Porsche 928 Workshop Manual page 600

928 S4
928 GT
Fuel System, Electronic Injection
24
c) Injection output stage
Adjust the oscilloscope in accordance with the
manufacturer's instructions. Connect a Bosch
test lead (1 684 463 093) between one injec-
tion valve and plug. Connect the tester lead to
the test lead in accordance with the manufac-
turer's instructions.
Important:
Tester leads must not have any contact with
ground.
Start the engine. If the injection output stage is
working correctly and the tester connections
are correct, the following displays
must
appear:
Starter speed
If the engine does not start or if idle speed
drops, interchange the tester connections at
the test lead and check the tester setting.
LH-Diagnosis/Troubleshooting
Prlnted In Germany - XXV, 1990
D 24 - 23