2013 SSANGYONG NEW ACTYON SPORTS Service Manual

02-4
Temperature VS Resistance ▶

02-52211-06
1. FUEL SYSTEM
The function of the fuel metering system is to deliver the correct amount of fuel to the engine under all
operating conditions.
The fuel is delivered to the engine by the individual fuel injectors mounted into the intake manifold nea
r
each cylinder.
The main fuel control sensors are the Mass Air Flow (MAF) sensor and the oxygen (O2) sensors.
The MAF sensor monitors the mass flow of the air being drawn into the engine. An electrically heated
element is mounted in the intake air stream, where it is cooled by the flow of incoming air. Engine Control
Module (ECM) modulates the flow of heating current to maintain the temperature differential between the
heated film and the intake air at a constant level. The amount of heating current required to maintain the
temperature thus provides an index for the mass air flow. This
concept automatically compensates for variations in air density, as this is one of the factors that
determines the amount of warmth that the surrounding air absorbs from the heated element. MAF
sensor is located between the air filter and the throttle valve.
Under high fuel demands, the MAF sensor reads a high mass flow condition, such as wide open throttle.
The ECM uses this information to enrich the mixture, thus increasing the fuel injector on-time, to provide
the correct amount of fuel. When decelerating, the mass flow decreases. This mass flow change is
sensed by the MAF sensor and read by the ECM, which then decreases the fuel injector on-time due to
the low fuel demand conditions.
The O2 sensors are located in the exhaust pipe before catalytic converter. The O2 sensors indicate to
the ECM the amount of oxygen in the exhaust gas, and the ECM changes the air/fuel ratio to the engine
by controlling the fuel injectors. The best air/fuel ratio to minimize exhaust emissions is 14.7 to 1, which
allows the catalytic converter to operate most efficiently. Because
of the constant measuring and adjusting of the air/fuel ratio, the fuel injection system is called a "closed
loop" system.
The ECM uses voltage inputs from several sensors to determine how much fuel to provide to the engine.
The fuel is delivered under one of several conditions, called "modes".

02-6
1) Starting Mode
When the ignition is turned ON, the ECM turns the fuel pump relay on for 1 second. The fuel pump then
builds fuel pressure. The ECM also checks the Engine Coolant Temperature (ECT) sensor and the
Throttle Position (TP) sensor and determines the proper air/fuel ratio for starting the engine. This ranges
from1.5 to 1 at -36 °C (-33 °F) coolant temperature to 14.7 to 1 at 94 °C (201 °F) coolant
temperature. The ECM controls the amountof fuel delivered in the starting mode by changing how long
the fuel injector is turned on and off. This is done by ''pulsing" the fuel injectors for very short times.
2) Run Mode
The run mode has two conditions called ''open loop" and ''closed loop".
3) Open Loop
When the engine is first started and it is above 690 rpm, the system goes into "open loop" operation. In
"open loop", the ECM ignores the signal from the HO2S and calculates the air/fuel ratio based on inputs
from the ECT sensor and the MAF sensor. The ECM stays in "open loop" until the following conditions
are met:
The O2 has a varying voltage output, showing that it is hot enough to operate properly.
The ECT sensor is above a specified temperature (22.5 °C).
A specific amount of time has elapsed after starting the engine. -
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4) Closed Loop
The specific values for the above conditions vary with different engines and are stored in the
Electronically Erasable Programmable Read-Only Memory (EEPROM).
When these conditions are met, the system goes into "closed loop" operation. In "closed loop", the ECM
calculates the air/fuel ratio (fuel injector on- time) based on the signals from the O2 sensors. This allows
the air/fuel ratio to stay very close to 14.7 to 1.
5) Acceleration Mode
The ECM responds to rapid changes in throttle position and airflow and provides extra fuel.
6) Deceleration Mode
The ECM responds to changes in throttle position and airflow and reduces the amount of fuel. When
deceleration is very fast, the ECM can cut off fuel completely for short periods of time.

02-72211-06
7) Battery Voltage Correction Mode
When battery voltage is low, the ECM can compensate for a weak spark delivered by the ignition
module by using the following methods:
Increasing the fuel injector pulse width.
Increasing the idle speed rpm.
Increasing the ignition dwell time. -
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8) Fuel Cut-Off Mode
No fuel is delivered by the fuel injectors when the ignition is off. This prevents dieseling or engine runon.
Also, the fuel is not delivered if there are no reference pulses received from the CKP sensor. This
prevents flooding.

03-31713-08
1. SPECIFICATIONS
(1) Fastener Tightening Specifications

04-32420-01
1. SPECIFICATION
(1) Fastener Tightening Specifications

04-4
1. DESCRIPTION AND OPERATION
1) Exhaust System
When you are inspecting or replacing exhaust system components, make sure there is adequate
clearance from all points on the underbody to avoid possible
overheating of the floor panel and possible damage to the passenger compartment insulation and trim
materials.
Check the complete exhaust system and the nearby body areas and trunk lid for broken, damaged,
missing or mispositioned parts, open seams, holes, loose connections, or other deterioration which
could permit exhaust fumes to seep into the trunk may be an indication of a problem in one of these
areas. Any defects should be corrected immediately.
2) Catalytic Converter (Gasoline Engine)
When jacking or lifting the vehicle from the body side rails, be certain that the lift pads do not contact
the catalytic converter, as this could damage the catalytic converter.
Use of anything other than unleaded fuel will damage the catalyst in the catalytic converter. 1.
2.
Catalytic Converter Structure ▶
The Catalytic converter of monolith type consists of 2
walled metal bodies which is made of Cordierite. The
principal element of converter consists of the materials
like Alumina or oxidized Serume in order to apply to
Ceramic Monolith. Washer coat operates first, and
catalytic metal elements (Pt, Pd, Rh) operates to
washer coat next.
Monolith type is lighter than other types, easy to
manufacture and quickly approaches to prope
r
temperature. Washer coat is used to make a contact
surface with exhaust gas bigger by adhering closely to
small holes
of inner layer. If a lead compound or phosphorus
adheres to the surface and the temperature rises, its
surface is decreased. The total area of general
monolith converter is about 45, 000~500,000ft3. (10
times of a football field) Generally Alumina (AL2 O3) is
used as a raw materialand its 7 phases of gamma,
delta, theta have big areas and high stability for the
temperature, and nowadays gamma Alumina is used
usually.

04-52420-01
Catalytic Converter and Temperature ▶
Catalytic converter has the normal function of
purification at a range of the temperature.
Because it has a weak point of decreasing of the
purification rate in the condition of continuous
high temperature, it should keep the temperature
range of 400 to 500°C for normal condition.
HC purification rate becomes better according to
the increase of temperature in the normal range
of temperature. CO purification rate becomes the
best near the temperature of 450°C, and NOx
does so near the temperature of 400 to 500°C.
Purification of Catalytic Converter ▶
Adhesion of soluble organic fraction (SOF)
below 180°C
Purification of soluble organic fraction (SOF)
over 180°C
Chemical reaction formula -
-
SOF(HC)+O2 → CO2+H2O
2CO+O2 → 2CO2
2C2H6+7O2 → 4CO2+6H20
By catalytic action of two primary catalytic
converter, oxidation occurs in order to
decrease HC and CO. -
Oxygen adheres to catalytic
material : below 180°CCatalytic material supplies each
CO and HC with O2 for their
oxidation : above 180°CCatalytic material conversion
process by DOC