DTC P0451 [MZI-3.5]
DTC P0451 (MZI-3.5) DETECTION CONDITION AND POSSIBLE CAUSES
DIAGNOSTIC PROCEDURE
DTC P0451 (MZI-3.5) DIAGNOSTIC PROCEDURE
z
Perform the "AFTER REPAIR
PROCEDURE".
(See
AFTER REPAIR
PROCEDURE [MZI-3.5]
.)
z
Are any DTCs present?
No
Troubleshooting completed.
DTC P0451
Fuel tank pressure sensor range/performance
DETECTION
CONDITION
z
The fuel tank pressure changes more than 14 inches of water in 0.10 s. Fuel
tank pressure sensor output is offset by + /- 1.7 inches of water.
NOTE:
z
For some vehicle applications, DTC P0451 is set for a fuel tank pressure
sensor range (offset) concern. The DTC P0454 replaces the original
P0451 for intermittent (noisy) sensor concerns. Until the phase in
process is complete, noisy or offset fuel tank pressure sensor concerns
may set DTC P0451.
POSSIBLE CAUSE
z
Intermittent open or short in the fuel tank pressure sensor or the fuel tank
pressure sensor signal
z
Fuel tank pressure sensor malfunction
z
Connector or terminal malfunction
z
PCM malfunction
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA
HAS BEEN RECORDED
z
Has the 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 repair information
Yes
Perform the repair or diagnosis according
to the available repair information.
z
If the vehicle is not repaired, go to
the next step.
No
Go to the next step.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:26:33 AM
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© 2005 Mitchell Repair Information Company, LLC.