Porsche 911 TURBO - 1989 Workshop Manual page 172

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Ignition
System
yes
7. For ignition failure:
Disconnect tachometer.
If ignition failure is gone, the tachometer
has a defect. If not, the tachometer is good.
Ignition failure eliminated?
I
no
I
-Replace
control unit
yes
Engine must start or there must be engine
output. If not, there is a mechanical defect.
8. Disconnect wire plugs at air flow sensor
contact or bridge terminals 30 and 87 on base
of relay for fuel pump II.
28
-9
Troubleshooting Electronic Ignition System
Printed
in Germany
-II,
1976

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