Porsche 944 - Dangers on Electronic Ignition Systems; Work Requiring Ignition System Safety

944
gnition System
28
DANGERS ON ELECTRONIC IGNITION SYSTEMS
The
Type 944 is equipped with a digital engine electronic system (DME). In comparison to conventional
systems the
ignition power of DME is so high, that contact with current-carrying parts while engine is running
could be fatal. Consequently the ignition must always be turned off or battery ground wire disconnected when
doing
any work on ignition system.
Such
work would be:
1. Connecting engine testers.
2. Replacing
ignition system parts.
If DME testing or engine tuning requires turning on the ignition, the dangerous current mentioned above will
be in the DME ignition system.
Lightning bolts indicate the danger spots in the wiring diagram illustrated below.
1
2
3
Battery
Ignition lock
DME
control unit
Printed in Germany
5
4
5
6
4
Ignition coil
Distributor
Spark plug
0
0
©
3..?..::..; :.:.:.·..; ·..: :.:.:.·..: ·..::.:.:.·..; ·.:.1~\..
---------------- 1 0
3
0
Dangers on Electronic Ignition Systems
28 -3