Mazda CX-9 Grand Touring. Manual - part 343

NO.21 ENGINE NOISE [MZI-3.7]

NO.21 ENGINE NOISE (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

(See FUEL LINE PRESSURE
INSPECTION [MZI-3.7] .)

Inspect for blockage/restriction or open
circuit in wiring harness between the
engine vacuum port and the charcoal
canister.
Inspect for blockage in fuel tank vent
system.
Is malfunction indicated?

Yes

Replace vacuum hose.

Go to the next step.

Inspect the purge solenoid valve.
(See PURGE SOLENOID VALVE
INSPECTION [MZI-3.7] .)
Is the solenoid operating properly?

Yes

Go to the next step.

Replace the purge solenoid valve.

(See PURGE SOLENOID VALVE

REMOVAL/INSTALLATION [MZI-

3.7] .)

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 DTC is displayed:

Inspect charcoal canister for fuel saturation.

If excess amount of liquid fuel is present,

replace the charcoal canister.



Verify test results.



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

(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [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] .)

ENGINE NOISE

DESCRIPTION

Engine noise from under hood

Squeal, click or chirp noise:



Improper engine oil level



Improper drive belt tension

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 78

DIAGNOSTIC PROCEDURE

NO.21 ENGINE NOISE (MZI-3.7) DIAGNOSTIC PROCEDURE

POSSIBLE CAUSE



Generator installation (alignment)



Splash shield or under cover looseness (splashed water to drive belts)

Rattle sound noise:



Loose parts

Hiss sound noise:



vacuum leakage



Loose spark plug



Air leakage from intake-air system

Rumble or grind noise:



Improper drive belt tension



Improper P/S fluid level

Rap or roar noise:



Dynamic dumper looseness



Exhaust system looseness



Intake-air system looseness

Other noise:



Camshaft friction gear noise or MLA noise



Timing chain noise

STEP

INSPECTION

RESULTS

ACTION

Is a squealing, click or
chirping sound present?

Yes

Inspect for the followings:



Engine oil level



Drive belt tension



Splash shield or under cover looseness

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 79

NO.22 VIBRATION CONCERNS (ENGINE) [MZI-3.7]



Generator installation (alignment)

Go to the next step.

Is a rumbling or grinding
noise present?

Yes

Inspect for the followings:



Drive belt tension



P/S fluid level

Go to the next step.

Is a rattling noise present?

Yes

Inspect rattling location for loose parts.

Go to the next step.

Is a hissing noise present?

Yes

Inspect for the following:



Vacuum leakage



Spark plug looseness



Intake-air system leakage

Go to the next step.

Is a rapping or roar noise
present?

Yes

Inspect looseness for followings:



Dynamic dumper



Intake-air system



Exhaust system

Go to the next step.

Is a knocking noise present?

Yes

Go to symptom troubleshooting "No. 13
Knocking/pinging".
(See NO.13 KNOCKING/PINGING-
ACCELERATION/CRUISE [MZI-3.7].)

If the noise comes from the engine internal, inspect for

friction gear, timing chain or MLA noise.



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 80

NO.22 VIBRATION CONCERNS (ENGINE) (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE
CAUSES

DIAGNOSTIC PROCEDURE

NO.22 VIBRATION CONCERNS (ENGINE) (MZI-3.7) DIAGNOSTIC PROCEDURE

NO.23 A/C DOES NOT WORK SUFFICIENTLY [MZI-3.7]

NO.23 A/C DOES NOT WORK SUFFICIENTLY (MZI-3.7) DETECTION CONDITIONS AND
POSSIBLE CAUSES

VIBRATION CONCERNS (ENGINE)

DESCRIPTION



Vibration from under hood or driveline

POSSIBLE CAUSE



Loose attaching bolts or worn parts



Components malfunction such as worn parts

STEP

INSPECTION

RESULTS

ACTION

Inspect the following components for loose
attaching bolts or worn parts:



Cooling fan



Drive belt and pulleys



Generator



Engine mounts



Exhaust system mounts

All items normal?

Yes

Inspect the following systems:



Wheels



ATX



Driveline



Suspension

Readjust or retighten engine mount

installation position.

Service if necessary for other parts.



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] .)

A/C DOES NOT WORK SUFFICIENTLY.

DESCRIPTION A/C compressor magnetic clutch does not engage when the A/C switch is turned on.



Improper refrigerant charging amount

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

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