Electronic Fuel Injection System

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 pumps • 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 • Throttle Control Position (TCP) Sensor If, for any reason, one or more of these sensors or associated wiring malfunctions, the ECM’s built-in selfdiagnostic system sets a trouble code and turns on the “MIL” Malfunction Indicator Lamp or “Check Engine” lamp (if equipped) to alert the operator of a malfunction. In most cases, when the “Check Engine” light is on, the engine(s) may 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 Crusader Premier dealer to determine the exact cause of the malfunction.