SSANGYONG REXTON 2006.09 Manual page 802

0-96 6810-20
C. SYSTEM DIAGRAM
▶ Air Conditioner Compressor Control by Engine ECU
In case of current vehicle models, the system turns ON/OFF the compressor switch
according to refrigerant pressure, ambient temperature and condenser temperature to
protect air conditioner circuits. However, for the vehicle equipped with DI engine, the
engine ECU turns off air conditioner compressor as below in addition to above conditions.
- Coolant temperature: below -20°C
-
Coolant temperature: over 115°C
- For approx. 4 seconds after starting the engine
- When engine speed is below 650 rpm
- When engine speed is over 4,500 rpm
- During abrupt acceleration for the vehicle equipped with manual transmission
CIRCUIT
REXTON 2006.09
D. ACTIVE INCAR/HUMIDITY SENSOR (AIH SENSOR)
The AIH sensor is installed at the driver side instrument panel undercover. It is a sensor that
detects interiortemperature and humidity.
▶Functions
- Interior temperature sensor
This sensor is a negative temperature coefficient (NTC) thermistor and detects the
interior temperaturewith air coming from senor hole and then sends the voltage value
according to the changed resistance toFATC controller.
- Humidity sensor
This sensor detects the interior humidity with humidity cell and then sends the voltage
value according tothe changed humidity to FATC controller.
▶Inspection
If the active incar sensor defect code (DTC 1) and the humidity sensor defect code (DTC
10) are set, check as below:
- Active incar sensor
Remove the integrated AIH sensor and measure the resistance between terminal
·
No. 5 and 6 on thesensor connector. (standard: approx. 25°C,
· If the measured value is out of the specified range, replace the AIH sensor. If the
measured values arewithin the specified range, check as below.
· Turn the ignition switch to ON position and measure the voltage to active incar
sensor from the FATCcontroller connector. (standard: approx. 2 V at 25°C)
· If the voltage value cannot be measured, check the circuit for open. If the measured
value is within thespecified range, replace the FATC controller.
- Humidity sensor
Apply 5 V to terminal No. 1 and 3 on the humidity sensor connector.
·
· Connect the positive (+) probe of a tester on No. 2 terminal and the negative (-)
probe on No. 3 terminal, andmeasure the output voltage while the voltage is
applied. (output voltage: approx. 0.8 ~ 3.4 V)
· Check whether the output voltage is changed when blowing into the inlet of the
sensor. If there is avoltage change, the sensor is in normal condition. However, if
the voltage is not changed, replace thehumidity sensor.
· In addition, if the output voltage is extremely high or low even in the specified range,
replace the humid-ity sensor.
2.2 kW)