SeaDoo 2006 GTI, Руководство по ремонту

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Section 12 ELECTRICAL SYSTEM
Subsection 01 (IGNITION SYSTEM)
F07H0CA
1
1. Crankshaft position sensor (CPS)
Ignition Coil
Ignition coil induces voltage to a high level in sec-
ondary windings to produce a spark at spark plug.
717 Engines
The ignition coil steps up the voltage input from
the multi-purpose electronic module to high volt-
age current for both spark plugs.
The ignition coil is located in the rear electrical box
located under air intake.
787 RFI Engines
The digital inductive ignition system on the RFI
models allows the spark plugs to spark indepen-
dently on each piston stroke.
CAUTION: Do not interchange spark plug ca-
bles. Reversed spark plug cables will not allow
the RFI to run and will cause backfires.
MULTI-PURPOSE ELECTRONIC
MODULE (MPEM)
717 and 787 RFI Engines
The MPEM is responsible of the following electri-
cal functions related to the ignition system:
– ignition timing curve
– engine rev limiter.
For the other functions of the MPEM, refer to IN-
STRUMENTS AND ACCESSORIES section.
787 RFI Engines
The MPEM is also used with the Rotax fuel injec-
tion system.
The RFI model s use a digital inductive ignition sys-
tem. The Bosch ECU controls the ignition timing
and dwell time. It receives input from the CPS and
signals the ignition coil when to fire.
IGNITION TIMING
Before checking ignition timing with a stroboscop-
ic timing light (dynamic test), it is mandatory to
scribe a timing mark on the PTO flywheel (static
test) corresponding to the specific engine.
Also, the timing mark scribed on the PTO flywheel
can be used to troubleshoot a broken magneto
woodruff key.
CAUTION: The relation between the PTO fly-
wheel mark position and crankshaft position
may change as the PTO flywheel might move/
tighten/loosen on the crankshaft. As an exam-
ple on threaded flywheels, when the engine
is accelerated out of water, PTO flywheel may
tighten then loosen when the engine is decel-
erated. This will result in a false ignition timing
reading. Always verify PTO flywheel mark po-
sition before checking ignition timing with an
appropriate timing light. If mark does not align
with tool, repeat static test to ensure flywheel
has not loosen or moved before changing the
ignition timing.
NOTE: Do not use the factory mark found on the
PTO flywheel to check ignition timing or trou-
bleshoot any problems.
787 RFI Engines
Normally ignition timing adjustment should not be
required. It has been set at factory and it should
remain correctly adjusted since every part is fixed
and not adjustable. The only time the ignition tim-
ing might have to be changed would be when re-
placing the crankshaft, the magneto rotor the CPS
and the MPEM or the ECU. If the ignition timing is
found incorrect, you should first check for proper
crankshaft alignment. This might be the indication
of a twisted crankshaft.
RFI Models
The fixed timing mode must be activated before
checking ignition timing.
See FIXED TIMING
FUNCTION paragraph.
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