Sorry - can't find the original question on my HDD, but should be obvious...

Re: Diagnostic code what MODE: mean please explain [850][1994turbo]... posted by Dave the Volvo Tech  on Friday, 1 December 2000, at 9:14 p.m. ...in response to "Diagnostic code what MODE: mean please explain" posted by Mrsha.
 

                      Mrsha-
                      Mode is the type of diagnosis you are asking the system to do. Mode 1 is entered by pressing the button
                      once and waiting for the fault code to be displayed. Press the button twice and it goes into mode 2 that
                      confirms the signal that you have entered, like moving the gear shifter and it will tell you that signal from
                      the shifter is correctly received by the control unit. Press the button three times, and it goes through a
                      sequence of activating components, like the shift solenoids. Mode 4 (press 4 times) you tell the control
                      unit which component you want to activate. Mode 5 (press 5 times) is used to read out sensor values,
                      like oil temp and gearbox RPM. Mode 6 (press 6 times) is used to reset the adaptive functions in the
                      control unit. These are examples of trans modes. Engine modes run from 1-3, some systems don't use
                      consecutive modes, like cruise uses 1, 2, 4, and 5.

                      --
                      Dave the Volvo Tech