BOMBARDIER SEA-DOO GTX RFI 5666 1998, Manual

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Section 04 FUEL SYSTEM
Subsection 02 (FUEL INJECTION)
04-02-3
1. End cap of fuel pump assembly removed
2. Internal fuel filter
All these components are comprised in a single
module mounted in the fuel tank. The fuel gauge
sender is also mounted on this module.
FUEL PUMP ASSEMBLY
The injectors inject a metered quantity of fuel in
the cylinder rear transfer port in accordance with
the signal from the Electronic Control Unit (ECU).
INJECTOR
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:
1. Electronic fuel injection
The ECU receives the signals from 5 sensors
which indicate engine operating conditions at
milli-second 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.
2. 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 con-
trols the ignition timing for best engine operation.
3. Maximum engine speed
The ECU limits the maximum allowable engine
speed. The rev limiter is set at 7080 ± 50 RPM.
4. Fail-Safe Function
In the event of a sensor malfunction, the ECU will
use a default operating mode to ensure driveabili-
ty to shore. A message may be displayed on the
Info Center to inform the operator.
F07F0LA
2 1
F07F09A
F07F0AA
F07F0BA