Porsche 928 Workshop Manual page 481

928 starter, Power Supply. Tempostat
27
CHECKING VACUUM SERVO
1. Bridge term. 3 and term. 5 on multiple pin plug of
removed control.
2. Connect any push button switch on terminals 7
and 12.
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The length of the wires for the push button switch
should be about 2 meters, in order to be able to
watch the throttle while operating the switch.
3. Turn on ignition and press push button switch with
engine stopped. The vacwm servo should move the
throttle uniformly to full load position.
This requires vacuum.
Note
To avoid damaging the female plugs in the multiple pin
plug. suitable plugs or the wires described below must
be used.
Remove insulation on wires with an insulating
diameter of approx. 2 mm, bend back separate wires
all around and wrap insulating tape around ends of
wires.
Printed in Germany Vi, 1982
Troubleshooting Automatic Cruise Control (Tempostat)
27.11