Mazda CX 7. Manual — part 284

SYMPTOM TROUBLESHOOTING

07-03–9

07-03

End Of Sie

5

INSPECT TO SEE WHETHER MALFUNCTION
IS IN WIRING HARNESS (SHORT TO B+
BETWEEN CLIMATE CONTROL UNIT AND
AIR INTAKE ACTUATOR) OR ELSEWHERE

• Disconnect the climate control unit

connector.

• Measure the voltages at the following climate

control unit terminals.

(Auto A/C)

— Terminal K (FRESH motor drive signal)

— Terminal I (RECIRCULATE motor drive

signal)

(Manual A/C)

— Terminal X (FRESH motor drive signal)

— Terminal V (RECIRCULATE motor drive

signal)

• Are voltages approx. 0 V?

Yes

Go to the next step.

No

Repair the wiring harness between the climate control unit
and air intake actuator, then go to Step 9.

6

INSPECT TO SEE WHETHER MALFUNCTION
IS IN WIRING HARNESS (SHORT TO
GROUND BETWEEN CLIMATE CONTROL
UNIT AND AIR INTAKE ACTUATOR) OR
ELSEWHERE

• Turn the ignition switch to the LOCK position.

• Inspect for continuity at the following

terminals between the climate control unit
and ground.

(Auto A/C)

— Terminal K (FRESH motor drive signal)

— Terminal I (RECIRCULATE motor drive

signal)

(Manual A/C)

— Terminal X (FRESH motor drive signal)

— Terminal V (RECIRCULATE motor drive

signal)

• Is there continuity?

Yes

Repair the wiring harness between the climate control unit
and air intake actuator, then go to Step 9.

No

Go to the next step.

7

INSPECT AIR INTAKE LINK

• Inspect the air intake links.

— Is there grease on link?

— Are the links securely and properly

installed?

— Are the links free of obstructions and

hindrances?

• Are the above items normal?

Yes

Go to the next step.

No

Apply grease to the links. If any the links are damaged,
replace the air intake actuator, then go to Step 9.

8

INSPECT TO SEE WHETHER MALFUNCTION
IS IN CLIMATE CONTROL UNIT OR AIR
INTAKE DOOR

• Inspect the A/C unit air intake door.

— Is the door free of obstructions, cracks,

and damage?

— Are the doors securely and properly

installed?

• Are the above items normal?

Yes

Replace the climate control unit, then go to the next step.

No

Remove obstruction, or install the doors in the proper
position. If any doors are cracked or damaged, replace
them, then go to the next step.

9

CONFIRM THAT MALFUNCTION SYMPTOMS
DO NOT RECUR AFTER REPAIR

• Does the air intake mode change smoothly?

Yes

Troubleshooting completed. Explain repairs to customer.

No

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

STEP

INSPECTION

ACTION

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SYMPTOM TROUBLESHOOTING

07-03–10

NO.5 NO TEMPERATURE CONTROL WITH CLIMATE CONTROL UNIT

id070300800800

Diagnostic procedure

End Of Sie

5

No temperature control with climate control unit

DESCRIPTION

• Malfunction in A/C unit and/or climate control unit air intake system

POSSIBLE

CAUSE

• A/C unit air intake link, air intake crank, air intake rod, air intake wire, wire clamp malfunction

• Climate control unit rack-and-pinion, air intake wire malfunction

• A/C unit air intake door malfunction

• Heater piping malfunction

STEP

INSPECTION

ACTION

1

INSPECT COOLANT TEMPERATURE

• Is the coolant sufficiently warmed up?

Yes

Go to the next step.

No

Warm up the engine, then go to Step 8.

2

INSPECT A/C UNIT AIR INTAKE SYSTEM

• Inspect the A/C unit air intake links, air intake

cranks, air intake rods, air intake actuator,
and wire clamp.

— Is there grease on links and cranks?

— Are links, cranks, and rods securely

installed in their proper positions?

— Is wire clamp free of deformation?

• Are the above items normal?

Yes

Go to the next step.

No

Apply grease or install the links, cranks, and rods securely
in their proper positions, repair or replace the air intake
actuator or wire clamp, then go to Step 8.

3

VERIFY THAT AIR INTAKE WIRE FROM A/C
UNIT IS POSITIONED SECURELY AND
CORRECTLY (IF AVAILABLE)

• Is the air intake wire securely installed in the

correct position in relation to the A/C unit air
mix links?

Yes

Go to the next step.

No

Adjust the air intake wire or install securely in the correct
position, then go to Step 8.

4

INSPECT CLIMATE CONTROL UNIT

• Inspect the climate control unit.

• Is the climate control unit normal?

Yes

Go to the next step.

No

Repair or replace the climate control unit, then go to Step 8.

5

INSPECT A/C UNIT

• Is there any foreign material or obstruction in

the A/C unit air intake doors?

Yes

Remove obstruction, then go to Step 8.

No

Go to the next step.

6

INSPECT A/C UNIT AIR INTAKE DOOR

• Is the A/C unit air intake door securely and

properly installed?

Yes

Inspect the air intake door for cracks or damage, then go to
the next step.

No

Install the air intake door securely in the proper position,
then go to the next step.

7

INSPECT HEATER LINE

• Inspect the heater lines.

— Is the heater piping free of damage and

cracks?

— Are the heater piping connections free of

engine coolant leakage?

— Are the heater piping connections

securely tightened?

— Are the heater piping installation points on

A/C unit free of engine coolant leakage?

• Are the above items normal?

Yes

Operation is normal. Recheck malfunction symptoms.

No

If heater piping connections are loose, tighten the
connections to the specified torque.
Repair or replace the heater piping, then go to the next step.

8

VERIFY THAT MALFUNCTION SYMPTOM
OCCURS AFTER REPAIR

• Does the unit operate in every temperature

setting?

Yes

Troubleshooting completed.
Explain repairs to customer.

No

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

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SYMPTOM TROUBLESHOOTING

07-03–11

07-03

NO.6 WINDSHIELD FOGGED

id070300800900

• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while

doing the inspection to discover whether poor contact points are the cause of any intermittent malfunctions. If
there is a problem, inspect to make sure connectors, terminals and wiring harness are connected correctly and
undamaged.

Diagnostic procedure

6

Windshield fogged.

DESCRIPTION

• 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.

POSSIBLE

CAUSE

• Climate control unit (B+ signal) system malfunction

• Air intake actuator malfunction

• Climate control unit (RECIRCULATE, FRESH signal) system malfunction

• A/C unit air intake door malfunction

STEP

INSPECTION

ACTION

1

COOL AIR BLOW OUT INSPECTION

• When both the A/C and airflow volume

control dial in the climate control unit are on,
does cool air blow out from the front vent?

Yes

Go to the next step.

No

Go to Step 1 of troubleshooting index No.8.

2

INSPECT CLIMATE CONTROL UNIT POWER
SUPPLY FUSE FOR B+ SIGNAL

• Is the climate control unit power supply fuse

for B+ signal normal?

Yes

Go to the next step.

No

Inspect for a short to ground on blown fuse circuit.
Repair or replace if necessary. Install appropriate amperage
fuse.

3

INSPECT AIR INTAKE ACTUATOR

• Inspect the air intake actuator.

— Is there grease on the link?

— Is the link securely and properly

positioned?

— Is the link free of obstructions?

• Are the above items normal?

Yes

Go to the next step.

No

Apply grease or install the link properly and securely,
remove obstruction, then go to Step 14.

*4

INSPECT WIRING HARNESS BETWEEN
FUSE BLOCK AND CLIMATE CONTROL UNIT
FOR CONTINUITY

• Disconnect the climate control unit connector

(24-pin).

• Turn the ignition switch to the ON position.

• Measure the voltage at the following climate

control unit terminal (B+ signal).
— R (full-auto air conditioner)

— P (manual air conditioner)

• Is the voltage approx. 12 V?

Yes

Go to the next step.

No

Repair the wiring harness between the fuse block and
climate control unit, then go to Step 14.

*5

INSPECT WIRING HARNESS BETWEEN
CLIMATE CONTROL UNIT AND GROUND
FOR VOLTAGE

• Measure the voltage at the following climate

control unit terminal (Ground).

— D (full-auto air conditioner)

— L (manual air conditioner)

• Is the voltage approx. 0V?

Yes

Go to the next step.

No

Repair the wiring harness between the climate control unit
and ground, then go to Step 14.

6

VERIFY WHETHER MALFUNCTION IS IN A/C
UNIT AIR INTAKE DOOR OR ELSEWHERE

• Turn the ignition switch to the LOCK position.

• Connect the climate control unit connector

(24-pin).

• Remove the air intake actuator.

• Turn the ignition switch to the ON position.

• Set the airflow volume control dial to 4th

position.

• Does the air intake mode (RECIRCULATE,

FRESH) change smoothly when the air
intake link is operated by hand?

Yes

Go to the next step.

No

Go to Step 12.

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SYMPTOM TROUBLESHOOTING

07-03–12

End Of Sie

7

INSPECT AIR INTAKE ACTUATOR

• Inspect the air intake actuator.

(See 07-40-10 AIR INTAKE ACTUATOR
INSPECTION.)

• Is it normal?

Yes

Go to the next step.

No

Replace the air intake actuator, go to Step 14.

8

INSPECT AIR INTAKE SELECTOR SWITCH
AND DEFROSTER SWITCH IN CLIMATE
CONTROL UNIT
(Auto A/C)

• Measure the voltage at climate control unit

connector (24-pin) terminals K and I.

(Manual A/C)

• Measure the voltage at climate control unit

connector (24-pin) terminals X and V.

• Is it normal?

Yes

Go to the next step.

No

Replace the climate control unit, then go to Step 14.

*9

INSPECT WIRING HARNESS BETWEEN
CLIMATE CONTROL UNIT AND AIR INTAKE
ACTUATOR FOR CONTINUITY

• Turn the ignition switch to the LOCK position.

• Is there continuity between the following

climate control unit terminals and air intake
actuator terminals?

(Auto A/C)

— Terminal D — Terminal K (FRESH signal)

— Terminal F — Terminal I (RECIRCULATE

signal)

(Manual A/C)

— Terminal D — Terminal X (FRESH signal)

— Terminal F — Terminal V (RECIRCULATE

signal)

Yes

Go to the next step.

No

Repair the wiring harness between the climate control unit
and air intake actuator, then go to Step 14.

*10

INSPECT WIRING HARNESS BETWEEN
CLIMATE CONTROL UNIT AND AIR INTAKE
ACTUATOR FOR SHORT TO GROUND

• Is there continuity between the following

climate control unit terminals and ground?

(Auto A/C)

— Terminal K (FRESH signal)

— Terminal I (RECIRCULATE signal)

(Manual A/C)

— Terminal X (FRESH signal)

— Terminal V (RECIRCULATE signal)

Yes

Repair the wiring harness between the climate control unit
and air intake actuator, then go to Step 14.

No

Go to the next step.

*11

INSPECT WIRING HARNESS BETWEEN
CLIMATE CONTROL UNIT AND AIR INTAKE
ACTUATOR FOR SHORT TO B+

• Turn the ignition switch to the ON position

• Measure the voltage at the following climate

control unit terminals.

(Auto A/C)

— Terminal K (FRESH signal)

— Terminal I (RECIRCULATE signal)

(Manual A/C)

— Terminal X (FRESH signal)

— Terminal V (RECIRCULATE signal)

• Is the voltage approx. 12 V?

Yes

Repair the wiring harness between the climate control unit
and air intake actuator, then go to Step 14.

No

Replace the climate control unit, then go to Step 14.

12

INSPECT A/C UNIT AIR INTAKE DOOR

• Is there any foreign material or obstruction in

the A/C unit air intake door?

Yes

Remove obstruction, then go to Step 14.

No

Go to the next step.

13

VERIFY THAT A/C UNIT AIR INTAKE DOOR
IS POSITIONED SECURELY AND PROPERLY

• Is the A/C unit air intake door securely and

properly positioned?

Yes

Inspect the air intake door for cracks or damage, then go to
the next step.

No

Install the air intake door securely in the proper position,
then go to the next step.

14

VERIFY THAT MALFUNCTION SYMPTOM
OCCURS AFTER REPAIR

• Does the malfunction disappear?

Yes

Troubleshooting completed.
Explain repairs to customer.

No

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

STEP

INSPECTION

ACTION

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