SsangYong Actyon Sports II. Manual — part 73
06-9
2110-01
3. PWM (PULSE WIDTH MODULATION) ELECTRIC FAN
OPERATION
1) Function
The PWM (Pulse Width Modulation) high capacity electric fan is installed instead of electric condenser
fan to enhance the durability and controllability and reduce noise.
2) Mounting Location
PWM
Fan shroud
Electric fan
PWM unit
06-10
3) PWM Electric Fan
(1) Advantages and Disadvantages of the PWM Electric Fan
Advantages
▶
Enhanced A/C performance: at low speed, at
idling, driving in city
Reduction of vibration/noise: fan activated by
PWM only when necessary
Reduction of engine consuming power
(V/Fan driving force) by 4 Hp - Cost saving
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Disadvantage
▶
Poor engine cooling perfomance at low and
high rpm
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4) PWM (Pulse Width Modulation) Unit
It controls the time of the output voltage to control
the fan motor speed independently.
Internal functions
▶
Motor power shutting-off function when
overcurrent is applied
Adverse voltage prevention function
Detection function for the motor lock
Temperature detecting function: The electric
fan operates at FULL speed to cool down
the PWM unit when the interior temperature
of PWM unit is over 120~150°C.
Communication function when failing: The
fail signal is transmitted to the ECU when the
PWM unit is malfunctioning.
Soft start function: The motor speed is
gradually increased when the motor is
initially operated.
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06-11
2112-01
5) Shutting-off Condition of the A/C Compressor
Coolant temperature
▶
When coolant temperature is below 20°C or over 115°C, engine speed is below 650 rpm or
over 4500 rpm for 4 seconds after engine starting, abrupt acceleration and A/C refrigerant
pressure sensor detecting the followings
A/C compressor is turned off when the refrigerant pressure is below 2.0 kg/cm2 and then is
turned on when the refrigerant pressure is over 2.4 kg/cm2.
A/C compressor is turned off when the refrigerant pressure is over 30 kg/cm2 and then is turned
on when the refrigerant pressure is below 21.4 kg/cm2.
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07-3
1452-01
1. DIAGNOSTIC INFORMATION AND PROCEDURE
1) Ignition System
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