Daewoo Korando. Service manual - part 322

FATC-HAVC  7D-15

TROUBLESHOOTING

Check and Service

Incar sensor is a sensor that detects interior air temperature
and a thermistor that decreases its resistance when temperature
up and increases when temperature down.

1. Check that there are incar sensor fault code (11,12) by

using self-diagnosis function.

2. Disconnect incar sensor 2-pin connector that installed on

inner lower instrument panel cover of driver’s side and
remove the sensor.

3. Check that measured resistance value among incar sensor

terminals is as shown in the right side graph.

Notice

Measure resistance value by soaking the sensor in the ice
water and check changes in resistance values after soaking
it in the very hot water.

4. If resistance value is out of specification, replace the incar

sensor.

5. Install the sensor and turn the ignition switch to ON position

and check that voltage between No. 12A terminal of incar
sensor and body (-) is 5V.

6. Check current between the No. 12B and 12A connector

terminals of the incar sensor and the No. 1 and 5 connector
terminals of the airconditioner control unit and repair the
wire if defective.

12B 12A

Incar sensor connector

¯

0.5LW

Airconditioner control unit connector

V

5

¯

0.5BL

1

7D-16  FATC-HAVC

9

10

Ambient sensor connector

2

¯

0.5W

Airconditioner control unit connector

V

5

¯

0.5BL

Ambient Sensor

Ambient sensor is a sensor that detects ambient temperature
and a thermistor that decreases its resistance when temperature
up and increases when temperature down.

1. Check that there are ambient sensor fault code (13,14) by

using self-diagnosis function.

2. Disconnect ambient sensor 2-pin connector that installed

on front right side of the frame and remove the sensor.

3. Check that measured resistance value among ambient

sensor terminals is as shown in the right side graph.

Notice

Measure resistance value by soaking the sensor in the ice
water and check changes in resistance values after soaking
it in the very hot water.

4. If resistance value is out of specification, replace the ambient

sensor.

5. Install the sensor and turn the ignition switch to ON position

and check that voltage between No. 10 terminal of the
ambient sensor and body (-) is 5V.

6. Check current between the No. 10 and 9 connector terminals

of the ambient sensor and the No. 2 and 5 connector
terminals of the airconditioner control unit and repair the
wire if defective.

FATC-HAVC  7D-17

7b

7a

Water sensor connector

3

¯

0.5RB

Airconditioner control unit connector

V

5

¯

0.5BL

Water Sensor

Water sensor is a thermistor that detects engine coolant
temperature to operate the blower speed to LO when water
temperature is less than 50.

1. Check that there are water sensor fault code (15,16) by

using self-diagnosis function.

3. Check that measured resistance value among water sensor

terminals is as shown in the right side graph.

Notice

Measure resistance value by soaking the sensor in the ice
water and check changes in resistance values after soaking
it in the very hot water.

4. If resistance value is out of specification, replace the water

sensor.

5. Install the sensor and turn the ignition switch to ON position

and check that voltage between No. 7a terminal of the water
sensor and body (-) is 5V.

6. Check current between the No. 7a and 7b connector

terminals of the water sensor and the No. 3 and 5 connector
terminals of the airconditioner control unit and repair the
wire if defective.

2. Disconnect water sensor 2-pin connector that installed on

the heater unit of inner instrument panel and remove the
water sensor.

7D-18  FATC-HAVC

0.5WL

12

-

13b 13a

11

0.5WR

-

Sun load sensor
connector

Airconditioner
control unit
connector

13b 13a

V

Sun load sensor
connector

11

13a

mA

Airconditioner
control unit
connector

0.32

200

400

600

800

(660)

Output current (mA)

(Kcal/m

2

 h)

Sun load Sensor

Sun load sensor is a photo diode that detects lights. Resistance
of diode can be measured as current by using multimeter
according to increasing sun loads.

1. Check current on the circuits between the sun load sensor

and the airconditioner control unit.

2. Turn the ignition switch to ON position and check that voltage

between No. 13a terminal of the sun load sensor and vehicle
ground is 5V.

3. Measure current between No. 13a terminal of the sun load

sensor and No. 11 terminal of the control unit and check it is
as shown in the below graph.

4. If current value is out of specification, replace the sun load

sensor.