Porsche 928 - WORKSHOP MANUAL 1977 Workshop Manual page 159

44
Wheels, Tires, Alignment 928
Menu l* = Events
Read out the tire pressure loss event memory
Important notes
From control unit version 02 on, the RDK control unit contains an event memory which stores data
on any pressure losses at one or more tires during the last 6 journeys made by the vehicle. It also in-
dicates the road speed at which the event occurred, and whether either one or two pressure-sensing
switches were open.
This event memory permits conclusions to be reached regarding unnatural pressure losses at one
or more wheels. Eliminate the cause of any unnatural pressure loss immediately.
Possible causes are stated on Page 44-26.
Of the 8 recorded journeys, journey 8 is the most recent.
When the event memory is read out the most recent journey, that is to say journey 8, is shown
on the system tester's display. The event memory cannot be erased.
If the > button is pressed, the next wheel for which a tire pressure loss event was recorded will be
displayed, or if no other wheel was affected during this journey, the previous journey appears on the
tester's display panel.
Event storage: when a new journey is started (after the ignition has been switched off), journey
No. 1 is erased from the event memory and the previous journey Nos. 8 to 2 moved up to be-
come journey Nos. 7 to 1.
* Additional RDK menu from control unit version R 02 on (introduced during the 1991 model year).
This would normally have the serial number Menu 4, but since the tester only has selector but-
tons 1, 2 and 3. the menu at the top of the display, in this case the event menu, starts again at
No. 1.
To change from one Menu 1 to the other (Event or Fault memory), page forward or back with the
Z- or -c keys.
44 - 312 RDK-Diagnose
Printed in Germany - xxv, 1990