve is closed which blocks the airway and so "hardens" the mount (the fluid has nowhere to go). thus the mount is effectively solid.

    the high frequency vibrations at speed are absorbed by the membrane (as in the idle case), while the more damaging low frequency vibrations cause the fluid to force itself through the chamber in the plastic body to the lower chamber, forcing the (lower) rubber chamber to distort - effectively absorbing the vibrations.

    in this case i would suspect that the mounts are bad - possibly as simple as the connectors have been pulled off.
    cathalferris likes this.


    2003 Silver A2 1.4 TDi - 65mpg & 30 a year to tax - ;-)
    2003 Atlas Grey A4 2.0 S-line - gone
    2000 Goodwood Green S6 4.2 V8 - gone

 

 

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO

Garage Plus, Vendor Tools vBulletin Plugins by Drive Thru Online, Inc.

Content Relevant URLs by vBSEO