DIAGNOSTIC PROCEDURE
DTC P1450 (MZI-3.7) DIAGNOSTIC PROCEDURE
DTC P1450
Unable to bleed up fuel tank vacuum
DETECTION
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-3.7]
.)
No
Go to the next step.
INSPECT FOR VISUAL CAUSES OF
EXCESSIVE FUEL TANK VACUUM
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:41 AM
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© 2005 Mitchell Repair Information Company, LLC.
