Mazda CX-9 Grand Touring. Manual - part 344

 

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Mazda CX-9 Grand Touring. Manual - part 344

 

 

DIAGNOSTIC PROCEDURE 

NO.23 A/C DOES NOT WORK SUFFICIENTLY (MZI-3.7) DIAGNOSTIC PROCEDURE 

POSSIBLE 

CAUSE 

Open the A/C magnetic clutch  

Open circuit in wiring harness between A/C relay and A/C magnetic clutch  

Poor GND of A/C magnetic clutch  

Refrigerant pressure switch is stuck open.  

A/C relay is stuck open.  

Seized A/C compressor  

Open circuit in wiring harness between A/C switch and PCM through both 
refrigerant pressure switch and A/C amplifier  

STEP

INSPECTION

RESULTS

ACTION

1

Connect the M-MDS to the DLC-
2. 
Turn the ignition switch to the 
ON position (Engine off). 
Retrieve any DTCs. 
Are there any DTCs displayed?

Yes

DTC is displayed:  
Go to the appropriate DTC inspection. 
(See DTC TABLE [MZI-3.7] .)

No

No DTC is displayed:  

Go to the next step.

2

Disconnect A/C compressor 
connector. 
Start engine and turn A/C switch 
on. 
Is there correct voltage at A/C 
compressor magnetic clutch 
terminal? 
Specification  
10.5 V or more 

Yes

Inspect for GND condition of magnetic clutch on 
A/C compressor. 
If GND condition is normal, inspect for open circuit 
magnetic clutch coil.

No

Go to the next step.

3

Disconnect refrigerant pressure 
switch connector. 
Connect jumper wiring between 
A/C high pressure switch 
terminal. 
Connect jumper wiring between 
refrigerant pressure switch 
terminal. 
Turn the ignition switch to the 
ON position. 
Turn A/C switch on and set 
blower fan to any speed. 
Does A/C work?

Yes

Inspect refrigerant pressure switch operation. 
If switch is normal, go to the next step.

No

Inspect for the following: 

A/C switch is stuck open.  

Open circuit in wiring harness between 

refrigerant pressure switch and PCM terminal 

1R  

Open circuit in wiring harness between 

blower motor fan switch and resistor (if 

blower motor does not operate)  

Evaporator temperature sensor and A/C 

amplifier  

Remove jumper wiring from the 
switch connector. 

Yes

Inspect whether A/C relay is stuck open. 
Replace if necessary.

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:10:06 AM

Page 82 

© 2005 Mitchell Repair Information Company, LLC. 

NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY 
[MZI-3.7] 

NO.24 A/C ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY (MZI-3.7) DETECTION 
CONDITIONS AND POSSIBLE CAUSES
 

DIAGNOSTIC PROCEDURE 

NO.24 A/C ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY (MZI-3.7) DIAGNOSTIC 
PROCEDURE
 

4

Reconnect connector to 
refrigerant pressure switch. 
Start the engine and turn the A/C 
switch on. 
Does the fan operate?

No

Inspect the following and repair or replace if 

necessary: 

Refrigerant charging amount  

A/C compressor for seizure  

5

Verify test results. 

If normal, return to diagnostic index to service any additional symptoms. 

(See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7].) 

If malfunction remains, inspect related Service Bulletins and/or On-line Repair 
Information and perform repair or diagnosis. 

If vehicle is repaired, troubleshooting completed.  

If vehicle is not repaired or additional diagnostic information is not available, 
replace the PCM. 

(See PCM REMOVAL/INSTALLATION [MZI-3.7] .) 

24

A/C IS ALWAYS ON OR A/C COMPRESSOR RUNS CONTINUOUSLY.

DESCRIPTION 

A/C compressor magnetic clutch does not disengage.

POSSIBLE CAUSE 

A/C compressor magnetic clutch engagement is stuck.  

A/C relay is stuck closed.  

Short to GND in wiring harness between A/C switch and PCM  

Short to GND in wiring harness between A/C relay and PCM  

Short circuit to battery power in A/C relay to magnetic clutch  

STEP

INSPECTION

RESULTS

ACTION

1

Connect the M-MDS to the DLC-2. 
Turn the ignition switch to the ON position 
(Engine off). 
Retrieve any DTCs. 
Are there any DTCs displayed?

Yes

DTC is displayed:  
Go to the appropriate DTC inspection.
(See DTC TABLE [MZI-3.7] .)

No

No DTC is displayed:  

Go to the next step.

Inspect for the following: 

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:10:06 AM

Page 83 

© 2005 Mitchell Repair Information Company, LLC. 

2

Start the engine and idle it. 
Turn the A/C switch on. 
Remove the A/C relay. 
Does the A/C magnetic clutch disengage?

Yes

A/C relay is stuck closed.  

Short to GND in wiring harness 
between A/C relay and PCM 
terminal 1N.  

 
If both items normal, go to the next 
step.

No

Inspect if circuit between the A/C 

relay and magnetic clutch shorts to 

battery power circuit. 

If the circuit is normal, inspect the 

magnetic clutch for stuck engagement 

or clearance.

3

Disconnect refrigerant pressure switch 
connector. 
Start the engine and turn A/C switch on. 

 
Does the A/C remain working?

NOTE:

A/C should not work when 
disconnecting connector. If A/C 
remains working, short to GND circuit 
may be present.  

Yes

Inspect for short to GND in wiring 
harness between refrigerant pressure 
switch and PCM terminal 1R.

No

Go to the next step.

4

Reconnect refrigerant pressure switch 
connector. 
Turn off A/C switch. 

 
Does A/C remain working?

NOTE:

A/C should not work when turning A/C 
switch off. If A/C remains working, 
short to GND circuit may be present.  

Yes

Inspect following: 

Short to GND in wiring harness 
between A/C switch and A/C 
amplifier  

Short to GND circuit between 
A/C amplifier and refrigerant 
pressure switch  

No

Inspect whether A/C switch is stuck 

closed.

5

Verify test results. 

If normal, return to diagnostic index to service any additional symptoms. 

(See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7].) 

If malfunction remains, inspect related Service Bulletins and/or On-line Repair 
Information and perform repair or diagnosis. 

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:10:06 AM

Page 84 

© 2005 Mitchell Repair Information Company, LLC. 

NO.25 A/C DOES NOT CUT OFF UNDER WIDE OPEN THROTTLE 
CONDITIONS [MZI-3.7] 

NO.25 A/C DOES NOT CUT OFF UNDER WIDE OPEN THROTTLE CONDITIONS (MZI-3.7) 
DETECTION CONDITIONS AND POSSIBLE CAUSES
 

DIAGNOSTIC PROCEDURE 

NO.25 A/C DOES NOT CUT OFF UNDER WIDE OPEN THROTTLE CONDITIONS (MZI-3.7) 
DETECTION CONDITIONS AND POSSIBLE CAUSES
 

If vehicle is repaired, troubleshooting completed.  

If vehicle is not repaired or additional diagnostic information is not available, 
replace the PCM. 

(See PCM REMOVAL/INSTALLATION [MZI-3.7] .) 

25

A/C DOES NOT CUT OFF UNDER WOT CONDITIONS.

DESCRIPTION 

A/C compressor magnetic clutch does not disengage under WOT.

POSSIBLE CAUSE 

Accelerator pedal position sensor malfunction  

Accelerator pedal position sensor misadjustment  

Loosely installed accelerator pedal position sensor  

STEP

INSPECTION

RESULTS

ACTION

1

Does A/C compressor 
disengage when the A/C switch 
is turned off?

Yes

Go to the next step.

No

Go to symptom troubleshooting "NO.24 A/C IS 

ALWAYS ON OR A/C COMPRESSOR RUNS 

CONTINUOUSLY".

2

Connect the M-MDS to the 
DLC-2. 
Turn the ignition switch to the 
ON position (Engine off). 
Retrieve any DTCs. 
Are there any DTCs displayed?

Yes

DTC is displayed:  
Go to the appropriate DTC inspection. 
(See DTC TABLE [MZI-3.7] .)

No

No DTC is displayed:  

Inspect accelerator pedal position sensor.

3

Verify test results. 

If normal, return to diagnostic index to service any additional symptoms. 

(See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7].) 

If malfunction remains, inspect related Service Bulletins and/or On-line Repair 
Information and perform repair or diagnosis. 

If vehicle is repaired, troubleshooting completed.  

If vehicle is not repaired or additional diagnostic information is not available, 
replace the PCM. 

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:10:06 AM

Page 85 

© 2005 Mitchell Repair Information Company, LLC. 

 

 

 

 

 

 

 

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