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Old 12-19-2002, 07:56 AM
stevebfl stevebfl is offline
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Diagnosing control units is the worst of business, but I would take my car to a tech who stands by his diagnostics.

If I diagnose a control unit and I install it and it doesn't fix the car the part comes back off and becomes inventory. If I diagnose a control unit and you replace it and its not the problem it becomes your inventory. Depending upon risk the amount of testing changes.

For a car like yours I would monitor two outputs: EHA current and Idle speed valve current. if they were wrong and the basics to the controller were right I would make the call, I would get a used controller (actually I probably already would have one) and confirm the diagnosis. The customer would pay less than half the price of new.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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