SsangYong Rexton. Manual - part 637

SSANGYONG  Y200

7D-14  AUTOMATIC CONTROL HVAC SYSTEM

DIAGNOSTIC INFORMATION AND PROCEDURES

GENERAL DIAGNOSIS

The full automatic temperature control (FATC) air
conditioning controller contains a self-diagnosis
function to aid in finding any problem with the system.

General A/C Diagnosis

Refer to Section 7B, Manual Control Heating,
Ventilation, and Air Conditioning System for details of
the following procedures:

•

A/C Performance Test.

•

Insufficient Cooling “Quick Check” Procedure.

•

Insufficient Cooling Diagnosis.

•

Leaking Testing the Refrigerant System.

•

Low-and High-Side Pressure Relationship Chart.

•

Pressure-Temperature Relationship of R-134a.

•

Testing the refrigerant system.

•

Pressure Test Chart (R-134a System).

If the FATC detects some errors it will blink the
temperature display screen for 5 seconds when the
ignition switch is ON.

When there are some errors in the automatic
temperature control system without displaying the
faulty code, perform the diagnostic test using the
applicable table.

YAD7D150

AUTOMATIC CONTROL HVAC SYSTEM  7D-15

SSANGYONG  Y200

INSUFFICIENT COOLING DIAGNOSIS

1. Check the A/C fuse.
2. Check the operation of the blower motor and cooling fan.

3. Check the accessory belt.
4. Check the A/C condenser for restricted air flow.

5. Check the engagement of the compressor clutch.

6. Check the discharge air temperature with the A/C turned ON.
Are all above the operations normal?

1. Turn the ignition to LOCK.
2. Connect the high/low pressure gauges.

Are both pressures within the specified value?

1. If it’s above the specified value, discharge the refrigerant.
2. If it’s below the specified value, add 0.45 kg (1 pound) of the

refrigerant and repair any leaks as needed.

3. Recover, evacuate and recharge the A/C system.
Is the repair complete?

1. Start the engine and allow it to run at idle.

2. Turn the A/C switch to ON.
3. Set the blower motor switch to 4th.

4. Set the temperature control lever to full cold.
Does the A/C compressor clutch engage?

1. Turn the ignition to LOCK.

2. Check the open or short in the compressor wiring.
Is there any open or short in the wiring?

Repair the faulty wiring as needed.

Is the repair complete?
Replace the compressor clutch coil.

Is the replacement complete?
Check for a knocking noise from the A/C compressor. Cycle the A/C
compressor ON and OFF in order to verify the source of the noise.

Do you hear a loud knocking noise?

1. Recover the A/C system refrigerant.
2. Replace the A/C compressor.

3. Evacuate and recharge the A/C system.
4. Check the A/C system for leaks.

Is the compressor running normally?

1. Close all of the windows and doors.
2. Set the A/C switch to ON position.

3. Set the intake air control switch to “Fresh Air”.
4. Set the blower motor switch to 4th.

5. Set the temperature control switch to full cold.

6. Keep it to run at idle for 5 minutes.
7. Check the temperature at the inlet/outlet of the evaporator.

Is there a noticeable difference in the temperature of the evaporator
inlet/outlet pipes?

Action

Step

1

2

3

4

5

6

7

8

9

10

Yes

No

System OK

Go to Step 2

Go to Step 4

Go to Step 3

System OK

-

Go to Step 8

Go to Step 5

Go to Step 6

Go to Step 7

System OK

-

System OK

-

Go to Step 9

Go to Step 10

System OK

-

Go to Step 11

Go to Step 13

SSANGYONG  Y200

7D-16  AUTOMATIC CONTROL HVAC SYSTEM

Insufficient Cooling Diagnosis (Cont’d)

1. Recover the A/C system refrigerant.

2. Replace the expansion valve as needed.
3. Evacuate and recharge the A/C system.

4. Check the A/C system for leaks.

5. Operate the A/C system.
Is the discharge temperature normal?

1. Recover the refrigerant of the A/C system.
2. Evacuate and recharge the A/C system.

3. Check the A/C system for leaks.

Does the A/C system operate normally?
Feel the liquid pipe between the condenser and the expansion valve.

Is the pipe cold?
1. Repair any restriction in high pressure side.

2. Check the A/C system for leaks.

Does the A/C system operate normally?
1. Run the engine at 3,000 rpm.

2. Close all of the windows and doors.
3. Set the A/C switch to ON.

4. Set the blower motor switch to 4th.

5. Set the temperature control switch to full cold.
6. Turn the A/C switch ON and OFF every 20 seconds for 3 minutes.

7. Measure the compressor high and low pressure.

Are both pressures within the specified value?
Add the specified amount of the refrigerant to the A/C system.

Is the amount within the specified value?
1. Turn the ignition to LOCK.

2. Set the A/C switch to OFF position.

Can you turn the compressor clutch freely by hand?
1. Check the A/C system for leaks.

2. Repair any leaks as needed.
3. Evacuate and recharge the A/C system.

Does the A/C system operate normally?

1. Recover the refrigerant of the A/C system.
2. Evacuate and recharge the A/C system.

3. Check the A/C system for leaks.
4. Replace the compressor as needed.

Is the repair complete?

Action

Step

11

12

13

14

15

16

17

18

19

Yes

No

Go to Step 13

Go to Step 12

System OK

-

Go to Step 15

Go to Step 14

System OK

-

Go to Step 17

Go to Step 16

System OK

-

Go to Step 18

Go to Step 19

System OK

-

System OK

-

AUTOMATIC CONTROL HVAC SYSTEM  7D-17

SSANGYONG  Y200

FULL AUTOMATIC  TEMPERATURE CONTROL (FATC) DOES NOT

OPERATE  WHEN  THE IGNITION IS ON

CONTROLLER DOES NOT ILLUMINATE  WHEN LIGHT SWITCH IS ON

Check the fuse F18.
Are the fuses blown?

Replace the fuse.
Is the repair complete?

1. Remove the controller with connecting ATC wiring connector.

2. Turn the ignition switch to ON.
3. Measure the voltage between terminal A1 and A5 of the connectors

Is the voltage within specified value?
Replace the controller.

Is the repair complete?

Measure the voltage between terminal A5 of the connector and ground.
Is the voltage within specified value?

Repair the faulty circuit between fuse F18 and terminal A5 of the ATC
wiring connector.
Is the repair complete?

Repair the faulty circuit between the ground G203 and terminal A1 of
the ATC wiring connector.

Is the repair complete?

Action

1. Remove the controller with connecting ATC wiring connector.

2. Turn the ignition switch to ON.
3. Measure the voltage between terminal A4 and A3 of the controller.

Is the voltage within the specified value?
Repair the wiring harness between splice S206 and terminal A3 of the
controller connector or between splice S206 and terminal A4 of the
controller connector.

Is the repair complete?

Check the illumination bulb.
Is the bulb burned out?

Check the illumination bulb.
Is the repair complete?

Replace the controller.

Is the repair complete?

Action

Step

1

2

3

4

5

6

7

Yes

No

Go to Step 3

Go to Step 2

System OK

-

Go to Step 15

11 - 14 V

Go to Step 4

System OK

-

Go to Step 6

Go to Step 7

System OK

-

System OK

-

Step

1

2

3

4

5

Yes

No

System OK

-

System OK

-

Go to Step 4

Go to Step 5

System OK

-

Go to Step 3

11 V - 14 V

Go to Step 2