Engine JAC HFC4DA1-2C. Instruction - page 100

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Air

Air

Air Conditioner

Conditioner

Conditioner

Conditioner

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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

12. Fault diagnosis of internal/external circulation.

Step

Operation

Yes

No

1

①Turn the ignition switch to ON position with the engine off.

②Set the blower motor switch to maximum speed position.

③Set the mode switch to “TO-FACE/FEET” position.

④Set the internal circulation switch to “VENTILATION” position.

⑤Set the internal circulation switch to “INTERNAL CIRCULATION”

position.

Do you hear any change in air flow sound when setting the internal
circulation switch to “INTERNAL CIRCULATION” position?

Go to Step 2.

Go to Step 2.

2

①Set the internal circulation switch to “VENTILATION” position.

②Observe the drive shaft of internal circulation actuator.

③Set the internal circulation switch to “INTERNAL CIRCULATION”

position.

Does the drive shaft of internal circulation actuator rotate?

Go to Step 3.

Go to Step 3.

3

①Observe the drive shaft of internal circulation actuator.

②Use the fault diagnosis instrument and command the internal

circulation actuator transfer to “INTERNAL CIRCULATION” and
“VENTILATION” positions.

Does the drive shaft of internal circulation actuator rotate?

Go to Step 11.

Go to Step 4.

4

①Turn the ignition switch to OFF position.

②Disconnect the internal circulation actuator.

③Turn the ignition switch to ON position with the engine off.

④Use a test lamp connected to sound ground to detect the ignition

voltage circuit 3 of internal circulation actuator.

Is the test lamp on?

Go to Step 5.

Go to Step 12.

5

①Set a test lamp between damper control Circuit A and ignition voltage

circuit 3 of internal circulation actuator.

②Use the fault diagnosis instrument and command the internal

circulation actuator transfer to “INTERNAL CIRCULATION” and
“VENTILATION” positions.

Is the test lamp on when this command is executed?

Go to Step 6.

Go to Step 7.

6

①Set a test lamp between damper control circuit B and ignition voltage

circuit 3 of internal circulation actuator.

②Use the fault diagnosis instrument and command the internal

circulation actuator transfer to “INTERNAL CIRCULATION” and
“VENTILATION” positions.

Is the test lamp on when this command is executed?

Go to Step 9.

Go to Step 8.

7

Check the internal circulation actuator control Circuit A for open circuit,
excessive resistance, short circuit to ground or voltage.

Is the fault detected and eliminated?

Go to Step 15.

Go to Step 11.

8

Check the internal circulation actuator control Circuit B for open circuit,
excessive resistance, and short circuit to ground or voltage.

Is the fault detected and eliminated?

Go to Step 15.

Go to Step 11.

AT

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AT Air

Air

Air

Air Conditioner

Conditioner

Conditioner

Conditioner

- 190 -

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

13. Fault diagnosis of internal/external circulation.

Step

Operation

Yes

No

9

Check internal circulation damper and internal circulation actuator for:

Dislocation of circulation actuator.

Linkage fractured or stuck.

Internal circulation damper fractured or stuck.

Obstacle blocking the internal circulation damper moving within the

whole range.

Lack of internal circulation damper seals.

Dislocation of internal circulation damper seals.

Is the fault detected and eliminated?

Go to Step 15.

Go to Step 10.

10

Check the harness connector of internal circulation actuator for poor
contact.

Is the fault detected and eliminated?

Go to Step 15.

Go to Step 13.

11

Check the harness connector of air heater, ventilation and A/C system
control module for poor contact.

Is the fault detected and eliminated?

Go to Step 15.

Go to Step 14.

12

Repair the ignition voltage circuit of internal circulation actuator.

Is the repair finished?

Go to Step 15.

13

Replace the internal circulation actuator.

Is the replacement finished?

Go to Step 15.

14

Replace air heater, ventilation and A/C system control module.

Is the replacement finished?

Go to Step 15.

15

Run the system to check the maintenance result.

Is the fault eliminated?

System is normal.

Go to Step 2.

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Air Conditioner

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Removal/Installation

Removal/Installation

Removal/Installation

Removal/Installation

Removal

Removal

Removal

Removal of

of

of

of front

front

front

front A/C

A/C

A/C

A/C assembly

assembly

assembly

assembly

1.

Recover refrigerant.

2.

Disconnect negative cable of battery.

3.

Remove instrument panel.

4.

Remove mounting bolts from expansion valve.

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Air Conditioner

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Conditioner

Conditioner

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Removal/Installation

Removal/Installation

Removal/Installation

Removal/Installation

Removal

Removal

Removal

Removal of

of

of

of front

front

front

front A/C

A/C

A/C

A/C assembly

assembly

assembly

assembly

5.

Remove mounting bolts from front A/C.

6.

Disconnect the connector and remove the front A/C
assembly.

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