Mazda CX-9 Grand Touring 2009 Manual page 1076

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
DTC P0451 [MZI-3.7]
DTC P0451 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
DTC P0451 Fuel tank pressure sensor range/performance
NOTE:
DETECTION
CONDITION
POSSIBLE
CAUSE
DIAGNOSTIC PROCEDURE
DTC P0451 (MZI-3.7) DIAGNOSTIC PROCEDURE
STEP INSPECTION
VERIFY FREEZE FRAME DATA
HAS BEEN RECORDED
1
Has the 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 repair information
available?
VERIFY RELATED PENDING CODE
OR STORED DTCs
3
Turn the ignition switch off then to
the ON position (Engine off).
Verify related pending code or
stored DTCs.
2008 Mazda CX-9 Grand Touring
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.
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.
Intermittent open or short in the fuel tank pressure sensor or the fuel tank
pressure sensor signal
Fuel tank pressure sensor malfunction
Connector or terminal malfunction
PCM malfunction
Yes Go to the next step.
Record FREEZE FRAME DATA on the repair
No
order, then go to the next step.
Perform the repair or diagnosis according to the
available repair information.
Yes
If the vehicle is not repaired, go to the next
step.
No Go to the next step.
Go to the appropriate DTC troubleshooting. (See
Yes
DTC TABLE [MZI-3.7].)
No Go to the next step.
ACTION