SsangYong Korando III (2010 year). Service manual — part 414

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

-

15-21

0000-00

7) Immobilizer Control

(1) Overview

The Immobilizer System provides an additional theft deterrent to the vehicle in which it is installed and

prevents it from being started by unauthorized persons. The transponder integrated in the key and the

engine control unit have the same code. When the ignition key with the integrated transponder is turned

to the ON position, the ECU (Engine Control Unit) checks the crypto code of the key and, if correct,

allows the vehicle to start the engine.

For details, refer to Chapter "BCM".

(2) Components

Conditions for cooling fan

▶

Immobilizer

antenna

Immobilizer

key

Start motor

Instrument

cluster

BCM

G20DF ECU