Mazda CX 7. Manual — part 279

ON-BOARD DIAGNOSTIC

07-02–3

07-02

DTC B1251, B1253

id070200800300

Diagnostic Procedure

End Of Sie

DTC B1251,

B1253

Passenger compartment temperature sensor system

POSSIBLE

CAUSE

• Passenger compartment temperature sensor malfunction

• Open or short circuit in wiring harness between climate control unit and passenger compartment

temperature sensor

STEP

INSPECTION

ACTION

1

• Inspect the passenger compartment temperature

sensor. (See 07-40-23 PASSENGER
COMPARTMENT TEMPERATURE SENSOR
INSPECTION.)

• Is it normal?

Yes

Go to the next step.

No

Replace the passenger compartment temperature
sensor. (See 07-40-23 PASSENGER COMPARTMENT
TEMPERATURE SENSOR REMOVAL/
INSTALLATION.)

2

• Disconnect the climate control unit connector and

the passenger compartment temperature sensor
connector.

• Is there an open circuit in the wiring harness

between the following terminals of the climate
control unit and the passenger compartment
temperature sensor?

— H— B

— C— A

Yes

Repair the wiring harness.

No

Go to the next step.

3

• Is there a short circuit to ground in the wiring

harness between climate control unit terminal H
and passenger compartment temperature sensor
terminal B?

Yes

Repair the wiring harness.

No

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

4

• Turn the ignition switch to the ON position.

• Inspect the voltage at the following climate control

unit terminal (wiring harness-side).
— Terminal H (passenger compartment

temperature sensor input signal)

• Is the voltage normal? (Approx. 5 V)

Yes

The system is normal at present. (Clear the malfunction
from the memory.)

No

Inspect the connection of the climate control unit
connector. (See 07-40-13 CLIMATE CONTROL UNIT
INSPECTION [FULL-AUTO AIR CONDITIONER].)

CLIMATE CONTROL UNIT CONNECTOR

PASSENGER COMPARTMENT TEMPERATURE
SENSOR CONNECTOR

A

M

B

C

D

E

F

G

I

L

J

K

N

O

P

Q

R

S

T

U

V

W

X

A

B

H

1871-1U-06B(07-02).fm 3 ページ ２００６年３月１６日 木曜日 午後４時２２分

ON-BOARD DIAGNOSTIC

07-02–4

DTC B1251, B1253, B1255, B1257, B1274, B1275, B1282, B1283, B1947, B2014 (MULTIPLE DTCS
INDICATED)

id070200800400

Diagnostic Procedure

End Of Sie

DTC B1260, B1261

id070200800500

Diagnostic Procedure

End Of Sie

DTC B1251,

B1253, B1255,
B1257, B1947,
B2014, B1282,
B1283, B1274,

B1275

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

POSSIBLE

CAUSE

• Open circuit in wiring harnesses between climate control unit and each temperature sensor, air mix

actuator, or airflow mode actuator

STEP

INSPECTION

ACTION

1

• Disconnect the climate control unit connector and

the evaporator temperature sensor connector.

• Is there an open circuit in the wiring harness

between climate control unit terminal C and
evaporator temperature sensor terminal A?

Yes

Repair the wiring harness.

No

Inspect the connection of the climate control unit
connector.

CLIMATE CONTROL UNIT CONNECTOR

EVAPORATOR TEMPERATURE SENSOR CONNECTOR

A

M

B

C

D

E

F

G

I

L

J

K

N

O

P

Q

R

S

T

U

V

W

X

A

B

H

DTC B1260,

B1261

Solar radiation sensor system

POSSIBLE

CAUSE

• Solar radiation sensor malfunction

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

STEP

INSPECTION

ACTION

1

• Inspect the solar radiation sensor. (See 07-40-23

SOLAR RADIATION SENSOR INSPECTION.)

• Is it normal?

Yes

Go to the next step.

No

Replace the solar radiation sensor. (See 07-40-22
SOLAR RADIATION SENSOR REMOVAL/
INSTALLATION.)

2

• Disconnect the climate control unit connector and

the solar radiation sensor connector.

• Is there continuity between the following terminals

of the climate control unit and the solar radiation
sensor?

— E— B

— J— A

Yes

Go to the next step.

No

Repair the wiring harness.

3

• Is there a short circuit to ground in the wiring

harness between climate control unit terminal E
and solar radiation sensor terminal B?

Yes

Repair the wiring harness.

No

Inspect the connection of the climate control unit
connector. (See 07-40-13 CLIMATE CONTROL UNIT
INSPECTION [FULL-AUTO AIR CONDITIONER].)

CLIMATE CONTROL UNIT CONNECTOR

SOLAR RADIATION SENSOR CONNECTOR

A

M

B

C

D

E

F

G

I

L

J

K

N

O

P

Q

R

S

T

U

V

W

X

A

B

H

1871-1U-06B(07-02).fm 4 ページ ２００６年３月１６日 木曜日 午後４時２２分

ON-BOARD DIAGNOSTIC

07-02–5

07-02

DTC B1255, B1257

id070200800600

Diagnostic Procedure

End Of Sie

DTC B1255,

B1257

Ambient temperature sensor system

POSSIBLE

CAUSE

• Ambient temperature sensor malfunction

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

STEP

INSPECTION

ACTION

1

• Inspect the ambient temperature sensor. (See 07-

40-24 AMBIENT TEMPERATURE SENSOR
INSPECTION.)

• Is it normal?

Yes

Go to the next step.

No

Replace the ambient temperature sensor. (See 07-40-
24 AMBIENT TEMPERATURE SENSOR REMOVAL/
INSTALLATION.)

2

• Disconnect the climate control unit connector and

the ambient temperature sensor connector.

• Is there an open circuit in the wiring harness

between the following terminals of the climate
control unit and the ambient temperature sensor?
— L— B

— C— A

Yes

Repair the wiring harness.

No

Go to the next step.

3

• Is there a short circuit to ground in the wiring

harness between climate control unit terminal L
and ambient temperature sensor terminal B?

Yes

Repair the wiring harness.

No

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

4

• Turn the ignition switch to the ON position.

• Inspect the voltage at the following climate control

unit terminal (wiring harness-side).
— Terminal L (ambient temperature sensor input

signal)

• Is the voltage normal? (Approx. 5 V)

Yes

The system is normal at present. (Clear the malfunction
from the memory.)

No

Inspect the connection of the climate control unit
connector. (See 07-40-13 CLIMATE CONTROL UNIT
INSPECTION [FULL-AUTO AIR CONDITIONER].)

CLIMATE CONTROL UNIT CONNECTOR

AMBIENT TEMPERATURE SENSOR CONNECTOR

A

M

B

C

D

E

F

G

I

L

J

K

N

O

P

Q

R

S

T

U

V

W

X

A

B

H

1871-1U-06B(07-02).fm 5 ページ ２００６年３月１６日 木曜日 午後４時２２分

ON-BOARD DIAGNOSTIC

07-02–6

DTC B1260, B1261, B1274, B1275, B1282, B1283 (MULTIPLE DTCS INDICATED)

id070200800700

Diagnostic Procedure

End Of Sie

DTC B1260,

B1261, B1282,
B1283, B1274,

B1275

Climate control unit (+5 V power supply) system

POSSIBLE

CAUSE

• Open or short circuit in wiring harnesses between climate control unit and solar radiation sensor, air mix

actuator, or airflow mode actuator

STEP

INSPECTION

ACTION

1

• Disconnect the climate control unit connector and

the airflow mode actuator connector.

• Is there an open circuit in the wiring harness

between climate control unit terminal J and airflow
mode actuator terminal B?

Yes

Repair the wiring harness.

No

Go to the next step.

2

• Is there a short circuit to ground in the wiring

harness between climate control unit terminal J
and airflow mode actuator terminal B?

Yes

Repair the wiring harness.

No

Go to the next step.

3

• Is there a short circuit to ground in the wiring

harness between climate control unit terminal J
and air mix actuator terminal A?

Yes

Repair the wiring harness.

No

Go to the next step.

4

• Is there a short circuit to ground in the wiring

harness between climate control unit terminal J
and solar radiation sensor terminal A?

Yes

Repair the wiring harness.

No

The system is normal at present. (Clear the malfunction
from the memory.)

CLIMATE CONTROL UNIT CONNECTOR

AIR MIX ACTUATOR
CONNECTOR

AIRFLOW MODE
ACTUATOR CONNECTOR

SOLAR RADIATION
SENSOR CONNECTOR

A

M

B

C

D

E

F

G

I

L

J

K

N

O

P

Q

R

S

T

U

V

W

X

A

B

C

D

F

*

A

B

C

D

F

*

A

B

H

1871-1U-06B(07-02).fm 6 ページ ２００６年３月１６日 木曜日 午後４時２２分