Section 06
ENGINE MANAGEMENT (RFI)
Subsection 02
(OVERVIEW)
06-02-4
SMR2003-022_06_02A.FM
ELECTRONIC MANAGEMENT
ELECTRONIC CONTROL UNIT
(ECU)
The electronic fuel injection is equipped with a
Bosch Electronic Control Unit (ECU).
ELECTRONIC CONTROL UNIT (ECU)
The ECU is mounted behind the MPEM in the
front of the watercraft, in a watertight box.
The ECU controls the following functions:
Basic Operating Function
Electronic Fuel Injection
The ECU receives the signals from 5 sensors which
indicate engine operating conditions at millisecond
intervals.
– Throttle Position Sensor (TPS)
– Crankshaft Position Sensor (CPS)
– Air Temperature Sensor (ATS)
– Water Temperature Sensor (WTS)
– Air Pressure Sensor (APS).
These signals are used by the ECU to determine
the injection duration required for optimum air-fuel
ratio.
Ignition Timing
The ECU is programmed with data for optimum
ignition timing under all operating conditions. Us-
ing data provided by the sensors, the ECU controls
the ignition timing for optimum engine operation.
Maximum Engine Speed
The ECU limits the maximum allowable engine
speed. The RPM rev limiter is set at 7200 ± 50
RPM.
Fail-Safe Function
In the event of a sensor malfunction, the ECU will
use a default operating mode to ensure driveability
to shore. A message may be displayed on the Info
Center to inform the operator.
Diagnostic Mode
The ECU is able to detect malfunctions in the sen-
sor network. The malfunction is recorded in the
memory of the ECU. The memory of the ECU can
be checked using VCK (Vehicle Communication
Kit) (P/N 529 035 844) or MPEM programmer tool.
MPEM
(Multi-Purpose Electronic Module)
The MPEM is also used with the Rotax Fuel Injec-
tion system.
MPEM
It is responsible of the following electrical func-
tions:
– interpreting information
– distributing information
– start/stop function
– timer
– vehicle hours
– Digitally Encoded Security System (DESS).
The MPEM has a special safety feature to limit
engine revolutions when the battery voltage is too
low.
For example, when the battery voltage reaches
8.9 volts for at least 30 seconds, engine revolu-
tions are limited to 4480 RPM.
When voltage reaches 7 volts for at least 30 seconds,
the engine is automatically shut off by the MPEM.
F07F0BA
F07H0BA
www.SeaDooManuals.net
Summary of Contents for 2003 GTI LE RFI
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Page 769: ...F00Z0D 2003 GTI MODEL WARNING www SeaDooManuals net ...
Page 770: ...F00Z0C 2003 GTI LE MODEL WARNING www SeaDooManuals net ...
Page 771: ...F00Z0E 2003 GTI LE RFI MODEL WARNING www SeaDooManuals net ...
Page 772: ...F00Z0J 2003 RX DI MODEL WARNING www SeaDooManuals net ...
Page 773: ...F00Z0I 2003 GTX DI MODEL WARNING www SeaDooManuals net ...
Page 774: ...F00Z0K 2003 XP DI MODEL WARNING www SeaDooManuals net ...
Page 775: ...F00Z0F 2003 GTX 4 TEC MODEL WARNING www SeaDooManuals net ...
Page 776: ...F00Z0G 2003 GTX 4 TEC MODEL WITH AUXILIARY DESS MODULE WARNING www SeaDooManuals net ...
Page 777: ...F00Z0B 2003 GTX 4 TEC AND GTX 4 TEC SUPERCHARGED MODELS WARNING www SeaDooManuals net ...
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