Mazda CX-9 Grand Touring 2009 Manual page 1371

Is a rumbling or grinding
2
noise present?
3 Is a rattling noise present?
4 Is a hissing noise present?
Is a rapping or roar noise
5
present?
6 Is a knocking noise present?
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
7
Information and perform repair or diagnosis.
NO.22 VIBRATION CONCERNS (ENGINE) [MZI-3.7]
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
No
Inspect for the followings:
Yes
No
Yes Inspect rattling location for loose parts.
No
Inspect for the following:
Yes
No
Inspect looseness for followings:
Yes
No
Go to symptom troubleshooting "No. 13
Knocking/pinging".
Yes
(See NO.13 KNOCKING/PINGING-
ACCELERATION/CRUISE [MZI-3.7].)
If the noise comes from the engine internal, inspect for
No
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] .)
Generator installation (alignment)
Go to the next step.
Drive belt tension
P/S fluid level
Go to the next step.
Go to the next step.
Vacuum leakage
Spark plug looseness
Intake-air system leakage
Go to the next step.
Dynamic dumper
Intake-air system
Exhaust system
Go to the next step.
friction gear, timing chain or MLA noise.