SsangYong Korando III (2010 year). Manual — part 334

03-28

2) Fuel System Flow Diagram

The fuel from the fuel tank is supplied to the fuel heater of fuel filter/priming pump and then low pressure

generated by the low pressure pump (built into HP pump) is transmitted to the HP pump.

The fuel pressure at the HP pump is controlled by the IMV valve, and the maximum allowed pressure is

1,800 bar. The compressed fuel at the fuel pump is delivered to the rail, and injected by the injectors

according to the injection signals. The injection method is the same with the conventional method; Fuel

return by backleak which operates the needle valve.

The major difference is that the fuel return line is connected to the fuel filter inlet port, not the HP pump

venturi.

The pressure from the high pressure pump is increased to 1,800 bar from 1,600 bar, and the pump is now

installed to the cylinder head (cylinder block for previous model). The fuel pressure is generated by the

operation of intake camshaft and gears. The specifications for the IMV valve and the fuel temperature

sensor are not changed.

03-29

0000-00

3) Input/Output devices

03-30

The engine ECU calculates the accelerator pedal based on the input signals from various sensors, and

controls the overall operation of the vehicle.

The ECU receives the signals from various sensor through data line, and performs effective air-fuel ratio

control based on these signals.

The crankshaft speed (position) sensor measures the engine speed, and the camshaft speed (position)

sensor determines the order of injections, and the ECU detects the amount of the accelerator pedal

depressed (driver's will) by receiving the electrical signals from the accelerator pedal sensor.

The mass air flow sensor detects the volume of intake air and sends the value to the ECU.

The major function of the ECU is controlling air-fuel ratio to reduce the emission level (EGR valve control)

by detecting instantaneous air flow change with the signals from the mass air flow sensor.

Also, the ECU uses the signals from the coolant temperature & air temperature sensors, booster pressure

sensor, atmospheric pressure sensor to: a) determine injection starting point and set value for pilot

injection, and b) deal with various operations and variable conditions.

03-31

0000-00

4) Flow Diagram of Fuel Supply System