Mazda CX-9 Grand Touring 2009 Manual page 1199

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
DTC P1450 Unable to bleed up fuel tank vacuum
DETECTION
CONDITION
POSSIBLE CAUSE
DIAGNOSTIC PROCEDURE
DTC P1450 (MZI-3.7) DIAGNOSTIC PROCEDURE
STEP INSPECTION
VERIFY FREEZE FRAME DATA
HAS BEEN RECORDED
1
Has FREEZE FRAME DATA been
recorded?
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
Verify related Service Bulletins
2
and/or on-line repair information
availability.
Is any related Service Bulletins
available?
VERIFY RELATED PENDING CODE
OR STORED DTCs
Turn the ignition switch off then to
3
the ON position (Engine off).
Verify related pending code or
stored DTCs.
Are other DTCs present?
INSPECT FOR VISUAL CAUSES OF
EXCESSIVE FUEL TANK VACUUM
2008 Mazda CX-9 Grand Touring
P1450 indicates the Self-Test has detected that the EVAP system is unable to
bleed up fuel tank vacuum.
Blockages or kinks in the charcoal canister tube or purge solenoid valve
outlet tube (between fuel tank, CV solenoid valve and charcoal canister).
Fuel filler cap is stuck closed (no vacuum relief).
Contaminated fuel vapor elbow on charcoal canister.
Restricted charcoal canister.
CV solenoid valve stuck open (partially or fully).
Plugged CV solenoid valve filter.
CV solenoid valve is stuck open.
Power supply open (wiring harness near Fuel tank pressure sensor, Fuel tank
pressure sensor or PCM).
Fuel tank pressure sensor malfunction
Yes Go to the next step.
No
Yes
No
Yes
No
ACTION
Record FREEZE FRAME DATA on the repair
order, then go to the next step.
Perform repair or diagnosis according to the
available Service Bulletins.
If the vehicle is not repaired, go to the next
step.
Go to the next step.
Go to the appropriate DTC troubleshooting. (See
DTC TABLE [MZI-3.7].)
Go to the next step.