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L510001-05
ELECTRONIC FUEL INJECTION INFORMATION - 4
ELECTRONIC FUEL INJECTION SYSTEM
The Crusader Marine Engines covered in this manual
are equipped with an Electronic Fuel Injection (EFI)
system, which allows precise control of fuel and spark
delivery. The fuel system components of the EFI system
are:
• The electric fuel pump
• The throttle body assembly
• The fuel injectors
The fuel injection system is controlled by an Electronic
Control Module (ECM). The ECM is the decision
center of the system. The ECM constantly monitors
information from various sensors on the engine, and
electronically processes the information, in order to
control ignition timing and fuel delivery for optimum
performance and fuel economy. The ECM incorporates
an engine overspeed protection, calibrated to a specifi c
RPM, to prevent engine damage from over-revving.
The sensors that the ECM monitors are:
• Engine Coolant Temperature (ECT) Sensor
• Throttle Position (TP) Sensor
• Manifold Absolute Pressure (MAP) Sensor
• Knock Sensor (KS) System
• Crankshaft Positioning (CKP) Sensor
• Camshaft Positioning (CMP) Sensor
• Intake Air Temperature (IAT) Sensor
If, for any reason, one or more of these sensors or
associated wiring malfunctions, the ECM’s built-in self-
diagnostic system sets a trouble code and turns on the
“Check Engine” light (if equipped) to alert the operator
of a malfunction.
In most cases, when the “Check Engine” light is on, the
engine(s) will lose some performance and/or effi ciency,
but remain running adequately. Also, the light may go
out or become intermittent, but a trouble code will be
logged for future diagnosis.
In any case, the operator must obtain service by an
authorized dealer to determine the exact cause of the
malfunction.
Figure 4-1 Check Engine Light Illuminated
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