2013 SSANGYONG KORANDO Crankshaft

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.

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1. SPECIFICATION
Specification HPS EPS
Alternator Crankshaft pulley : Alternator Pulley 1 : 2.94
Normal output (idling/2200 rpm) 70/120 A 70/140A
Regulator voltage 14.6 V
Brush Length 12.5 mm
Wear limit 7 mm
Battery Type MF
Capacity 90AH

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Oil pressure
switch
Fuel rail
pres.sensor
Differential
pressure
sensor
Swirl valve posi.
sensor
Meter cluster
Coolant temp.
sensorE-EGR valve
posi. sensor
Oxygen
sensor
Exhaust gas
temp. sensor
HFM sensor
(2) Components for ECU Input
Crankshaft posi.
sensorAccel. pedal
posi. sensorThrottle
posi.sensor
Knock sensor
T-MAP sensor
Camshaft posi.
sensor
CAN
- ABS&ESP
- GCU
- Meter cluster
- TCU
- BCM
- Refrigerant pressure sensor
- Clutch pedal signal
- Blower switch signal
- Brake pedal signal

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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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HFM
Accelerator pedalCoolant
temperature
(4) Swirl control
a. Overview
Variable swirl valve -
The strong swirl caused by intake air is important element for anti-locking function in diesel engine. The
swirl control valve partially closes the intake port to generate the swirl according to the engine conditions.
When the engine load is in low or medium range, the swirl could not be generated because the air flow
is slow. To generate strong swirl, there are two passages in intake manifold, and one of them has the
valve to open and close the passage. When the valve closes the passage, the air flow through the
another passage will be faster, and the strong swirl will be generated by the internal structure of the
passage. This swirl makes the better mixture of air and fuel, eventually the combustion efficiency in
combustion chamber could be improved. This provides the enhanced fuel consumption, power and
EGR ratio.
Components -
D20DTF ECU
Crankshaft
position sensor
Variable swirl
valve

T-MAP sensor
D20DTF ECUOxygen sensor
Electronic
throttle bodyHFM sensor
(intake air temp.)
Coolant
temp.sensor
E-EGR valve
Crankshaft posi.
sensor
Accelerator
pedal
E-EGR cooler
(5) EGR control
a. Overview
The EGR (Electric-Exhaust Gas Recirculation) valve reduces the NOx emission level by recirculating
some of the exhaust gas to the intake system.
The major difference with the previous EURO 4 type, is that the DC motor with improved response rate
according to the EURO 5 regulation. The solenoid type actuator is used in the conventional model, but in
this new model, the DC motor type actuator with improved response rate is adopted. Also the hall senso
r
which provides a more stabilized signal than the potentiometer, and the EGR bypass flap which
improves engine warming up efficiency are also used. The HFM sensor and the position sensor are
used to feedback the amount of EGR for both EURO 4 and EURO 5.
b. Components

Accelerator
pedalE-VGT
actuator
Coolant
temperature
Front EGT
sensorT-MAP sensorCrankshaft pos,
sensor
HFM sensor
(intake air temp)
ECU
(D20DTF)
(6) E-VGT control
a. Overview
E-VGT (Electric-Variable Geometry Turbine) turbocharger system in D20DTF engine uses the venturi
effect that controls the flow rate of exhaust gas by adjusting the passage in turbine housing. The newly
adopted DC motor actuator (E-actuator) controls the E-VGT system more precisely and faster. To get
the high operating power from turbine, the ECU reduces the exhaust gas passage In low speed range
and increases it in high speed range.
b. Components

Engine mounting bracket
2. MAJOR COMPONENTS
Front View
Cylinder head front cover
Timing gear case cover
EPS idler pulley
Alternator
Water pump pulley
A/C compressor
Crankshaft pulley
Oil pan assembly
Rear View
Camshaft position sensor
Breather nipple
Purge control solenoid valveCoolant temperature sensor
Electronic throttle body
T-MAP sensor
MCC complete
VIS solenoid valve Cylinder head cover
Dual mass flywheel
Crankshaft position sensor
Hydraulic tensioner assembly