Mazda CX-9 Grand Touring. Manual — part 345

NO.26 EXHAUST SULPHUR SMELL [MZI-3.7]S

NO.26 EXHAUST SULPHUR SMELL (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE
CAUSES

DIAGNOSTIC PROCEDURE

NO.26 EXHAUST SULPHUR SMELL (MZI-3.7) DIAGNOSTIC PROCEDURE

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

26

EXHAUST SULPHUR SMELL

DESCRIPTION Rotten egg smell (sulphur) from exhaust

POSSIBLE

CAUSE



Electrical connectors are disconnected or connected poorly



Charcoal canister malfunction



Vacuum lines are disconnected or connected improperly.



Improper fuel pressure



Poor fuel quality

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

Are any driveability or exhaust
smoke concerns present?

Yes

Go to the appropriate flow chart.

No

Go to the next step.

Inspect 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

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© 2005 Mitchell Repair Information Company, LLC.

NO.27 FUEL REFILL CONCERNS [MZI-3.7]

2



Electrical connections



Vacuum lines



Fuel quality

Are all items normal?

Yes

Go to the next step.

No

Service if necessary.

Repeat Step 2.

3

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.

4

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

Yes

Go to the next step.

No

Low:

Inspect fuel pump relay and fuel pump circuit.

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] .)

5

Inspect the charcoal canister for
fuel saturation.
Is excess amount of liquid fuel
present in canister?

Yes

Replace the charcoal canister.

No

Inspect the fuel tank vent system.

If the fuel tank vent system is normal, suggest trying

a different brand since sulphur content can vary in

different fuels.

If the fuel tank vent system is not normal, repair or

replace the malfunctioning part.

6



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 10:10:06 AM

Page 87

© 2005 Mitchell Repair Information Company, LLC.

NO.27 FUEL REFILL CONCERNS (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

DIAGNOSTIC PROCEDURE

NO.27 FUEL REFILL CONCERNS (MZI-3.7) DIAGNOSTIC PROCEDURE

27

FUEL REFILL CONCERNS

DESCRIPTION



Fuel tank is not filled smoothly.

POSSIBLE

CAUSE



Clogged EVAP pipes



Nonreturn valve malfunction



Improper use of fuel nozzle



Inadequate fuel filling speed

WARNING:



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

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.

Yes

Inspect for the following:



Improper use of fuel nozzle

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 88

© 2005 Mitchell Repair Information Company, LLC.

NO.28 FUEL FILLING SHUT OFF CONCERNS [MZI-3.7]

NO.28 FUEL FILLING SHUT OFF CONCERNS (MZI-3.7) DETECTION CONDITIONS AND
POSSIBLE CAUSES

2

Remove the fuel-filler pipe.
Make sure the nonreturn valve is installed
properly.
Inspect nonreturn valve operation.
Is the nonreturn valve normal?



Inadequate fuel filling speed

No

Nonreturn valve is installed improperly:



Reinstall nonreturn valve to proper

position.

Nonreturn valve does not operate

properly:



Replace nonreturn valve.

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.

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

28

FUEL FILLING SHUT OFF CONCERNS

DESCRIPTION



Fuel does not shut off properly.



Clogged EVAP pipes



Nonreturn valve malfunction



Fuel shut-off valve malfunction



Fuel nozzle malfunction



Fuel nozzle is not inserted correctly.

WARNING:



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



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

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 89

© 2005 Mitchell Repair Information Company, LLC.