SsangYong Korando III (2010 year). Manual - part 411

15-6

2. SYSTEM OPERATION

1) Input/Output of ECU

15-7

0000-00

Rear oxygen 

sensor

2) Components for ECU Input

Coolant temperature 

sensor

Camshaft position 

sensor

Crankshaft position 

sensor

Front oxygen sensor

Knock sensor

G20DF Engine ECU

Electronic throttle 

body

Refrigerant pressure sensor

Clutch pedal signal

Blower switch signal

Brake pedal signal

CAN

ABS & ESP

Instrument cluster

TCU

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Oil pressure 

switch

Oil pressure warning lamp

T-MAP sensor

15-8

A/C compressor

OCV (Oil Control Valve)

3) Components for ECU Output

Start motor

Injector

VIS solenoid valve

Purge control solenoid 

valve

G20DF Engine ECU

Ignition coil

CAN

ABS & ESP unit

BCM

E-coupling unit

EPS

Instrument cluster

SKM

TCU

Diagnostic tool

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Cooling fan 

module

15-9

1490-00

3. ECU CONTROL

1) Functions

ECU receives and analyzes signals from various sensors and then modifies those signals into 

permissible voltage levels and analyzes to control respective actuators.

ECU microprocessor calculates injection period and injection timing proper for engine piston speed and 

crankshaft angle based on input data and stored specific map to control the engine power and emission 

gas.

Output signal of the ECU microprocessor activates the injector solenoid valve to control the fuel injection 

period and injection timing; so controls various actuators in response to engine changes. 

Auxiliary function of ECU has adopted to reduce emission gas, improve fuel economy and enhance 

safety, comforts and conveniences. For example, there are autocruise and immobilizer and adopted 

CAN communication to exchange data among electrical systems (automatic T/M and brake system) in 

the vehicle fluently. And the diagnostic tool can be used to diagnose vehicle status and defectives.
Operating temperature range of ECU is normally -40 to +85°C and protected from factors like oil, 

water and electromagnetism and there should be no mechanical shocks.

2) Control Functions

Controls by operating stages:

To make optimum combustion under every operating stage, ECU should calculate proper injection 

volume in each stage by considering various factors.

Starting injection volume control:

During initial starting, injecting fuel volume will be calculated by function of temperature and engine 

cranking speed. Starting injection continues from when the ignition switch is turned to ignition 

position to till the engine reaches to allowable minimum speed.

Driving mode control:

If the vehicle runs normally, fuel injection volume will be calculated by accelerator pedal travel and 

engine rpm and the drive map will be used to match the drivers inputs with optimum engine power.

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