Porsche 928 - WORKSHOP MANUAL 1977 Workshop Manual page 134

928 Wheels. Tires. Alicmment
44
RDK - possible fault displays and their causes
Possible RDK fault displays
Tire pressure at each wheel is monitored by two pressure sensing switches installed in the wheel. If
the tire oressure droos below the nominal value to which the oressure sensina switch is set, or if a
fault develops. a warning appears on the instrument panel: the warning light at the top right
comes on and the corresponding fault display is shown in the display panels.
Possible fault display
A
/ color
I
!-US5
~17
red
l
B
C
I
TIRE
1
[PFaESSklRE orange
i3Qf{TROL OFF
red
When the ignition is turned on, the warning light comes on as a bulb test. It goes out when the en-
gine is started. Tire pressure monitoring starts after the car has been driven for approx. 20 m and
when a minimum speed of 5 kph has been reached.
Display A: Arrow indicates wheel with low tire pressure (cause in wheel area).
Display B: Appears for approx. 2 minutes after switching off the ignition as a reminder.
Display C: RDK system fault has occurred. Tire pressures are no longer being monitored (cause in
system).
If a system fault has occurred, &&x.use is stored in the fault memory of the RDK control unit and
can be called
UD
bv means of the diaanostic facilitv (from Paae 44 3011.
The fault display (RDK system fault and pressure warning) can be acknowledged with the in-car com-
puter control lever, after which the text display will disappear. However, displays re-appear peri-
odically until the fault is eliminated.
RDK - possible fault displays and their causes
Printed in Germany xM1,1990
44 - 25