Porsche 928 Workshop Manual page 557

28
Ignition System
928
TEST POINT 7
If switching points are not correct, make
tests direct on throttle switch.
Throttle Switch
1. Idle Speed Contact:
Turn off ignition and pull off multiple-
pin plugs on electronic ignition and LH
fuel injection control units.
1 .l Connect ohmmeter on electronic ignition
plug between terminals 4 and 12.
Throttle closed = 0 ohm
Throttle opened = inf. ohms
2 - Idle speed contact
18 -Ground
3 - Full load contact
Switching over must take place already with a
throttle gap of approx. lo.
2. Full Load Contact:
2.1 Connect ohmmeter on electronic ignition
plug between terminals 17 and 12.
Throttle closed
= inf. ohms
Throttle in full load pos. =
0 ohm
Switching point is after approx. 2/3 of
throttle travel.
Adjusting Throttle Switch
1. Unscrew mounting bolts on throttle
switch.
2. Turn switch counterclockwise until inner
stop is noticed (idle speed contact
closed). Throttle, however, must not also
be turned.
Full load contact is adjusted simultaneously
and cannot be adjusted separately.
28 - 60 Troubleshooting Electronic Ignition System
Printed in Germany
a