NFA Fabrication

I have a 1990 300TE 4Matic wagon, and the 4Matic light is on with a code "9" (Got the code by doing the blink code procedure). According to the info I have found, This indicates a problem with "Hydraulic valve 2, short or open circuit". I have tested the ohm reading for for valves 1 and 2 by removing the over-voltage relay, and checking the resistance between pin 9 of that socket (Which goes back and splits to power both the #1 and #2 valves, and pins #4 and #6 of the 4Matic control unit connector.

I get roughly 6 ohms between pin #9 of the over-voltage relay and pin #4 of the 4Matic control unit connector, and the same between pin #9 of the over-voltage relay and pin #6 of the 4Matic control unit connector. Those 2 pins of the 4Matic control unit are the ones that control the #1, and #2 Hydraulic valves. Being that they both test the same, and I only have a code for valve #2, I am leaning towards a possible 4Matic control unit failure.

I am new to the forums, and hope someone has any idea of how to proceed, I just don't want to jump to conclusions and start replacing parts based on assumptions, as that can get expensive very quick! Thanks in advance for any assistance!

Edit: I have added wiring diagram pics (Small one posted), Larger version in link for easier viewing:

http://i52.tinypic.com/bf5b0l.jpg

raymond g-

i dont have an answer, but i am intrigued by your sobriquet.....as in tax stamp SOT ?

NFA Fabrication

You have completely lost me. "Tax Stamp SOT"?

raymond g-

PMed

NFA Fabrication

Cleared up! The NFA in "NFA Fabrication" Stands for the Car Club "NFA c.c." Founded in '97 In Kirkland Wa.

makko

Hi! What happened with your 4matic? Did you solve the probs? Are you an expert on any 4matic issue now? I am looking for all kind of documentation to troubleshoot my car. Just got it and guess what, 4matic orange light ON. Yes. Do you still have the documentation you posted above?