Club Car EX40D, Руководство по обслуживанию, ремонту и восстановлению, Страница: 46 / 64

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9-1 FUNCTIONS AND CONSTRUCTION
9-1-1 FUEL INJECTOR
Fuel is metered by the fuel injector that is actuated electronically by ECU .
The fuel is injected into the throttle bore and mixed with air from the air cleaner .
9-1-2 ENGINE CONTROL UNIT (ECU)
The ECU (engine control unit) on bottom of the throttle body is powered by DC battery . The ECU
monitors engine conditions such as engine speed, air pressure, and engine temperature .
With these inputs, the ECU actuates the fuel injector to ensure the fuel/air mixture is of optimum
concentration and is fed into the combustion chamber of the engine at the correct timing . When engine
speed reached to 4,400 rpm, the ECU cuts fuel to prevent over speed .
The ECU also controls the low oil sensor system and monitors voltage of DC battery, and each wiring
whether disconnecting or electrical short circuit .
9-1-3 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 .
9-2 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 .