SsangYong Rexton. Service 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
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