Porsche 911 Carrera Owner's Manual page 124

Stopping the timing
After time measurement is started, the on-board
computer display changes to the "Stop tim-
ing/Intermediate time".
Select "Stop timing" with the operating lever.
122
Controls, Instruments
Push lever forward. The time is stopped in all
stopwatch displays, and the on-board compu-
ter display changes to the "Continue/Reset"
selection.
The timing can be continued or reset to zero.
Note
PCM: After timing has been stopped, a prompt
asking whether the time is to be stored appears on
the PCM.
Continue timing
After timing has been stopped, the on-board
computer display changes to the "Continue/Reset"
selection.