Mazda CX-9 Grand Touring. Manual - part 342

 

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Mazda CX-9 Grand Touring. Manual - part 342

 

 

NO.19 EXHAUST SMOKE [MZI-3.7] 

NO.19 EXHAUST SMOKE (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

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

19

EXHAUST SMOKE

DESCRIPTION Blue, black, or white smoke from exhaust system

POSSIBLE 

CAUSE 

Blue smoke (Burning oil):  

PCV valve malfunction  

Engine internal oil leakage  

 
White smoke (Water in combustion):  

Cooling system malfunction (coolant loss)  

Engine internal coolant leakage  

 
Black smoke (Rich fuel mixture):  

Air cleaner restriction  

Intake-air system is collapsed or restricted.  

Fuel return line is restricted.  

Excessive fuel pressure  

Improper engine compression  

Injector fuel leakage  

Ignition system malfunction 

WARNING:

The following troubleshooting flow chart contains fuel system diagnosis and 
repair procedures. Read following warnings before servicing fuel system: 

Fuel vapor is hazardous. It can easily ignite, causing serious injury 
and damage. Always keep sparks and flames away from fuel.  

Fuel line spills and leakage are dangerous. Fuel can ignite and cause 
serious injuries or death and damage. Fuel can also irritate skin and 
eyes. To prevent this, always complete "BEFORE SERVICE 
PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this 
manual. 

(See BEFORE SERVICE PRECAUTION [MZI-3.7] .) 

(See AFTER SERVICE PRECAUTION [MZI-3.7] .) 

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:10:05 AM

Page 74 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

NO.19 EXHAUST SMOKE (MZI-3.7) DIAGNOSTIC PROCEDURE 

CAUTION:

Disconnecting/connecting quick release connector without cleaning it 
may cause damage to fuel pipe and quick release connector. Always 
clean quick release connector joint area before 
disconnecting/connecting, and make sure that it is free of foreign 
material.  

STEP

INSPECTION

RESULTS

ACTION

1

What color is smoke coming from 
the exhaust system?

Blue

Burning oil is indicated. 
Go to the next step.

White

Water in combustion is indicated. 

Go to Step 3.

Black

Rich fuel mixture is indicated. 
Go to Step 4.

2

Remove and shake the PCV 
valve. 
Does the PCV valve rattle?

Yes

Inspect for the following: 

Damaged valve guide, stems or valve seals  

Blocked oil drain passage in cylinder head  

Piston ring is not seated, seized or worn.  

Damaged cylinder bore  

 
If other driveability symptoms are present, return to 
diagnostic index to service any additional 
symptoms.

No

Replace the PCV valve.

3

Does the cooling system hold 
pressure?

Yes

Inspect for the following: 

Cylinder head gasket leakage  

Intake manifold gasket leakage  

Cracked or porous engine block  

 
If other driveability symptoms are present, return to 
diagnostic index to service any additional 
symptoms.

No

Inspect for cause.

Inspect for the following: 

Air cleaner restriction  

Yes

Go to the next step.

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:10:05 AM

Page 75 

© 2005 Mitchell Repair Information Company, LLC. 

NO.20 FUEL ODOR (IN ENGINE COMPARTMENT) [MZI-3.7] 

4

Collapsed or restricted 
intake-air system  

Restricted fuel return line  

 
Are all items normal?

No

Service if necessary. 

Repeat Step 4.

5

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.

6

Install the fuel pressure gauge 
between the fuel pipe and the fuel 
distributor. 
Start the engine and idle it. 
Measure fuel line pressure during 
idle. 
Is fuel line pressure correct during 
idle? 
(See FUEL LINE PRESSURE 
INSPECTION [MZI-3.7]
 .)

Yes

Go to the next step.

No

Low:  

Inspect the fuel line for clogging. 

If there is no malfunction, replace the fuel pump 

unit. 

(See FUEL PUMP UNIT 

REMOVAL/INSTALLATION [MZI-3.7] .) 

High:  

Replace the fuel pump unit. 

(See FUEL PUMP UNIT 

REMOVAL/INSTALLATION [MZI-3.7] .)

7

Perform the spark test. 
(See ENGINE CONTROL 
SYSTEM OPERATION 
INSPECTION [MZI-3.7]
.) 
Is strong blue spark visible at 
each cylinder?

Yes

Inspect the CMP sensor. 
(See CAMSHAFT POSITION (CMP) SENSOR 
INSPECTION [MZI-3.7]
 .)

No

Repair or replace the malfunctioning part according 

to spark test result.

8

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] .) 

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:10:05 AM

Page 76 

© 2005 Mitchell Repair Information Company, LLC. 

NO.20 FUEL ODOR (IN ENGINE COMPARTMENT) (MZI-3.7) DETECTION CONDITIONS AND 
POSSIBLE CAUSES
 

DIAGNOSTIC PROCEDURE 

NO.20 FUEL ODOR (IN ENGINE COMPARTMENT) (MZI-3.7) DIAGNOSTIC PROCEDURE 

20

FUEL ODOR (IN ENGINE COMPARTMENT)

DESCRIPTION Gasoline fuel smell or visible leakage

POSSIBLE 

CAUSE 

Excessive fuel pressure  

Purge solenoid valve malfunction  

Fuel tank vent system blockage  

Charcoal canister malfunction  

Fuel leakage from fuel system 

WARNING:

The following troubleshooting flow chart contains fuel system diagnosis and 
repair procedures. Read following warnings before servicing fuel system: 

Fuel vapor is hazardous. It can easily ignite, causing serious injury 
and damage. Always keep sparks and flames away from fuel.  

Fuel line spills and leakage are dangerous. Fuel can ignite and cause 
serious injuries or death and damage. Fuel can also irritate skin and 
eyes. To prevent this, always complete "BEFORE SERVICE 
PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this 
manual. 

(See BEFORE SERVICE PRECAUTION [MZI-3.7] .) 

(See AFTER SERVICE PRECAUTION [MZI-3.7] .) 

CAUTION:

Disconnecting/connecting quick release connector without cleaning it 
may cause damage to fuel pipe and quick release connector. Always 
clean quick release connector joint area before 
disconnecting/connecting, and make sure that it is free of foreign 
material.  

STEP

INSPECTION

RESULTS

ACTION

1

Visually inspect for fuel leakage at fuel 
injector O-ring and fuel line. 
Service if necessary. 
Install the fuel pressure gauge between the 
fuel pipe and the fuel distributor. 
Start engine and idle it. 
Measure fuel line pressure during idle. 
Is fuel line pressure correct during idle? 

Yes

Go to the next step.

No

Replace the fuel pump unit. 

(See FUEL PUMP UNIT 

REMOVAL/INSTALLATION [MZI-

3.7] .)

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:10:05 AM

Page 77 

© 2005 Mitchell Repair Information Company, LLC. 

 

 

 

 

 

 

 

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