Section 06 ENGINE MANAGEMENT (RFI)
Subsection 01 (OVERVIEW)
For mechanical inspection of the RAVE valves, re-
fertoTOPENDinthe717/787 RFI ENGINE SHOP
MANUAL. For RAVE valve solenoid testing, refer
to COMPONENT INSPECTION, REPLACEMENT
AND ADJUSTMENT in this manual.
OTHER ENGINE MANAGEMENT
FUNCTIONS
Limp Home Mode
Besides the signals as seen above, the ECM may
automatically use default parameters for the en-
gine management to ensure the adequate opera-
tion of the watercraft if a component of the fuel
injection system is not operating properly. Refer
to EMS Fault Code Table in DIAGNOSTIC PROCE-
DURES.
Depending on the severity of the malfunction, the
watercraft speed may be reduced and not allowed
to reach its usual top speed.
These performance-reduced modes allow the rid-
er to go back home which would not be possible
without this advanced system. Refer to the DIAG-
NOSTIC PROCEDURES for a complete chart.
If a fault occurs and involves a limp home mode
operation, the EMS system will reduce engine
RPM gradually to the proper level.
Monitoring System
The ECM permanently records and stores some
engine operation parameters.
The ECM monitors the electronic components of
the fuel injection system other electrical compo-
nents. When a fault occurs, it sends visual mes-
sages through the information center or indicator
light cluster and/or audible signals through a beep-
er to inform you of a particular condition. Refer to
the DIAGNOSTIC PROCEDURES subsection for
the displayed messages and the beeper coded sig-
nals chart.
ENGINE MANAGEMENT SYSTEM FLOW CHART
Fuel pump
Intake air
pressure
Crankshaft
Position Sensor
(CPS)
Crankshaft
position and
engine speed
Throttle valve
position (Idle to
wide open throttle)
Engine
temperature
Intake air
temperature
Air
Pressure Sensor
(APS)
Water
Temperature Sensor
(WTS)
Air
Temperature Sensor
(ATS)
Ignition
RAVE valve
solenoid
Injectors
INPUT
PARAMETERS
INPUT
SENSORS
OUTPUTS
Throttle
Position Sensor
(TPS)
ECM:
ENGINE
CONTROL
MODULE
VCM:
VEHICLE
CONTROL
MODULE
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