Mazda 6. Manual — part 389

U–60

ON-BOARD DIAGNOSTIC

End Of Sie

DTC 19

A6E857001038W12

Diagnostic Procedure

End Of Sie

DTC 21

A6E857001038W13

Diagnostic Procedure

End Of Sie

2

• Disconnect airflow mode actuator connector.

• Is resistance between terminals 1U and 1I of

climate control unit connector (24-pin) more
than 387 ohms?

Yes

Go to next step.

No

Repair wiring harness. (Short circuit)

3

• Disconnect climate control unit connector

(24-pin).

• Is resistance between terminals 1B and 1I of

climate control unit connector (24-pin) less
than 4.8 kilohms?

Yes

Go to next step.

No

Repair wiring harness. (Open circuit)

4

• Is resistance between terminals 1B and 1U

of climate control unit connector (24-pin) less
than 4.2 kilohms?

Yes

Replace climate control unit.

No

Repair wiring harness. (Open circuit)

STEP

INSPECTION

ACTION

DTC 19

Air mix actuator (potentiometer) system inspection

POSSIBLE

CAUSE

• Air mix actuator malfunction

• Climate control unit malfunction

• Open circuit between air mix actuator and climate control unit

• Short circuit between air mix actuator (terminal C) and climate control unit (terminal 1U: 24-pin)

STEP

INSPECTION

ACTION

1

• Inspect air mix actuator.

• Is it okay?

Yes

Go to next step.

No

Replace air mix actuator.

2

• Disconnect climate control unit connector

(24-pin) and air mix actuator connector.

• Is there open circuit between following

terminals of climate control unit connector
(24-pin) and air mix actuator connector?
— 1B—B
— 1U—C
— 1I—A

Yes

Repair wiring harness.

No

Go to next step.

3

• Is there short circuit to ground between

terminal 1U of climate control unit connector
(24-pin) and terminal C of air mix actuator
connector?

Yes

Repair wiring harness.

No

This system is normal at present. (Erase the past failure
from memory.)

DTC 21

Airflow mode actuator (potentiometer) system inspection

POSSIBLE

CAUSE

• Airflow mode actuator malfunction

• Climate control unit malfunction

• Open circuit between airflow mode actuator and climate control unit

• Short circuit between airflow mode actuator (terminal C) and climate control unit (terminal 1W: 24-pin)

STEP

INSPECTION

ACTION

1

• Inspect airflow mode actuator.

• Is it okay?

Yes

Go to next step.

No

Replace airflow mode actuator.

2

• Disconnect air mix actuator connector.

• Is resistance between terminals 1W and 1I of

climate control unit connector (24-pin) more
than 387 ohms?

Yes

Go to next step.

No

Repair wiring harness. (Short circuit)

3

• Disconnect climate control unit connector

(24-pin).

• Is resistance between terminals 1B and 1I of

climate control unit connector (24-pin) less
than 4.8 kilohms?

Yes

Go to next step.

No

Repair wiring harness. (Open circuit)

4

• Is resistance between terminals 1B and 1W

of climate control unit connector (24-pin) less
than 4.2 kilohms?

Yes

Replace climate control unit.

No

Repair wiring harness. (Open circuit)

ON-BOARD DIAGNOSTIC

U–61

U

DTC 22

A6E857001038W14

Diagnostic Procedure

End Of Sie

DTC 58

A6E857001038W15

Diagnostic Procedure

End Of Sie

DTC 59

A6E857001038W16

DTC 22

Airflow mode actuator (potentiometer) system inspection

POSSIBLE

CAUSE

• Airflow mode actuator malfunction

• Climate control unit malfunction

• Open circuit between airflow mode actuator and climate control unit

• Short circuit between airflow mode actuator (terminal C) and climate control unit (terminal 1W: 24-pin)

STEP

INSPECTION

ACTION

1

• Inspect airflow mode actuator.

• Is it okay?

Yes

Go to next step.

No

Replace airflow mode actuator.

2

• Disconnect climate control unit connector

(24-pin) and air mix actuator connector.

• Is there open circuit between following

terminals of climate control unit connector
(24-pin) and airflow mode actuator
connector?
— 1B—B
— 1W—C
— 1I—A

Yes

Repair wiring harness.

No

Go to next step.

3

• Is there short circuit to ground between

terminal 1W of climate control unit connector
(24-pin) and terminal C of airflow mode
actuator connector?

Yes

Repair wiring harness.

No

This system is normal at present. (Erase the past failure
from memory.)

DTC 58

Air mix actuator (motor lock) system inspection

POSSIBLE

CAUSE

• Air mix actuator malfunction

• A/C unit (air mix link and/or air mix crank) malfunction

• Climate control unit malfunction

• Open or short circuit between air mix actuator and climate control unit

STEP

INSPECTION

ACTION

1

• Disconnect air mix actuator connector.

• Connect battery positive voltage to terminal

D (or terminal F) and ground to terminal F (or
terminal D) of air mix actuator connector.

• Does air mix actuator operate?

Yes

Connect air mix actuator connector, then go to Step 3.

No

Go to next step.

2

• Remove air mix actuator.

• Operate air mix link by hand.

• Does air mix link operate smoothly?

Yes

Replace air mix actuator.

No

Replace air mix link and/or air mix crank.

3

• Disconnect climate control unit connect (12-

pin).

• Connect battery positive voltage to terminal

2D (or terminal 2C) and ground to terminal
2C (or terminal 2D) of climate control unit
connector (24-pin).

• Does air mix actuator operate?

Yes

Replace climate control unit.

No

Repair wiring harness.

DTC 59

Airflow mode actuator (motor lock) system inspection

POSSIBLE

CAUSE

• Airflow mode actuator malfunction

• A/C unit (airflow mode links and/or airflow mode cranks) malfunction

• Climate control unit malfunction

• Open or short circuit between airflow mode actuator and climate control unit

U–62

ON-BOARD DIAGNOSTIC

Diagnostic Procedure

End Of Sie

DTC 02, 18, 21 (WHEN TWO OR MORE DTCS ARE INDICATED AT THE SAME TIME)

A6E857001038W17

Diagnostic Procedure

End Of Sie

DTC 06, 10, 12, 14, 18, 21 (WHEN TWO OR MORE DTCS ARE INDICATED AT THE SAME TIME)

A6E857001038W18

STEP

INSPECTION

ACTION

1

• Disconnect airflow mode actuator connector.

• Connect battery positive voltage to terminal

D (or terminal F) and ground to terminal F (or
terminal D) of airflow mode actuator
connector.

• Does airflow mode actuator operate?

Yes

Connect airflow mode actuator connector, then go to Step 3.

No

Go to next step.

2

• Remove airflow mode actuator.

• Operate airflow mode main link by hand.

• Does airflow mode main link operate

smoothly?

Yes

Replace airflow mode actuator.

No

Replace airflow mode links and/or airflow mode cranks.

3

• Disconnect climate control unit connect (12-

pin).

• Connect battery positive voltage to terminal

2G (or terminal 2E) and ground to terminal
2E (or terminal 2G) of climate control unit
connector (24-pin).

• Does airflow mode actuator operate?

Yes

Replace climate control unit.

No

Repair wiring harness.

DTC 02, 18, 21

Climate control unit (+5 V power supply) inspection

POSSIBLE

CAUSE

• Climate control unit malfunction

• Short circuit between climate control unit and solar radiation sensor

• Short circuit between climate control unit and air mix actuator

• Short circuit between climate control unit and airflow mode actuator

• Open circuit between climate control unit and solar radiation sensor

• Open circuit between climate control unit and air mix actuator

• Open circuit between climate control unit and airflow mode actuator

STEP

INSPECTION

ACTION

1

• Disconnect climate control unit cooonnector

(24-pin) and airflow mode actuator
connector.

• Is there continuity between terminal 1B of

climate control unit connector (24-pin) and
terminal B of airflow mode actuator
connector?

Yes

Go to next step.

No

Repair wiring harness.

2

• Is there short circuit to ground between

terminal 1B of climate control unit connector
(24-pin) and terminal B of airflow mode
actuator connector?

Yes

Repair wiring harness.

No

Go to next step.

3

• Is there short circuit to ground between

terminal 1B of climate control unit connector
(24-pin) and terminal B of air mix actuator
connector?

Yes

Repair wiring harness.

No

Go to next step.

4

• Is there short circuit to ground between

terminal 1B of climate control unit connector
(24-pin) and terminal A of solar radiation
sensor connector?

Yes

Repair wiring harness.

No

Replace climate control unit.

DTC 06, 10, 12,

18, 21

Climate control unit (+5V power supply or sensor ground system) or sensor ground system
inspection

POSSIBLE

CAUSE

• Climate control unit malfunction

• Open circuit between climate control unit and each temperature sensor

• Open circuit between climate control unit and air mix actuator

• Open circuit between climate control unit and airflow mode actuator

ON-BOARD DIAGNOSTIC

U–63

U

Diagnostic Procedure

End Of Sie

DTC 07, 11, 13, 15, 19, 22 (WHEN TWO OR MORE DTCS ARE INDICATED AT THE SAME TIME)

A6E857001038W19

Diagnostic Procedure

End Of Sie

DTC 19, 22 (WHEN TWO OR MORE DTCS ARE INDICATED AT THE SAME TIME)

A6E857001038W20

Diagnostic Procedure

End Of Sie

STEP

INSPECTION

ACTION

1

• Disconnect climate control unit connector

(24-pin) and evaporator temperature sensor
connector.

• Is there continuity between terminal 1I of

climate control unit connector (24-pin) and
terminal A of evaporator temperature sensor
connector?

Yes

Replace climate control unit.

No

Repair wiring harness.

DTC 07, 11, 13,

15, 19, 22

Climate control unit (+5V power supply or sensor ground system) or sensor ground system
inspection

POSSIBLE

CAUSE

• Climate control unit malfunction

• Open circuit between climate control unit each temperature sensor

• Open circuit between climate control unit and air mix actuator

• Open circuit between climate control unit and airflow mode actuator

STEP

INSPECTION

ACTION

1

• Disconnect climate control unit connector

(24-pin) and evaporator temperature sensor
connector.

• Is there open circuit between terminal 1I of

climate control unit connector (24-pin) and
terminal A of evaporator temperature sensor
connector?

Yes

Repair wiring harness.

No

This system is normal at present. (Erase the past failure
from memory.)

DTC 19, 22

Climate control unit (+5V power supply) inspection

POSSIBLE

CAUSE

• Climate control unit malfunction

• Short circuit between climate control unit and solar radiation sensor

• Short circuit between climate control unit and air mix actuator

• Short circuit between climate control unit and airflow mode actuator

• Open circuit between climate control unit and solar radiation sensor

• Open circuit between climate control unit and air mix actuator

• Open circuit between climate control unit and airflow mode actuator

STEP

INSPECTION

ACTION

1

• Disconnect climate control unit connector

(24-pin) and airflow mode actuator
connector.

• Is there open circuit between terminal 1B of

climate control unit connector (24-pin) or
terminal B of airflow mode actuator
connector?

Yes

Repair wiring harness.

No

Go to next step.

2

• Is there short circuit to ground between

terminal 1B of climate control unit connector
(24-pin) and terminal B of airflow mode
actuator connector?

Yes

Repair wiring harness.

No

Go to next step.

3

• Is there short circuit to ground between

terminal 1B of climate control unit connector
(24-pin) and terminal B of air mix actuator
connector?

Yes

Repair wiring harness.

No

Go to next step.

4

• Is there short circuit to ground between

terminal 1B of climate control unit connector
(24-pin) and terminal A of solar radiation
sensor connector?

Yes

Repair wiring harness.

No

This system is normal at present. (Erase the past failure
from memory.)