Multi-Purpose Electronic Module (Mpem) - Sea-doo RX Shop Manual

Section 09 ELECTRICAL SYSTEM
Subsection 02 (IGNITION SYSTEM)
Ignition Coil
Ignition coil induces voltage to a high level in sec-
ondary windings to produce a spark at spark plug.
Two separate ignition coils receive input from the
MPEM. Each coil will provide high voltage to its
corresponding spark plug.
This ignition system allows spark plugs to spark
independently.
CAUTION: Do not interchange spark plug cables.
Both coils are located inside the electrical box.
1. Ignition coil PTO
2. Ignition coil MAG
3. Starter cable
4. Positive battery cable
5. Solenoid
6. Fuse
MULTI-PURPOSE ELECTRONIC
MODULE (MPEM)
The MPEM is directly powered by the battery. It
has a micro-processor inside of its sealed case.
The MPEM is responsible of the following electri-
cal functions:
– interpreting information
– distributing information
– start/stop function
– timer
– Digitally Encoded Security System
– ignition timing curve
– engine rev limiter.
09-02-2
Some fuses are directly mounted onto the MPEM.
All the electrical system is controlled by the MPEM.
It has internal micro-processor and is directly pow-
ered by the battery.
The MPEM features a permanent memory that
will keep the programmed safety lanyard(s) active
and other vehicle information, even when the bat-
tery is removed from the watercraft.
MPEM Functions
Automatic Power Shut-Down
The MPEM is equipped with an automatic power
shut-down. This feature prevents the battery from
loosing its charge if the safety lanyard cap is left
on the switch when the engine is not running.
After connecting the safety lanyard cap, the
MPEM will remain in standby mode during the
next 10 minutes, waiting for a starting. If start/
stop button is not depressed, then the MPEM will
be automatically powered down.
Antistart Feature
When connecting a safety lanyard cap on the
switch the DESS system inside the MPEM is ac-
tivated and will emit audible signals:
– 2 short beeps indicate a right safety lanyard is
being used and gauges are supplied with cur-
rent for 33 seconds. The MPEM will thus allow
the engines to start.
– 1 long beep indicates a wrong safety lanyard is
being used or that the antistart feature is defec-
tive. Current to gauges is cut after the audible
signal is emitted and the engines cannot be
started.
A wrong safety lanyard is a safety lanyard which
is defective or not programmed in the MPEM
memory.
To better understand the antistart feature, refer to
DESS (DIGITALLY ENCODED SECURITY SYS-
TEM).
If the MPEM responds differently from what is
mentioned above, refer to the troubleshooting
section to find out why.
Gauges Current Supply
The purpose of this function is to allow reading of
gauges without the engine running. It will give ac-
cess to all the functions of the info center gauge
(if equiped) without starting the engine.
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