SsangYong Korando III (2010 year). Manual — part 121

15-17

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 compressor

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
ignition angle can be retarded up to 36˚ or advanced up to 20˚ to help idle speed control.

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 coolant temperature is 15°C ~ 40°C when the engine is started.

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

▶
▶
▶
▶

▶

15-18

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

sensor

Coolant temperature

sensor

G20DF Engine

ECU

Relay box in engine

compartment

A/C compressor

Cooling fan module

T-MAP sensor

15-19

0000-00

(3) Input/Output for Cooling Fan and A/C Compressor

15-20

(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

switch

Cooling

fan

Coolant temperature

Refrigerant

pressure

A/C

compressor

OFF

OFF

Coolant temp.<90℃

-

LO

90℃≤Coolant temp.<105℃

-

HI

105℃≤Coolant temp.

-

ON

LO

Coolant temp.<105℃

Refrigerant

pressure<18 bar

ON

HI

18 bar≤Refrigerant

pressure

HI

105℃≤Coolant temp.<115℃

-

HI

115℃≤Coolant temp.

-

OFF (cut)

A/C compressor OFF conditions

▶

Coolant temperature: over 118℃

Approx. 4 seconds after starting the engine

When abrupt acceleration

Refrigerant pressure:
* OFF below 2.0 kg/㎠, then ON over 2.4 kg/㎠
* OFF over 32 kg/㎠, then ON below 26.0 kg/㎠

-

-

-

-

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
to 24 kgf/㎠ with A/C "ON".

Cooling fan control by ATF temperature

▶

ATF temperature

Cooling fan speed

Remark

Over 110˚C

HI

-