Porsche 928 Workshop Manual page 57

03
Maintenance, Self-diagnosis 928
The first testing step is activated and the injec-
tion valves are actuated.
After testing step "speed signal from EZK to
LH control unit", additional controls must be
operated on the car to check the input signals.
Display:
The injection valves must all be heard or felt to
operate.
Note:
There may be starting difficulties in later at-
tempts to start the engine because a slight
residual amount of fuel is injected during this
testing step.
The testing steps remain in operation until the
green key is pressed again on the tester and
the clear symbol appears.
The next testing step is initiated by pressing
the green key again.
Refer to the test code list for the sequence of
testing steps.
Operate the starter motor for approx. 5
seconds. The LED on the tester will go out
shortly afterwards and the following display will
appear.
Display:
Note:
The ignition must not be switched off after the
starting procedure.
03 - 8
Functional check of actuator and input signals
Printed in Germany - XX, 1988
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