Get out your Bentley.  It tells (I don't remember where) which pins on the AFM connect to which pins on the ECU.  Check 'em all for continuity.  I ended up re-soldering a couple of them that showed high resistance.
Good Luck!
Gary
  ----- Original Message -----
  From: S. Marie Arnold
  To: vanagon@GERRY.VANAGON.COM
  Sent: Thursday, June 07, 2001 12:32 PM
  Subject: HELP airflow box problems

  I am needing help again with this darn Vanagon!  I have gotten the problem
  down to two things 1- the plug that goes into the Airflow box or the wiring
  harness.  The plug looks fairly new but I am not sure if it is wired
  correctly.  Does anyone know what color goes with what number.  And how can I
  tell (if this is at all possible) if it is the harness.  Is this a big thing
  to fix.  I know the harness cost about $200 to buy.  What is involved with
  this.  Does anyone have any suggestions?  This has been an ongoing problem
  for 5 months and I have invested mucho bucks in mechanics for no one to get
  the problem fixed.  PLEASE HELP!

  Stace
  Vanagon 1991 Carat

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