Porsche 928 Workshop Manual page 480

27
starter, Power Supply. Tempostat 928
a
TROUBLESHOOTING AUTOMATIC CRUISE CONTROL
(TEMPOSTAT)
First check the following points when the automatic
cruise control malfunctions.
1. Check fuse no. 10 (no. 7 beginning with 1981
models).
This fuse is also for the stop lights.
2. Connect manual vacuum pump on vacuum system
and check for leaks.
3. Visually inspect ~acwm hoses for bends or
twisting.
4. Check that electric connection on vacuum servo
fits tight.
5. Check function of microswitch on clutch pedal.
Switch must have switched fully. i.e. contact
made, when clutch pedal is in off position
(switching heard when operating clutch).
If no defect is found while checking all of these
points, remove the control and continue trouble-
shooting on the multiple pin plug.
27.10
Troubleshooting Automatic Cruise Control (Tempostat) Printed in Gemmy