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6-2-4 WIRE HARNESS
The wire harness for the FI system connects key system components to the ECU.
The FI wire harness contains a temperature sensor that measures engine temperature, and
connects fuel injectors, ignition coils, electric fuel pump, pressure switch, and warning lamp.
The ECU uses this input to adjust to engine various conditions and monitors for failure diagnosis.
6-2-5 CHOKE SYSTEM
The throttle body monitors air pressure and engine temperature at start up and performs the
choke function automatically.
The choke system automatically adjusts for easier start of the engine in all weather conditions.
6-3 FUEL SYSTEM OUTLINE
6-4 FUEL SYSTEM TESTING AND DIAGNOSIS
Most fuel system malfunctions occur when the fuel/air ratio of the mixture is not correct.
This is usually caused by clogged fuel filters, air passages, fuel passages, or by variations in
the fuel level.
To get the best possible performance from the throttle body, make sure that the fuel feed and
air feed passages are free so air and fuel can flow freely through them.
The procedure for inspecting the fuel system is described below.
Run all system tests with a full tank of fresh, clean fuel.
Fuel Pressure Regulator
M.A.P. Sensor
Fuel Injector
ECU
Air
Cleaner
Magneto
Ignition
Unit
Ignition Pulse
Engine
Temperature
sensor
PULSATION
DAMPER
Fuel Tank
Throttle Body Assy
30kPa
(0.3kgf/cm
2
)
Return
TANK
FUEL RETURN PIPE
FILTER PIPE
FUEL
PUMP
FUEL
INJECTION
COMBUSION
PULSATION
DAMPER
Fuel
Pump
Fuel
Filter
Muffler
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