Mazda CX-9 Grand Touring. Manual — part 442

10



Are the piping connections
free of oil grime? (Visual
inspection)



Are the piping connections
free of gas leakage?



Are the piping installation
points on the condenser free
of gas leakage?



Are the piping installation
points on the receiver/drier
free of gas leakage?



Are the piping installation
points on the A/C
compressor free of gas
leakage?



Are the piping installation
points on the A/C unit free of
gas leakage?



Perform gas leakage
inspection using a gas leak
tester.



Are the above items normal?

No

If the piping or A/C component (s) are damaged or

cracked, replace them.

Then go to Step 20.

If there is no damage, go to Step 13.

11

INSPECT EVAPORATOR PIPING
CONNECTION IN A/C UNIT FOR
GAS LEAKAGE



Are piping the connections for the
evaporator in the A/C unit free of
gas leakage?

Yes

If the vane makes a noise, add 10 ml {10 cc, 0.34 fl
oz} of compressor oil to the A/C compressor.
Verify that the noise is no longer heard.
Adjust refrigerant to the specified amount, then go
to Step 20.

No

If the piping is damaged or cracked, replace it.

Then go to Step 20.

If there is no damage, go to the next step.

12

INSPECT EVAPORATOR PIPING
CONNECTION IN A/C UNIT FOR
LOOSE



Are the piping connections for the
evaporator in the A/C unit loose?

Yes

Tighten the connections to the specified torque,
adjust both compressor oil and refrigerant to the
specified amount, then go to Step 20.

No

If the vane makes a noise, add 10 ml {10 cc, 0.34 fl

oz} of compressor oil to the A/C compressor.

Verify that the noise is no longer heard.

Replace the O-ring on piping, adjust refrigerant to

the specified amount, then go to Step 20.

13

INSPECT PIPING CONNECTION
FOR LOOSE



Are the piping connections loose?

Yes

Tighten the connections to the specified torque,
adjust both compressor oil and refrigerant to the
specified amount, then go to Step 20.

No

If the vane makes a noise, add 10 ml {10 cc, 0.34 fl

oz} of compressor oil to the A/C compressor.

Verify that the noise is no longer heard.

2008 Mazda CX-9 Grand Touring

2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:14:51 AM

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© 2005 Mitchell Repair Information Company, LLC.

Replace O-ring on piping, adjust refrigerant to

specified amount, then go to Step 20.

14

INSPECT TO SEE WHETHER
MALFUNCTION IS IN EXPANSION
VALVE, AIR MIX ACTUATOR AND
COMPRESSOR OIL OR
ELSEWHERE



Does the refrigerant high-pressure
value hardly increase?

Yes Go to the next step. (Pressure hardly increases.)

No

Go to Step 17.

15

INSPECT TO SEE WHETHER
MALFUNCTION IS IN
COMPRESSOR OIL AMOUNT AND
A/C COMPRESSOR OR
ELSEWHERE



When the engine is racing, does the
high-pressure value increase?

Yes Return to Step 3.

No

Go to the next step.

16

INSPECT TO SEE WHETHER
MALFUNCTION IS IN
COMPRESSOR OIL AMOUNT OR
A/C COMPRESSOR



After compressor oil is replenished
each 10 ml {10 cc, 0.34 fl oz} ,
does high-pressure value increase?

Yes

Troubleshooting completed. (Explain to customer
that cause was insufficient compressor oil.)

No

Replace the A/C compressor, then go to Step 20.

(Cause is defective A/C compressor.)

17

INSPECT TO SEE WHETHER
MALFUNCTION IS IN EXPANSION
VALVE OR ELSEWHERE



Is only refrigerant low-pressure
value high?

Yes Go to Step 19.

No

Go to the next step.

VERIFY THAT AIR MIX IS
INSTALLED SECURELY AND
PROPERLY

Yes

Set the fan switch to 4th position.
Turn the A/C switch on.
Set FRESH mode.
Set temperature control to MAX COLD.
Set VENT mode.

1. Start and run the engine at 1,500 rpm for 10

min.

2. Run the engine at idle for 1 min.

3. Within 12 s, idle -> 4,000 rpm -> idle.

Perform cycle 5 times.

4. Run the engine at idle for 30 s.

5. Drain the compressor oil completely from the

2008 Mazda CX-9 Grand Touring

2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:14:51 AM

Page 25

© 2005 Mitchell Repair Information Company, LLC.

NO.9 NO COOL AIR FROM FRONT/REAR VENTS

NO.9 NO COOL AIR FROM FRONT/REAR VENTS DESCRIPTION AND POSSIBLE CAUSE

18



Are the front (driver and passenger
side) and rear A/C unit air mix
links, air mix cranks, and air mix
rods securely and properly
installed?

A/C compressor and verify the amount.



If there is approx. 90 ml {90 cc, 3.0 fl oz} of
compressor oil, go to Step 20.



If there is more than 90 ml {90 cc, 3.0 fl oz}
of compressor oil, remove surplus oil and fill
the A/C compressor with 90 ml {90 cc, 3.0 fl
oz} of compressor oil. Repeat Steps (1) to
(5).

(Cause is excessive amount of compressor oil.)

No

Repair or install the links, cranks and rods securely

in the proper position, then go to Step 20.

19

VERIFY THAT EXPANSION VALVE
HEAT-SENSING TUBE WITHIN A/C
UNIT IS POSITIONED SECURELY
AND CORRECTLY



Is the expansion valve heat-sensing
tube in the A/C unit securely
installed in the proper position?

Yes

Replace the expansion valve, then go to the next
step. (Since the valve opens too much, replacement
is necessary.)

No

Install the heat-sensing tube securely in the proper

position, then go to the next step.

20

VERIFY THAT MALFUNCTION
SYMPTOM OCCURS AFTER
REPAIR



Does cool air blow out? (Are
results of refrigerant system
performance test normal?)

Yes

Troubleshooting completed.
Explain repairs to customer.

No

Recheck malfunction symptoms, then repeat from

Step 1 if the malfunction recurs.

9

No cool air from front/rear vents

DESCRIPTION



Malfunction in A/C compressor control system



Magnetic clutch does not operate when the A/C system is turned ON.

POSSIBLE CAUSE



Malfunction in PCM A/C cut control system



Malfunction in climate control unit



Malfunction in refrigerant pressure switch



Malfunction in PCM (A/C signal)



Malfunction in PCM (IG1 signal)



Malfunction in A/C compressor

2008 Mazda CX-9 Grand Touring

2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:14:51 AM

Page 26

© 2005 Mitchell Repair Information Company, LLC.



When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors
while performing the inspection to discover whether poor contact points are the cause of any intermittent
malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harnesses are
connected correctly and undamaged.

DIAGNOSTIC PROCEDURE

NO.9 NO COOL AIR FROM FRONT/REAR VENTS DIAGNOSTIC PROCEDURE



Malfunction in A/C relay



Malfunction in evaporator temperature sensor



Malfunction in BCM unit

STEP

INSPECTION

ACTION

1

INSPECT AIR FLOW FROM VENTS



Does air blow out?

Yes Go to the next step.

No

Go to Step 1 of troubleshooting indexes

No.1 and 2.

2

INSPECT A/C COMPRESSOR OPERATION



Start engine.



Turn A/C switch and fan switch on.



Does A/C compressor operate?

Yes

Go to Step 1 of troubleshooting index
No.7.

No

Go to the next step.

3

INSPECT FOR DTC IN PCM



Inspect for DTCs related to the PCM onboard
diagnostic system.



Are any DTCs displayed?

Yes Go to appropriate inspection procedure.

No

Go to the next step.

4

INSPECT TO SEE WHETHER
MALFUNCTION IS IN CLIMATE CONTROL
UNIT OR ELSEWHERE



Does cool air blow out when terminal 1S of
climate control unit connector (24-pin, A/C
signal) is grounded?

Yes

Replace climate control unit, then go to
Step 16.

No

Release short, then go to the next step.

5*

INSPECT TO SEE WHETHER
MALFUNCTION IS IN A/C SIGNAL
CIRCUIT (BETWEEN REFRIGERANT
PRESSURE SWITCH AND PCM) OR
ELSEWHERE



Test voltage at following terminal of
refrigerant pressure switch.



Terminal B (A/C signal)



Is voltage approx. 12 V?

Yes Go to Step 7.

No

Go to the next step.

2008 Mazda CX-9 Grand Touring

2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:14:51 AM

Page 27

© 2005 Mitchell Repair Information Company, LLC.