Engine JAC HFC4DA1-2C. Manual — part 99
AT
AT
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AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 185 -
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
8.
Fault diagnosis of blower motor.
Step
Operation
Yes
No
1
①Turn the ignition switch to ON position with the engine off.
②Turn the blower motor switch to each speed position.
If there any speed position failed?
Go to Step 3.
Go to Step 2.
2
Check blower motor fuse for blowout.
Is the fuse blown out?
Replace the fuse with a
new one of the same
rating.
Go to Step 3.
3
Check the power supply of blower motor.
The blower motor won’t run even though there is voltage.
4
①Run the blower under every speed and run once at the integrated radio
control position of blower.
②20 blower speeds should be effective.
Is every blower speed effective?
Go to Step 8.
Go to Step 5.
5
①Plug a 2-pin connector into the back of blower motor.
②Use integrated radio to control blower and run the blower once at each
one of 20 blower speeds.
③Compare the voltage with the illustrated voltage. Please refer to
“1.2.1.2 Sensor Resistance Table” in “Automatic Air Heater,
Ventilation and A/C System” for details.
Does the voltage approach to the illustrated voltage?
Go to Step 8.
Go to Step 6.
6
Connect the fault diagnosis instrument. Conduct combined testing for
switch data. Use fault diagnosis instrument to increase/decrease the soft
key to select from 20 different blower speeds.
Is every speed effective
Conduct integrated radio
control testing for blower
switch function.
Go to Step 7.
7
Replace air heater, ventilation and A/C system control module.
Is the fault detected and eliminated?
Go to Step 8.
8
Run the system to check the maintenance result.
Is the fault eliminated?
System is normal.
Go to Step 1
AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 186 -
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
9.
Diagnosis of poor A/C system refrigeration.
Step
Operation
Yes
No
1
Check the operation of air mixing damper to confirm no blockage or
rupture.
Is air mixing damper blocked or ruptured?
Replace actuator.
Go to Step 2.
2
①Turn the ignition switch to ON position with the engine off.
②Turn the blower motor switch to each speed position.
Is the blower motor able to operate at each speed position?
Go to Step 3.
Go to “Fault 7”.
3
Does blower motor run at corresponding speed?
Go to Step 4.
Go to “Fault 8”.
4
①Start the engine.
②Set the mode switch to “TO-Face” mode.
③Set the internal circulation switch to “ON” position.
④Observe the internal circulation damper.
⑤Set the internal circulation switch to “OFF” position.
Does the internal circulation damper transfer from internal circulation to
ventilation?
Go to Step 5.
Go to “Internal Air
Circulation Fault
Diagnosis Help” in
“Automatic Air
Heater, Ventilation
and A/C System”.
5
①Start the engine.
②Use the fault diagnosis instrument to clear all fault codes stored in air
heater, ventilation and A/C system control module.
③Set the left side air temperature switch to coldest position.
④Set the mode switch to “TO-FACE/FEET” position.
⑤Set the blower motor switch to high speed position.
Does the A/C compressor run?
Go to Step 6.
Replace compressor.
6
Conduct A/C system performance test.
Is the fault detected and eliminated?
Go to Step 9.
Go to Step 7.
7
Install a temperature gauge near the interior air temperature sensor.
Is the indicated temperature below 3℃(5°F)?
Go to Step 9.
Go to Step 8.
8
Check air suction pipe for leak or blockage.
Is the fault detected and eliminated?
Go to Step 9.
—
9
Run the system to check the maintenance result.
Is the fault eliminated?
System is normal.
Go to Step 1
AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 187 -
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
10. Diagnosis for insufficient warm air.
Step
Operation
Yes
No
1
Check the operation of air mixing damper to confirm no blockage or
rupture.
Is air mixing damper blocked or ruptured?
Replace actuator.
Go to Step 2.
2
Turn the blower motor switch to each speed position.
Is the blower motor able to operate at each speed position?
Go to Step 3.
Go to “Fault 7”
3
Does blower motor run at corresponding speed?
Go to Step 4.
Go to “Fault 8”
4
①Start the engine.
②Set the mode switch to “TO-Face” mode.
③Set the internal circulation switch to “ON” position.
④Observe the internal circulation damper.
⑤Set the internal circulation switch to “OFF” position.
Does the internal circulation damper transfer from internal circulation to
ventilation?
Go to Step 5.
Go to “Internal Air
Circulation
Fault
Diagnosis Help” in
“Automatic
Air
Heater,
Ventilation
and A/C System”.
5
Set the temperature switch to “OFF” position.
When heating or defrosting is applied, is it still cold?
Go to Step 6.
Go to Step 9.
6
①Start the engine.
②Shut down the air heater, ventilation and A/C control system.
Does the A/C compressor run?
Replace compressor.
Go to Step 8.
7
Check cooling system for:
Too low coolant level.
Looseness or wear of accessory drive belt.
Leak of radiator hose or heater hose.
Distortion of radiator hose or heater hose.
Lack of radiator cap pressure seal.
Leak of radiator cap.
Is the fault detected and eliminated?
Go to Step 10.
Go to Step 8.
8
①Set the mode switch to “TO-FACE” mode.
②Turn the ignition switch to ON position with the engine off.
③Set the blower motor switch to maximum speed position.
④Cover the sensor air inlet with a piece of paper of 5mm
2
(2 square
inch) to check whether there is any airflow through the interior air
temperature sensor.
Is the paper still at the original position?
Go to Step 10.
Go to Step 9.
9
Check aspirator pipeline for leak or blockage.
Is the fault detected and eliminated?
Go to Step 10.
—
10
Run the system to check the maintenance result.
Is the fault eliminated?
System is normal.
Go to Step 2.
AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 188 -
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
11. Inadequate air out.
Step
Operation
Yes
No
1
①Start the engine.
②Set the mode switch to “OFF” position.
Does the blower stop operation?
Go to Step 2.
Go to Step2
2
①Set the mode switch to “VENT” position.
②Turn the blower motor switch to each speed position.
Is the blower motor able to operate at each speed position?
Go to Step 4.
Go to “Fault 7”
3
Does blower motor run at corresponding speed?
Go to Step 4.
Go to “Fault 8”
4
Check mode damper for any damage or blockage.
Is the mode damper damaged or blocked?
Replace mode damper.
Go to Step 5.
5
Run the system to check the maintenance result.
Is the fault eliminated?
System is normal.
Go to Step 1
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