Mazda CX-9 Grand Touring 2009 Manual page 1369

(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
2 canister.
Inspect for blockage in fuel tank vent
system.
Is malfunction indicated?
Inspect the purge solenoid valve.
(See PURGE SOLENOID VALVE
3
INSPECTION [MZI-3.7] .)
Is the solenoid operating properly?
Connect the M-MDS to the DLC-2.
Turn the ignition switch to the ON
4 position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
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
5
Information and perform repair or diagnosis.
NO.21 ENGINE NOISE [MZI-3.7]
NO.21 ENGINE NOISE (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
21 ENGINE NOISE
DESCRIPTION Engine noise from under hood
Squeal, click or chirp noise:
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
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] .)
Improper engine oil level
Improper drive belt tension
Yes Replace vacuum hose.
No
Yes Go to the next step.
Replace the purge solenoid valve.
(See PURGE SOLENOID VALVE
No
REMOVAL/INSTALLATION [MZI-
DTC is displayed:
Yes Go to the appropriate DTC inspection.
(See DTC TABLE [MZI-3.7] .)
No DTC is displayed:
Inspect charcoal canister for fuel saturation.
No
If excess amount of liquid fuel is present,
replace the charcoal canister.
Go to the next step.
3.7] .)