Rotax 912 i Series Maintenance Manual page 279

SYSTEM DESCRIPTION
The ignition voltage is distributed directly to the
cylinders by stationary, electronically controlled
components.
The ignition voltage is generated by four double
ignition coils which are situated above the spark
plugs. The ignition unit is synchronised by the
signals of the position sensors (see section 76-
70-00 Sensors and actuators) of the crankshaft,
which are sent to the control unit (ECU) (see 76-
10-00 Control unit (ECU)). To determine the
optimal ignition point, the ECU uses its saved
ignition map to adapt to the different operating
states, taking into account the signals of the
knock sensor.
INTERNAL GENERATORS
See also section 24-20-00 Internal generator.
DOUBLE IGNITION COILS
The four double ignition coils are fastened to the
intake manifolds.
The connections are labelled according
NOTE:
to the closest cylinder designation.
IGNITION CABLE ASSY.
The high voltage ignition cable consist of copper
alloys for applications at high ignition temperatu-
res.
Protection hose identification
The protection hoses of the ignition cables are
labelled with a number/letter combination on the
resistance spark plug connector side (1 T, 1 B,
2 T, 2 B, 3 T, 3 B, 4 T, 4B).
The label marks the position of the ignition cable
on the ignition coil.
1, 2, 3 and 4 = cylinder
T, B = Top, Bottom
e.g.: 3 T = ignition coil for cyl. 3 at the top con-
nector.
The cables are only available as comple-
NOTE:
te parts (ignition cable, protection hose,
ignition coil side connector).
Effectivity: 912 i Series
Edition 1/Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
SPARK PLUGS
The spark plugs are not shielded but use a resis-
tance type suppressor to prevent interference.
The connecting bolt for the high-voltage ignition
cables complies with ISO/DIN standard guideli-
nes.
WIRING HARNESS
All the components necessary for the engine are
connected to the wiring harness. See also sec-
tion 76-00-00 Engine management.
FUSE BOX
The fuse box contains the capacitors and all the
fuses. See also section 76-00-00 Engine
management.
SAFETY INFORMATION
WARNUNG WARNING
Danger of electric shock! Switch off the ignition
and pull out the ignition key!
WARNUNG WARNING
Danger of death due to high voltage!
Only carry out work on the ignition unit with the
appropriate protective measures and devices!
WARNUNG WARNING
Follow the general safety instructions during all
work on the engine and the assemblies around
it. See section Introduction.
See also section 70-00-00 Standard work on the
engine.
CONNECTIONS FOR DISPLAY SYSTEMS
WARNUNG
Follow the instructions in the installation manual
regarding connections for instrumentation.
NOTICE
74-20-00
Page 7
July 01/2012