2013 SSANGYONG KORANDO turn signal

ENGINE CONTROL
SYSTEM
Engine ECU (D20DTF)
1. OVERVIEW
The components in the fuel system supply fuel and generate high pressure to inject fuel to each injector.
They are controlled by the engine ECU.
The common rail fuel injection system consists of fuel tank, fuel line, low pressure line which supplies lo
w
pressure fuel to the low pressure pump (includes high pressure pump), high pressure line which
connected to the injector and the engine control unit (ECU) which calculates the accelerator pedal
position and controls the overall performance of vehicle based on the input signals from various sensors.
HP fuel pump
Common rail and
Injector Fuel filter
(Priming pump)
Fuel supply tube
Fuel return tube
Fuel tank Fuel neck
Fuel sender (main)
Fuel sender (sub)
Low pressure line
High pressure line

Fuel rail assembly
Relieves the pulsation.
Measures the fuel pressure.
Distributes the fuel to injectors.Camshaft position sensor
Determines the injection order.
Injector (C3I)
Pre-injection, main injection, after-injection by
signals from ECU
Fuel tank
Fuel metering by dual sender. Supply the fuel in
main fuel tank and sub fuel tank through fuel
inlet tube
2. SYSTEM LAYOUT AND OPERATION
1) Layout
Fuel supply line
Fuel return line
For sensor and actuator control logic,
refer to Chapter "ENGINE CONTROL".

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.

1719-02 Swirl control valve
Operates variably in accordance with the engine
load and rpm.
* For more information, refer to Chapter "Engine
Control".
1719-01 Intake manifold
Passage for intake air during the operation of
variable swirl valve
1719-16 Electric throttle body
* For more information, refer to Chapter "Engine
Control".
1. OVERVIEW
The intake system for D20DTF engine is equipped with an electric throttle body which includes a flap.
This flap is controlled by an electrical signal to cut off the intake air entering to the engine when the
ignition switch is turned off. To be sure to get the optimized swirl in intake manifold, the swirl valve and
dual type port have been adopted. And, the improved HFM sensor has been adopted to control the
intake air volume more precisely.
2. COMPONENTS
2330-01 Intercooler assembly

When there is no engine cranking signal after turning the ignition key ON

2. OPERATING PROCESS
1) System Layout
(1) Engine start
SKM performs the authentication process for the SMART key and sends the engine start request to
EMS if there is a normally coded SMART key when pressing the Engine Start/Stop button with the
SKM sends the start request signal to PCAN network and the cranking request to BCAN network by
button.
SKM turns off the IGN2/ACC relay during cranking to shut down the electric loads.
SKM receives the starting status signal from EMS throug PCAN.
EMS starts to crank the engine after checking the pre-heating condition if it receives the engine
cranking request 1 when pressing the Engine Start/Stop button. EMS starts to crank the engine
immediately if it receives the engine cranking request 2 when pressing the Engine Start/Stop button. 1.
2.
3.
4.
5.
6.
Engine cranking request 1: when pressing the Engine Start/Stop button shortly in normal
conditions
Engine cranking request 2: when pressing the Engine Start/Stop button again after first press or
when pressing the Engine Start/Stp button for more than 3 seconds -
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Engine start during driving 7.
When pressing the Engine Start/Stop button with IGN ON, the engine start is requested if the
the brake switch is ON (no need authentication for 30 seconds).
When pressing the Engine Start/Stop button with IGN ON, the engine start is requested
position (no need authentication for 30 seconds).
Except input of brake switch signal
In vehicle equipped with A/T, when pressing the Engine Start/Stop button for more than 10
seconds with ACC ON, the engine start is requested regardless of brake signal if the gear shift
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8530-00
Abnormal changes of the gear selector lever can damage the yyengine. Do not move the gear shift
lever to Neutral while driving at the set speed. Automatic transaxle damage may result.
The speed that has been set may not be maintained on uphill or yydownhill slopes.
The speed may drop to less than the set speed on a steep uphill yygrade. The accelerator must be
used if you want to maintain that speed.
The speed may increase to more than the set speed on a steep yydownhill grade. When the speed
increases too much, turn off the cruise control. 1.
2.
3.
4.
(1) Abnormal Cancellation of the Cruise Control
When the rapid deceleration is applied without braking.
When the rapid acceleration is applied without acceleration pedal intervention (DSL only).
When the cruise control lever is failed (DSL only).
When the brake switch and the brake light switch input signal are implausible. 1.
2.
3.
4.
And the cruise control system cannot be operated again in driving state. In this case, you should stop the
vehicle, and turn off the ignition switch and then turn it on again. After you do that, you can use the cruise
Ssangyong Dealer for diagnosis of the cruise control system.
(2) Using the Cruise Control on Hills
How well the cruise control works on hills depends on the speed, load, and the steepness of the hill.
When going up steep hills, you may have to depress the accelerator pedal to maintain your speed.
When going downhill, you may have to brake or shift to a lower gear to keep your speed down.
Applying the brake takes you out of the cruise control.

0000-00
2) ECU Control
(1) Function
a. ECU Function
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 drives pressure control valve to control the rail pressure and
activates 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 EGR, booster pressure control, autocruise (export only) and immobilizer and adopted CAN
communication to exchange data among electrical systems (automatic T/M and brake system) in the
vehicle fluently. And Scanner can be used to diagnose vehicle status and defectives.
water and electromagnetism and there should be no mechanical shocks.
To control the fuel volume precisely under repeated injections, high current should be applied instantly
so there is injector drive circuit in the ECU to generate necessary current during injector drive stages.
Current control circuit divides current applying time (injection time) into full-in-current-phase and hold-
current-phase and then the injectors should work very correctly under every working condition.
b. Control Function
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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