Mazda CX 7. Manual — part 282

SYMPTOM TROUBLESHOOTING

07-03–1

07-03

07-03

SYMPTOM TROUBLESHOOTING

HVAC SYSTEM WIRING DIAGRAM . . . . 07-03–2
FOREWORD . . . . . . . . . . . . . . . . . . . . . . 07-03–3
TROUBLESHOOTING INDEX. . . . . . . . . 07-03–4
NO.1 INSUFFICIENT AIR (OR NO AIR)

BLOWN FROM VENTS . . . . . . . . . . . . . 07-03–4

NO.2 AMOUNT OF AIR BLOWN FROM

VENTS DOES NOT CHANGE . . . . . . . . 07-03–5

Full-auto Air Conditioner . . . . . . . . . . . 07-03–5

NO.3 AMOUNT OF AIR BLOWN FROM

VENTS DOES NOT CHANGE . . . . . . . . 07-03–7

Manual Air Conditioner . . . . . . . . . . . . 07-03–7

NO.4 AIR INTAKE MODE DOES NOT

CHANGE. . . . . . . . . . . . . . . . . . . . . . . . . 07-03–7

NO.5 NO TEMPERATURE CONTROL

WITH CLIMATE CONTROL UNIT . . . . . 07-03–10

NO.6 WINDSHIELD FOGGED . . . . . . . . . 07-03–11
NO.7 AIR FROM VENTS NOT COLD

ENOUGH . . . . . . . . . . . . . . . . . . . . . . . . 07-03–13

NO.8 NO COOL AIR . . . . . . . . . . . . . . . . . 07-03–15
NO.9 NOISE WHILE OPERATING

A/C SYSTEM . . . . . . . . . . . . . . . . . . . . . 07-03–17

End of Toc

WM: HEATER, VENTILATION AND AIR CONDITIONING (HVAC)

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SYMPTOM TROUBLESHOOTING

07-03–2

HVAC SYSTEM WIRING DIAGRAM

id070300800100

Full-auto Air Conditioner

M

M

M

M

REFRIGERANT
PRESSURE
SWITCH

PCM

IG2 B+

CPU

AMBIENT
TEMPERATURE
SENSOR

PASSENGER
COMPARTMENT
TEMPERATURE
SENSOR

EVAPORATOR
TEMPERATURE
SENSOR

SOLAR RADIATION
SENSOR

TNS RELAY

POWER MOS FET

BLOWER RELAY

BLOWER MOTOR

AIR INTAKE
ACTUATOR

AIRFLOW MODE
ACTUATOR

AIR MIX
ACTUATOR

A/C RELAY

MAGNETIC
CLUTCH

CLIMATE CONTROL UNIT

B

A

A

Q

O

K

J

N

U

S

P

T

V

I

5 V

5 V

D

W

H

F

C

L

E

A

B

X

A

B

M

R

INSTRUMENT
CLUSTER

REAR
WINDOW
DEFROSTER
RELAY

G

AUTO SWITCH

AMB SWITCH

REC SWITCH

A/C SWITCH

OFF SWITCH

MODE SWITCH

DEFROSTER SWITCH

TEMPERATURE SETTING DIAL

AIRFLOW VOLUME CONTROL DIAL

REAR WINDOW DEFROSTER SWITCH

ALL CLIMATE CONTROL SWITCHES

INFORMATION
DISPLAY

CAN
SYSTEM-
RELATED
MODULE

5 V

acxuuw00002303

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SYMPTOM TROUBLESHOOTING

07-03–3

07-03

Manual Air Conditioner

End Of Sie

FOREWORD

id070300800200

• The areas for inspection (steps) are given according to various circuit malfunctions. Use the following chart to

verify the symptoms of the trouble in order to diagnose the appropriate area.

End Of Sie

D

F

A

C

D

E

A

B

A

D

B

C

A

F

E

D

L

IG2 B+

IG2

IG2 B+

M

C

J

X

V

K

W

I

H

R

F

P

B

A

B+

PCM

BLOWER RELAY

BLOWER MOTOR

RESISTOR

REFRIGERANT
PRESSURE
SWITCH

MAGNETIC
CLUTCH

A/C RELAY

TNS
RELAY

CLIMATE CONTROL UNIT

BCM

EVAPORATOR
TEMPERATURE
SENSOR

AIR INTAKE ACTUATOR

AMBIENT
TEMPERATURE
SENSOR

AIRFLOW MODE
ACTUATOR

M

M

G

S

Q

E

REAR
WINDOW

DEFROSTER
RELAY

A

A

B

D

C

A

A

B

B

A

D

F

B

C

INSTRUMENT
CLUSTER

E

A

D

C

C

D

A

E

B

A

E

D

AIRFLOW VOLUME
CONTROL DIAL

acxuuw00002304

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SYMPTOM TROUBLESHOOTING

07-03–4

TROUBLESHOOTING INDEX

id070300800300

End Of Sie

NO.1 INSUFFICIENT AIR (OR NO AIR) BLOWN FROM VENTS

id070300800400

Diagnostic procedure

No.

TROUBLESHOOTING ITEM

DESCRIPTION

1

Insufficient air (or no air) blown from vents

• Problem with each vent and/or duct

• Airflow mode does not change

2

Amount of air blown from vents does not change. (Full-

auto air conditioner)

• Malfunction in blower system

3

Amount of air blown from vents does not change. (Manual

air conditioner)

• Malfunction in blower system

4

Air intake mode does not change.

• Air intake mode does not change when switching

REC/FRESH mode.

5

No temperature control with climate control unit

• Malfunction in A/C unit and/or climate control unit

air intake system

6

Windshield fogged.

• A/C compressor does not operate while airflow

mode is in DEFROSTER or HEAT/DEF modes.

• Air intake mode does not change to FRESH while

airflow mode is in DEFROSTER or HEAT/DEF

modes.

7

Air from vents not cold enough

• Magnetic clutch operates but A/C system

malfunctions.

8

No cool air

• Magnetic clutch does not operate.

9

Noise while operating A/C system

• Noise from magnetic clutch, A/C compressor, hose

or refrigerant line

1

Insufficient air (or no air) blown from vents

DESCRIPTION

• Problem with each vent and/or duct.

• Airflow mode does not change.

POSSIBLE

CAUSE

• Malfunction in airflow mode actuator

• Malfunction in VENT mode system

• Malfunction in HEAT mode system

• Malfunction in DEFROSTER mode system

STEP

INSPECTION

ACTION

1

INSPECT AIRFLOW MODE ACTUATOR

• Inspect airflow mode actuator.

• Is it okay?

Yes

Go to the next step.

No

Repair or replace malfunctioning part in accordance with
further inspection result.

2

INSPECT TO SEE WHETHER MALFUNCTION
IS IN VENT MODE OR OTHER MODES

• Does air blow out when in the VENT mode?

Yes

Go to Step 5.

No

Go to the next step.

3

INSPECT VENT

• Is the vent clogged?

Yes

Remove obstruction, then go to Step 9.

No

Go to the next step.

4

VERIFY THAT DUCT IN DASHBOARD IS
INSTALLED

• Is the duct in the dashboard properly

installed?

Yes

Inspect the duct for clogging, deformation and air leakage,
then go to Step 9.

No

Install the duct securely in the proper position, then go to
Step 9.

5

INSPECT TO SEE WHETHER MALFUNCTION
IS IN HEAT MODE OR DEFROSTER MODE

• Does air blow out when in the HEAT mode?

Yes

Go to the next step.

No

Inspect the vent for clogging, then go to Step 9.

6

INSPECT DEFROSTER MODE

• Does air blow out when in the DEFROSTER

mode?

Yes

Operation is normal. Recheck malfunction symptoms.

No

Go to the next step.

7

INSPECT VENT

• Is the vent clogged?

Yes

Remove obstruction, then go to Step 9.

No

Go to the next step.

8

VERIFY THAT DEFROSTER DUCT IS
INSTALLED

• Is the defroster duct properly installed?

Yes

Inspect the duct for clogging, deformation, and air leakage,
then go to the next step.

No

Install the duct securely in proper position, then go to the
next step.

9

CONFIRM THAT MALFUNCTION SYMPTOM
DOES NOT RECUR AFTER REPAIR

• Does air blow out?

Yes

Troubleshooting completed.
Explain repairs to customer.

No

Recheck malfunction symptoms, then repeat from Step 1 if
the malfunction recurs.

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