Sea-doo 2003 GTI LE RFI, Shop Manual

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Section 07 ENGINE MANAGEMENT (DI)
Subsection 02 (OVERVIEW)
SMR2003-023_07-02A.FM
07-02-5
The DESS circuitry in the watercraft MPEM is ac-
tivated at the factory. Therefore, a safety lanyard
must be programmed to start the engine.
NOTE: Actually, it is the memory of the MPEM
which is programmed to recognize the digital code
of the safety lanyard cap. This is achieved with the
MPEM programmer (P/N 529 035 878) or the VCK
(Vehicle Communication Kit) (P/N 529 035 844).
Refer to their operation manual or help system to
program a safety lanyard.
The system is quite flexible. Up to 8 safety lan-
yards may be programmed in the memory of the
watercraft MPEM. They can also be erased indi-
vidually.
The MPEM also offers a special safety lanyard — the
Sea-Doo LK™ (learning key) — which can be pro-
grammed so that the vehicle can be run only at a
limited speed — approximately 48 km/h (30 MPH).
Such feature is ideal for first time riders or renters.
NOTE: If desired, a safety lanyard can be used on
other watercraft equipped with the DESS. It only
needs to be programmed for that watercraft.
When connecting a safety lanyard cap on the post,
the DESS is activated and will emit audible signals:
– 2 short beeps indicate a working safety lanyard.
Engine starting can take place.
– 1 long beep indicates a wrong safety lanyard is
being used or that something is defective. En-
gine starting is not allowed.
The MPEM features a self-diagnostic mode. Refer
to DIAGNOSTIC PROCEDURES subsection for
more information.
The memory of the MPEM is permanent. If the
battery is disconnected, no information is lost.
When ordering a new MPEM from the regular
parts channel, the DESS circuitry will be activated.
Gauges Current Supply
When installing the safety lanyard it activates the
reading of gauges without the engine running. It
will give access to most functions of the informa-
tion center gauge without starting the engine.
NOTE: The fuel pump will be activated for 2 sec-
onds to build up pressure in the fuel injection sys-
tem, only when connecting the safety lanyard cap
to the post.
Engine Starting
If the MPEM recognizes a valid safety lanyard, it
allows engine to start when the start/stop button
is pressed.
If start/stop button is held after engine has started,
the MPEM automatically stops the starter when
the engine speed reaches 1000 RPM.
If start button is activated while the throttle lever
is depressed more than 70%, the engine will not
be allowed to start.
Engine RPM Limiter
The MPEM will limit the maximum engine speed.
Engine Stopping
There are 2 ways to stop the engine.
Press start/stop button or remove the safety lan-
yard cap from its post.
Low-Fuel and Low-Oil Level Warning Device
When the fuel level in the reservoir is low, the fuel
level sensor transmits a signal to the MPEM. The
MPEM sends out signals to the beeper and to the
information center gauge.
When the oil level is low in the reservoir, the
MPEM sends out a signal to the information center
gauge and the pilot lamp on the gauge will turn on.
Power Distribution
A power supply cut-off relay isolates the battery
from the electrical system to prevent battery
drain. When the safety lanyard is installed, the re-
lay then supplies current to the MPEM.
The relay is located in electrical box cover.
The MPEM distributes power from battery to all
accessories (except bilge pump which is connect-
ed to battery power on
XP DI models ). Accesso-
ries are protected by fuses integrated in the
MPEM, in fuse holder(s) close to MPEM or in the
electrical box. Fuses are identified besides their
holder.
IMPORTANT: The sensors and injectors are con-
tinuously powered with the supply from the bat-
tery.
The MPEM switches the ground to com-
plete the electrical circuits it controls. Take this
into account when troubleshooting the electrical
system.

WARNING
When programming a Sea-Doo LK™ (learning
key), use only a lanyard that is identified for
that purpose. Otherwise, a customer could use
a vehicle with a greater speed than he was ex-
pecting.
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