SsangYong Actyon Sports II. Manual — part 61
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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
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Cooling fan controls according to ATF
▶
ATF temperature
Fan condition
Remark
Over 110˚C
High speed
-
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Relay box in engine compartment
(13) PTC heater control
A. Overview
The supplementary electrical heater is installed in DI engine equipped vehicle as a basic equipment. The
PTC system is operated according to two temperature values measured at the coolant temperature
sensor and HFM sensor. This device is mounted in the heater air outlet and increase the temperature of
air to the passenger compartment. Because PTC system is heated by electrical power, high capacity
alternator is required. PTC does not operate during engine cranking, while the battery voltage is lower
than 11 V or during preheating process of glow plugs.
B. Components
HFM (intake air
temperature)
Coolant temperature
sensor
PTC heater
PTC 2 relay (PTC
heater 2, 3)
PTC heater
3 (40A)
PTC heater
2 (40A)
PTC heater
1 (40A)
D20DTR ECU
PTC 1 relay
(PTC heater 1)
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C. Operation process
The ceramic PTC has a feature that the resistance goes up very high at a certain temperature. There
are three circuits in PTC heater. Only one circuit is connected when PTC1 relay is ON, and two circuits
are connected when PTC2 relay is ON.
Operation process: reaches at a certain temperature→high resistance→low current→less heat
radiation→temperature down→high resistance→high current→temperature up
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D. Control conditions
Operation
Operating condition
PTC Heater
HI
(PTC2)
- Coolant temperature < 15℃
PTC HI ON
LO
(PTC1)
- Coolant temperature 15℃ ≤ 65℃, intake air
temperature ≤ -10℃
- Coolant temperature 15℃ < 65 to 60℃, intake air
temperature <-10℃ to 0℃
- Coolant temperature 15℃ ≤ 60℃, intake air
temperature ≤ 0℃ to 5℃
PTC LO ON
Stop
- A/C blower switch OFF
- Defective ambient air temperature sensor
(including open or short circuit)
- Engine cranking
- Low battery voltage (below 11V)
- During pre-glow process (glow indicator ON)
Operation diagram for PTC heater LO (step 2)
▶
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