coolant SSANGYONG KORANDO 2013 Repair Manual

0000-00
Purge control
solenoid valve
G20DF engine
ECUCoolant Temp
sensorCamshaft position
sensor
Crankshaft position
sensor
T-MAP sensorVIS solenoid valveElectronic throttle
bodyMagnetic trigger
ring
Front oxygen
sensor

0000-00
Rear oxygen
sensor
2) Components for ECU Input
Coolant temperature
sensorCamshaft position
sensorCrankshaft position
sensor
Front oxygen sensor
Knock sensor
G20DF Engine ECUElectronic throttle
body
Refrigerant pressure sensor
Clutch pedal signal
Blower switch signal
Brake pedal signal
CAN
ABS & ESP
Instrument cluster
TCU -
-
-
Oil pressure
switchOil pressure warning lamp
T-MAP sensor

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 sensorFront oxygen
sensorCoolant temperature
sensorCrankshaft position
sensor
Camshaft position
sensorKnock sensorT-MAP sensorElectronic throttle
body
Output Components

0000-00
Coolant temperature
sensor
4) Ignition System Control
(1) Overview
G20DF engine is equipped with the single ignition system. Each spark plug is operated independently
by the ECU and one ignition coil and spark plug are provided for each cylinder.
(2) Components
Input Components
Crankshaft position
sensorAccelerator pedal position
sensor
Knock sensorCamshaft position
sensorElectronic
throttle body
Output Components

0000-00
(4) Features
Determines the ignition timing according to input signal
The ECU always analyzes the following elements when determining the ignition timing. 1.
Crankshaft position sensor
Camshaft position sensor
Coolant temperature sensor
Intake air temperature/air mass -
-
-
-
Warm-up of catalytic converter
The ignition timing is retarded for about 20 seconds to operate the catalytic converter according to the
operating temperature under the following conditions: 2.
The idle speed is increased by the idle speed control to help warming up of the catalytic converter -
-
Idle speed control
The ignition timing control can be performed faster than the control through the throttle valve.
Fuel cut-off in deceleration
The ignition timing is retarded temporarily to prevent abrupt increase of the torque when the
combustion is restarted.
Intake air temperature/coolant temperature
The ignition timing is retarded to prevent knocking if the intake air temperature or coolant temperature
is high. The ignition timing is retarded in the following cases. 3.
4.
5.
-
-
The ignition timing retard for intake air temperature and for coolant temperature is added up for
correction.
ESP/ASR control mode
The ignition timing is retarded to reduce engine torque as fast as possible under the ESP/ASR
control mode.
Knocking control
If knocking occurs in the cylinder, the ignition angle of the corresponding cylinder is retarded. The
6.
7.

5) Warm-Up of Catalytic Converter
(1) Components
Input Components
T-MAP sensorCoolant temperature
sensorCrankshaft position
sensor
Output Components

0000-00
(2) Warm-up Control Function
Low voltage
If low voltage is detected by the ECU, the idle speed increases up to 100 rpm selectively under the
driving mode until the ignition switch is turned off. Idle speed control
The idle speed is controlled according to the fuel/air mixture when the engine load is changed, the
power steering wheel is turned to its end, the selector lever is in the "D" position and the A/C compresso
r
is in operation. It is also controlled according to the charge level during the purge control operation.
Ignition timing
The idle speed is controlled according to the fuel/air mixture when the engine load is changed, The
Air conditioner compressor operation
The air conditioner control unit sends the air conditioner operation signal to the ECU to increase the
throttle valve opening amount in order to prevent reduction of the engine speed when the air conditioner
compressor is in operation at idling.
(3) Warm-up Control Operating Conditions
To make the catalytic converter reach a operating temperature, the ignition timing is retarded for about
20 seconds under the following conditions:
The selector lever is in the "P" or "N" position.
Also, the idle speed increases to 1100 ~ 1500 rpm simultaneously by the idle speed control. However, as
soon as the selector lever is shifted to the D position, warming up control of the catalytic converter will be
inhibited. The information necessary to perform such control is as follows:
Coolant temperature
Engine rpm
Intake air mass
Recognizing idling status
Selector lever position

6) Cooling Fan Control
(1) Overview of Cooling Fan and A/C Compressor
The cooling system maintains the engine temperature at an efficient level during all engine operating
conditions. The water pump draws the coolant from the radiator. The coolant then circulates through
water jackets in the engine block, the intake manifold, and the cylinder head. When the coolant reaches
the operating temperature of the thermostat, the thermostat opens. The coolant then goes back to the
radiator where it cools. The heat from automatic transaxle is also cooled down through the radiator by
circulating the oil through the oil pump. There are two cooling fans (180W+120W) in G20DF engine. ECU
controls the electric cooling fans with three cooling fan relays to improve the engine torque and air
conditioning performance.
(2) Components
Refrigerant pressure
sensorCoolant temperature
sensorG20DF Engine
ECURelay box in engine
compartment
A/C compressorCooling fan moduleT-MAP sensor

(4) Cooling Fan and A/C Compressor Control
Conditions for cooling fan
The cooling fan module controls the cooling fan relay, high speed relay and low speed relay.
The cooling fan is controlled by the series and parallel circuits
A/C
switchCooling
fanCoolant temperatureRefrigerant
pressureA/C
compressor
OFFOFF
-
LO
-
HI
-
ONLO
Refrigerant
pressure<18 bar
ON
HI
pressure
HI
-
HI
- OFF (cut)
A/C compressor OFF conditions
Approx. 4 seconds after starting the engine
When abrupt acceleration
Refrigerant pressure:
-
-
-
-
Output voltage according to refrigerant pressure
The output voltage from refrigerant pressure sensor is 1.7 V to 3.5 V when the refrigerant pressure is 10
Cooling fan control by ATF temperature
ATF temperature Cooling fan speed Remark
HI -

2. COOLANT FLOWS IN COOLING SYSTEM