Mazda CX-9 Grand Touring. Manual - part 354

ENGINE TUNE-UP PREPARATION 

1. Verify that the selector lever is in the P position.  

2. Connect the M-MDS to the DLC-2.  

3. Turn off the electrical loads.  

4. Verify that no DTCs are available.  

5. Warm up the engine as follows. 

1. Start the engine.  

2. Perform no-load racing at 2,500-3,000 rpm for 3 min. (ECT is approx. 80 °C {176 °F} or more)  

3. Release the accelerator pedal.  

4. Wait until the cooling fans stop. 

Fig. 2: Identifying DLC-2 Part Location 
Courtesy of MAZDA MOTORS CORP. 

IGNITION TIMING INSPECTION 

1. Perform "Engine Tune-up Preparation". (See ENGINE TUNE-UP PREPARATION.) 

2. Verify that the ignition timing (M-MDS: SPARKADV) is within the specification using M-MDS 

function. 

Ignition timing Approx. BTDC 13°  

3. Verify that ignition timing advances when the engine speed increases gradually. 

NOTE:



If the accelerator pedal is depressed continuously for a specified time, the 
engine speed may decrease to the idle speed. This is due to the fuel cut 
control operation, which prevents overheating, and it does not indicate a 
malfunction.  

NOTE:



The ignition timing cannot be adjusted.  



The M-MDS is required to verify the ignition timing. 

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Mechanical (MZI-3.7) - Mazda CX-9

  

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

If it is not within the specification, refer to "ENGINE SYMPTOM TROUBLESHOOTING". (See 
SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] .)  

IDLE SPEED INSPECTION 

1. Perform "Engine Tune-up Preparation". (See ENGINE TUNE-UP PREPARATION.) 

2. Verify that the idle speed (M-MDS: RPM) is within the specification using M-MDS. 

Idle speed (P position)  

No load: 570-670 rpm  

Electrical load on: 630-730 rpm  

Power steering oil pump operation: 600-700 rpm  

A/C and heater operation: 570-850 rpm [-40-49 °C {-40-120 °F}]  

IDLE MIXTURE INSPECTION 

1. Perform "Engine Tune-up Preparation". (See ENGINE TUNE-UP PREPARATION.)  

2. Verify that the idle speed and ignition timing are within the specification. (See IGNITION TIMING 

INSPECTION.) (See IDLE SPEED INSPECTION.)  

3. Insert an exhaust gas analyzer into the tailpipe.  

4. Verify that the CO and HC concentrations are within the specified regulation. 



If not within the regulation, refer to "ENGINE SYMPTOM TROUBLESHOOTING". (See 
SYMPTOM DIAGNOSTIC INDEX [MZI-3.7] .)  

Idle mixture  

HC concentration: Within the regulation  

CO concentration: Within the regulation  

DRIVE BELT INSPECTION [MZI-3.7] 

GENERATOR & A/C DRIVE BELT 

NOTE:



The idle speed cannot be adjusted.  



The M-MDS is required to verify the idle speed. 

NOTE:



The generator and A/C drive belt deflection/tension inspection is not 
necessary because of the use of the drive belt auto tensioner.  

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Mechanical (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:01:56 AM

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1. Verify that the drive belt auto tensioner indicator mark does not exceed the maximum belt length. 



If it exceeds the maximum belt length, replace the generator and A/C drive belt. (See DRIVE 
BELT REMOVAL/INSTALLATION [MZI-3.7].)  

2. Visually inspect the generator and A/C drive belt for damage and cracks. 



If there is generator and A/C drive belt damage and cracks, replace the generator and A/C drive 
belt. (See DRIVE BELT REMOVAL/INSTALLATION [MZI-3.7].) 

Fig. 3: Identifying Belt Length 
Courtesy of MAZDA MOTORS CORP. 

POWER STEERING OIL PUMP DRIVE BELT 

1. Visually inspect the power steering oil pump drive belt for damage and cracks. 



If there is power steering oil pump drive belt damage and cracks, replace the power steering oil 
pump drive belt. (See DRIVE BELT REMOVAL/INSTALLATION [MZI-3.7].)  

DRIVE BELT REMOVAL/INSTALLATION [MZI-3.7] 

GENERATOR & A/C DRIVE BELT 

1. Remove the engine cover. (See ENGINE COVER REMOVAL/INSTALLATION [MZI-3.7].) 

NOTE:



When removing the generator and A/C drive belt, perform the procedure 
with two people, one releasing the belt tension and the other removing the 
belt.  

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Mechanical (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

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2. Remove the front wheel and tire (RH). (See GENERAL PROCEDURES (SUSPENSION) .)  

3. Remove the splash shield (RH).  

4. Set a breaker bar on the center of the tensioner pulley as shown.  

5. Using the breaker bar, turn the center of the tensioner pulley clockwise to release the tension on the 

generator and A/C drive belt.  

6. Remove the generator and A/C drive belt.  

7. Install the generator and A/C drive belt. 

8. Verify that the drive belt auto tensioner indicator mark is within the maximum and minimum belt length. 

(See DRIVE BELT INSPECTION [MZI-3.7].) 



If the drive belt auto tensioner indicator mark is not within the limit, replace the generator and A/C 
drive belt.  

9. Install the splash shield (RH).  

10. Install the front wheel and tire (RH). (See GENERAL PROCEDURES (SUSPENSION) .)  

11. Install the engine cover. (See ENGINE COVER REMOVAL/INSTALLATION [MZI-3.7].) 

NOTE:



When the generator and A/C drive belt is replaced with a new one, the 
drive belt auto tensioner indicator mark is aligned with the nominal 
belt length mark. 

Fig. 4: Turning Center Of Tensioner Pulley 
Courtesy of MAZDA MOTORS CORP. 

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE Mechanical (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:01:56 AM

Page 6 

© 2005 Mitchell Repair Information Company, LLC.