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] .)
2
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.
No
Go to the next step.
3
Inspect the purge solenoid valve.
(See PURGE SOLENOID VALVE
INSPECTION [MZI-3.7] .)
Is the solenoid operating properly?
Yes
Go to the next step.
No
Replace the purge solenoid valve.
(See PURGE SOLENOID VALVE
REMOVAL/INSTALLATION [MZI-
3.7] .)
4
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 charcoal canister for fuel saturation.
If excess amount of liquid fuel is present,
replace the charcoal canister.
5
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] .)
21
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
© 2005 Mitchell Repair Information Company, LLC.
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
1
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
© 2005 Mitchell Repair Information Company, LLC.
NO.22 VIBRATION CONCERNS (ENGINE) [MZI-3.7]
Generator installation (alignment)
No
Go to the next step.
2
Is a rumbling or grinding
noise present?
Yes
Inspect for the followings:
Drive belt tension
P/S fluid level
No
Go to the next step.
3
Is a rattling noise present?
Yes
Inspect rattling location for loose parts.
No
Go to the next step.
4
Is a hissing noise present?
Yes
Inspect for the following:
Vacuum leakage
Spark plug looseness
Intake-air system leakage
No
Go to the next step.
5
Is a rapping or roar noise
present?
Yes
Inspect looseness for followings:
Dynamic dumper
Intake-air system
Exhaust system
No
Go to the next step.
6
Is a knocking noise present?
Yes
Go to symptom troubleshooting "No. 13
Knocking/pinging".
(See NO.13 KNOCKING/PINGING-
ACCELERATION/CRUISE [MZI-3.7].)
No
If the noise comes from the engine internal, inspect for
friction gear, timing chain or MLA noise.
7
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
© 2005 Mitchell Repair Information Company, LLC.
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
22
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
1
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
No
Readjust or retighten engine mount
installation position.
Service if necessary for other parts.
2
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] .)
23
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
Page 81
© 2005 Mitchell Repair Information Company, LLC.
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