M104: can't obtain diagnostic readout
Wanted to obtain a diagnostic readout on my 95 E320 so searched the archives for the procedure. Per instructions, the ignition was turned to the ON position until the warning lights, etc were on. Then I pushed the button on the diagnostic connector for 2-3 seconds and released with no results. When the button was pushed the light energized as expected and went out when the button was released. I thought that if there were no faults stored that it would flash one time to indicate that.
Am I doing something wrong or is it possible that there is a malfunction in the testing circuit?