SsangYong Korando III (2010 year). Manual — part 372
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d. Oxygen sensor control
The wide band oxygen sensor uses ZnO2. It produces the voltage by movement of oxygen ions when
there is oxygen concentration difference between exhaust gas and atmosphere.
If a certain voltage is applied to the sensor, the movement of oxygen ions occurs regardless of the
oxygen density. The current generated through this flow of ions, is called pumping current (IP), and the
oxygen sensor measures this value.
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Coolant temp.
sensor
Refrigerant pres.
sensor
A/C compressor
ECU
D20DTF
DSI 6 A/T
(ATF temp.)
Cooling fan module
HFM sensor
(Intake air
temperature)
Engine room
relay box
(8) Cooling fan control
a. 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 (200W+150W) in D20DTF engine. ECU controls the electric cooling fans
with three cooling fan relays to improve the engine torque and air conditioning performance.
For details about A/C compressor and refrigerant pressure sensor, refer to Chapter "Air Conditioning
System" in "Body" section.
b. Components
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c. Input/Output for cooling fan and A/C compressor
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d. 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: below -20℃ or over
115℃
Approx. 4 seconds after starting the engine
Engine rpm: below 650 rpm or over 4500 rpm
When abrupt acceleration
Refrigerant pressure:
* OFF below 2.0 kg/㎠, then ON over 2.4 kg/㎠
* OFF over 30 kg/㎠, then ON below 21.4 kg/㎠
-
-
-
-
-
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".
Output voltage according to refrigerant pressure
▶
Cooling fan control according to ATF temperature
▶
ATF temperature
Cooling fan
Remark
Over 100˚C
High speed
-
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