DIAGNOSTIC PROCEDURE
DTC P1450 (MZI-3.5) DIAGNOSTIC PROCEDURE
CONDITION
z
P1450 indicates the Self-Test has detected that the EVAP system is unable
to bleed up fuel tank vacuum.
POSSIBLE CAUSE
z
Blockages or kinks in the charcoal canister tube or purge solenoid valve
outlet tube (between fuel tank, CV solenoid valve and charcoal canister).
z
Fuel filler cap is stuck closed (no vacuum relief).
z
Contaminated fuel vapor elbow on charcoal canister.
z
Restricted charcoal canister.
z
CV solenoid valve stuck open (partially or fully).
z
Plugged CV solenoid valve filter.
z
CV solenoid valve is stuck open.
z
Power supply open (wiring harness near Fuel tank pressure sensor, Fuel tank
pressure sensor or PCM).
z
Fuel tank pressure sensor malfunction
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA
HAS BEEN RECORDED
z
Has FREEZE FRAME DATA
been recorded?
Yes
Go to the next step.
No
Record FREEZE FRAME DATA on the
repair order, then go to the next step.
2
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
z
Verify related Service Bulletins
and/or on-line repair information
availability.
z
Is any related Service Bulletins
available?
Yes
Perform repair or diagnosis according to
the available Service Bulletins.
z
If the vehicle is not repaired, go to
the next step.
No
Go to the next step.
3
VERIFY RELATED PENDING
CODE OR STORED DTCs
z
Turn the ignition switch off then
to the ON position (Engine off).
z
Verify related pending code or
stored DTCs.
z
Are other DTCs present?
Yes
Go to the appropriate DTC
troubleshooting.
(See
DTC TABLE [MZI-3.5]
.)
No
Go to the next step.
4
INSPECT FOR VISUAL CAUSES
OF EXCESSIVE FUEL TANK
VACUUM
Yes
Remove any contamination or foreign
material around fuel vapor hoses and
tubes.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:26:37 AM
Page 363
© 2005 Mitchell Repair Information Company, LLC.