Mazda 6. Manual — part 388

U–56

ON-BOARD DIAGNOSTIC

*

: Shown on the information display according to step.

End Of Sie

DTC 02

A6E857001038W02

Diagnostic Procedure

End Of Sie

DTC 06

A6E857001038W03

3

Airflow mode
actuator operation

3

• Blower motor speed

— 3rd

• Air mix actuator operation

— 50%

• Air intake actuator operation

— FRESH

• A/C compressor operation

— ON

4

Air intake actuator
operation

4

• Blower motor speed

— 3rd

• Air mix actuator operation

— 0%

• Airflow mode actuator operation

— VENT

A/C compressor
operation

Step Operating device

Operating conditions

Moni

tor

*

Other device conditions

DTC 02

Solar radiation sensor system inspection

POSSIBLE

CAUSE

• Solar radiation sensor malfunction

• Climate control unit malfunction

• Open or short circuit between solar radiation sensor and climate control unit

STEP

INSPECTION

ACTION

1

• Inspect solar radiation sensor.

• Is it okay?

Yes

Go to next step.

No

Replace solar radiation sensor.

2

• Disconnect climate control unit connector

(24-pin) and solar radiation sensor
connector.

• Is there continuity between following

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

Yes

Go to next step.

No

Repair wiring harness.

3

• Is there short circuit to ground between

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

Yes

Repair wiring harness.

No

Replace climate control unit.

DTC 06

Cabin temperature sensor system inspection

POSSIBLE

CAUSE

• Cabin temperature sensor malfunction

• Climate control unit malfunction

• Open or short circuit between cabin temperature sensor and climate control unit

ON-BOARD DIAGNOSTIC

U–57

U

Diagnostic Procedure

End Of Sie

DTC 07

A6E857001038W04

Diagnostic Procedure

End Of Sie

DTC 10

A6E857001038W05

Diagnostic Procedure

End Of Sie

DTC 11

A6E857001038W06

STEP

INSPECTION

ACTION

1

• Is resistance between terminals 1I and 1M of

climate control unit connector (24-pin) as
indicated below?
— 137 ohms—220 kilohms

Yes

Replace climate control unit.

No

Go to next step.

2

• Inspect cabin temperature sensor.

• Is it okay?

Yes

Repair wiring harness.

No

Replace cabin temperature sensor.

DTC 07

Cabin temperature sensor system inspection

POSSIBLE

CAUSE

• Cabin temperature sensor malfunction

• Climate control unit malfunction

• Open or short circuit between cabin temperature sensor and climate control unit

STEP

INSPECTION

ACTION

1

• Inspect cabin temperature sensor.

• Is it okay?

Yes

Go to next step.

No

Replace cabin temperature sensor.

2

• Disconnect climate control unit connector

(24-pin) and cabin temperature sensor
connector.

• Is there open circuit between the following

terminals of climate control unit connector
(24-pin) and cabin temperature sensor
connector?
— 1I—A
— 1M—B

Yes

Repair wiring harness.

No

Go to next step.

3

• Is there short circuit to ground between

terminal 1M of climate control unit connector
(24-pin) and B of cabin temperature sensor
connector?

Yes

Repair wiring harness.

No

Connect climate control unit connector, then go to next step.

4

• Turn the ignition switch to ON position.

• Measure voltage at terminal the following

terminal 1M of climate control unit connector
(24-pin).

• Is voltage approximately 5V?

Yes

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

No

Replace climate control unit.

DTC 10

Evaporator temperature sensor system inspection

POSSIBLE

CAUSE

• Evaporator temperature sensor malfunction

• Climate control unit malfunction

• Open or short circuit between evaporator temperature sensor and climate control unit

STEP

INSPECTION

ACTION

1

• Is resistance between terminals 1I and 1Q of

climate control unit connector (24-pin) as
indicated below?
— 128 ohms—179 kilohms

Yes

Replace climate control unit.

No

Go to next step.

2

• Inspect evaporator temperature sensor.

• Is it okay?

Yes

Repair wiring harness.

No

Replace evaporator temperature sensor.

DTC 11

Evaporator temperature sensor system inspection

POSSIBLE

CAUSE

• Evaporator temperature sensor malfunction

• Climate control unit malfunction

• Open or short circuit between evaporator temperature sensor and climate control unit

U–58

ON-BOARD DIAGNOSTIC

Diagnostic Procedure

End Of Sie

DTC 12

A6E857001038W07

Diagnostic Procedure

End Of Sie

DTC 13

A6E857001038W08

Diagnostic Procedure

STEP

INSPECTION

ACTION

1

• Inspect evaporator temperature sensor.

• Is it okay?

Yes

Go to next step.

No

Replace evaporator temperature sensor.

2

• Disconnect climate control unit connector

(24-pin) and evaporator temperature sensor
connector.

• Is there open circuit between following

terminals of climate control unit connector
(24-pin) and evaporator temperature sensor
connector?
— 1Q—B
— 1I—A

Yes

Repair wiring harness.

No

Go to next step.

3

• Is there short circuit to ground between

terminal 1Q of climate control unit connector
(24-pin) and terminal B of evaporator
temperature sensor connector?

Yes

Repair wiring harness.

No

Connect climate control unit connector, then go to next step.

4

• Turn ignition switch to ON position.

• Measure voltage at terminal 1Q of climate

control unit connector (24-pin).

• Is voltage approximately 5 V?

Yes

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

No

Replace climate control unit.

DTC 12

Ambient temperature sensor system inspection

POSSIBLE

CAUSE

• Ambient temperature sensor malfunction

• Climate control unit malfunction

• Open or short circuit between ambient temperature sensor and climate control unit

STEP

INSPECTION

ACTION

1

• Is resistance between terminals 1I and 1K of

climate control unit connector (24-pin) as
indicated below?
— 122 ohms—182 kilohms

Yes

Replace climate control unit.

No

Go to next step.

2

• Inspect ambient temperature sensor.

• Is it okay?

Yes

Repair wiring harness.

No

Replace ambient temperature sensor.

DTC 13

Ambient temperature sensor system inspection

POSSIBLE

CAUSE

• Ambient temperature sensor malfunction

• Climate control unit malfunction

• Open or short circuit between ambient temperature sensor and climate control unit

STEP

INSPECTION

ACTION

1

• Inspect ambient temperature sensor.

• Is it okay?

Yes

Go to next step.

No

Replace ambient temperature sensor.

2

• Disconnect climate control unit connector

(24-pin) and ambient temperature sensor
connector.

• Is there open circuit between following

terminals of climate control unit connector
(24-pin) and ambient temperature sensor
connector?
— 1K—B
— 1I—A

Yes

Repair wiring harness.

No

Go to next step.

3

• Is there short circuit to ground between

terminal 1K of climate control unit connector
(24-pin) and terminal B of ambient
temperature sensor connector?

Yes

Repair wiring harness.

No

Connect climate control unit connector, then go to next step.

ON-BOARD DIAGNOSTIC

U–59

U

End Of Sie

DTC 14

A6E857001038W09

Diagnostic Procedure

End Of Sie

DTC 15

A6E857001038W10

Diagnostic Procedure

End Of Sie

DTC 18

A6E857001038W11

Diagnostic Procedure

4

• Turn ignition switch to ON position.

• Measure voltage at terminal 1K of climate

control unit connector (24-pin).

• Is voltage approximately 5 V?

Yes

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

No

Replace climate control unit.

STEP

INSPECTION

ACTION

DTC 14

Water temperature sensor system inspection

POSSIBLE

CAUSE

• Water temperature sensor malfunction

• Climate control unit malfunction

• Open or short circuit between water temperature sensor and climate control unit

STEP

INSPECTION

ACTION

1

• Is resistance between terminals 1I and 1O of

climate control unit connector (24-pin) as
indicated below?

• 112 ohms—110 kilohms

Yes

Replace climate control unit.

No

Go to next step.

2

• Inspect water temperature sensor.

• Is it okay?

Yes

Repair wiring harness.

No

Replace water temperature sensor.

DTC 15

Water temperature sensor system inspection

POSSIBLE

CAUSE

• Water temperature sensor malfunction

• Climate control unit malfunction

• Open or short circuit between water temperature sensor and climate control unit

STEP

INSPECTION

ACTION

1

• Is water temperature sensor normal?

Yes

Go to next step.

No

Replace water temperature sensor.

2

• Disconnect climate control unit connector

(24-pin) and water temperature sensor
connector.

• Is there open circuit between following

terminals of climate control unit connector
(24-pin) and water temperature sensor
connector?
— 1O—A
— 1I—B

Yes

Repair wiring harness.

No

Go to next step.

3

• Is there short circuit to ground between

terminal 1O of climate control unit connector
(24-pin) and terminal A of water temperature
sensor connector?

Yes

Repair wiring harness.

No

Connect climate control unit connector and go to next step.

4

• Turn the ignition switch to ON position.

• Is voltage at terminal 1O of climate control

unit connector (24-pin) above 5 V?

Yes

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

No

Replace climate control unit.

DTC 18

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.