This is from a thread I started about a year ago..........


Update: the rest of the story.....

Problem is back, below is description of problem.

Installed rebuilt unit in a 1995 E320 Sedan.
Initially the unit operated correctly, 2 days later, operation became
intermittent. Symptoms are intermittent high idle speed (1400 RPM in park,
1000 RPM in gear) and inoperative cruise control. (either both symptoms are
present, or neither are present. never one without the other) Shutting off
the car and restarting will sometimes cure both problems, but they both
reoccur. Retrieval of stored fault codes (via impulse code reader, not HHT)
consistently yields the following:

Diagnostic module: code 6: Idle speed control inoperative

ECU module: code 8: Idle speed control (ISC) system at upper or lower
control stop

HFM SFI module: code 2: EA/CC/ISC control module (N4/1) or Safety contact
switch (M16/1s1) or Stop lamp
switch or Cruise control switch or Actual value potentiometer or Starter
lock-out/back-up
lamp switch or engine speed signal or vehicle speed signal or closed
throttle position
switch or safety relay in EA/CC/ISC control module

Out of desperation, I replaced the remanufactured unit with a known working
unit pulled from an identical fully functional vehicle. Idle speed/cruise
control now work properly. So far, there is no indication of intermittent
failure.

Returned unit to Beckmann for testing, they confirmed reman unit was defective. (the drive motor was bad)

Hope this story helps someone else........................