SsangYong Korando III (2010 year). Service manual — part 119

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.

-

-

-

15-10

3) Injection Volume Control

(1) Overview

To keep the best engine conditions and to reduce the emission gas, ECU determines the injection

volume and timing.

(2) Components

Input Components

▶

Accelerator pedal

position sensor

Front oxygen

sensor

Coolant temperature

sensor

Crankshaft position

sensor

Camshaft position

sensor

Knock sensor

T-MAP sensor

Electronic throttle

body

Output Components

▶

15-11

0000-00

(3) Input/Output for Injection Volume Control

15-12

(4) Basic Injection Volume Map