0-98
REXTON 2007.09
6810-20
CIRCUIT
G. SUN SENSOR
▶Inspection
It is installed on the upper left end of instrument panel. It is using characteristics that the
amount of currentchanges according to amount of light on the photosensitive surface. Photo
diode, converts the changes in lightintensity into electrical changes, detects the amount o
light coming through windshield and changes it intocurrent and then sends the signal to
FATC controller.
Remove the sun sensor and measure the current between terminals under sunlight.
Measure the current again under shade. It is in normal conditions if the measured
value is less than themeasured value under sunlight.
Turn the ignition switch to “ON” position.
Measure the voltage to the sun sensor from FATC connector. (approx. 2.5 V unde
sunlight and 4.8 Vunder shade.)
If the voltage value cannot be measured, check the circuit for open. If the measured
value is within thespecified range, replace the FATC controller.
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H. WATER TEMPERATURE SENSOR
Remove the water temperature sensor and measure the resistance between
terminals on the sensorconnector. (standard: approx. 25°C, 2.2 kW)In addition,
if the resistance is extremely high or, replace the sensor.
2. If the measured value is out of the specified range, replace the water temperature
sensor. If the measured value is within the specified range, check as below.
3. Turn the ignition switch to ON position and measure the voltage to wate
temperature sensor from theFATC controller connector. (standard: approx. 2 V at
25°C)
4. If the voltage value cannot be measured, check the circuit for open. If the
measured value is within thespecified range, replace the FATC controller.
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▶Inspection
Remove the intake sensor and measure the voltage between terminal No. 1 and 2 on
the connector.
Check whether the output voltages (ON: approx. 12 V, off: 0 V).
If the voltage value is out of the specified value, replace the intake sensor. If the circuit
is in normalcondition, check as below.
Turn the ignition switch to ON position and turn on the air conditioner by pressing the
A/C button. Andmeasure the voltage between terminal A12 and A11 on the FATC
controller connector. (standard: approx.12 V)
If the voltage value cannot be measured, check the circuit for open. If the measured
value is within thespecified range, replace the FATC controller.
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The water temperature sensor is installed on the top of heater unit. It detects the inside
temperature of waterand transmits the voltage value that is changed according to resistance
value (NTC) to FATC controller.
If the water temperature sensor defect code (DTC 3) is set, check as below.
The power transistor controls the fan speed. It controls the blower motor operating speed
without stages bychanging the current value to the base of power transistor when receiving
the fan control signal from FATC.
J. POWER
TRANSISTOR
I. POWER TRANSISTOR
The intake sensor outputs the compressor ON or OFF signal to ECU to prevent evaporato
from freezing. Thesensing part of the thermistor is the evaporator fin contact type.
If the air conditioner does not turn on, check as below.
K. VEHICLE SPEED CALIBRATION
On the Ambient or the 1/3 Ambient and the blower AUTO, the blower decreases the voltage
with the vehiclespeed 100 Km/h such as 1.5 V for the Ambient, 1.0 V for the 1/3
mbient.But
it is the exception for the blower max.
L. WIPER CALIBRATION CONTROL
It is possible to generate the frost on the windshield in the rainy days. At this time, FATC
controller allows themode to change the AUTO defroster mode.
Operation Condition: When the passenger operates the wiper on AUTO mode, the
system controls thewiper on the A/C AUTO mode after sending the wiper signal and
controlling the delay for 1 minutes.
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