2.2.4 Fuel pump
Fuel is pumped to fuel hose by fuel pump and then supplied to fuel injector. Fuel pressure in
fuel pipe is maintained at 3.942±0.049Bar.
Testing Method
Listening：
Once ignition is turned to ON position and engine still off, fuel pump running sound can be
heard for 1 second and then stops. An operational pump can be determined by the sound
when starting engine. If fuel pump does not operate, check fuse, fuel pump relay, pump
voltage circuit and then fuel pump.
Air system
2.3.1 Throttle valve body
1 Idle step motor
2 Throttle position sensor
Throttle valve
Joint-connecting to water outlet elbow
Joint-throttle valve water outlet
Preheating water hose outlet pipe.
2.3.1.1 The throttle position sensor
The throttle position sensor is composed of a potentiometer，and the moving part is driven
by throttle shaft. During traveling, electric controller ECU supply voltage to sensor the
measured parameter is the variable generated by minimum throttle opening.
2.3.1.2 idle controller
This system utilizes step motor actuator. Because this actuator controls a comparatively
much air, the air valve could be cancelled, and can carry out idle control during warming
up.
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