DTC P0453 [MZI-3.7]
DTC P0453 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
6
z
Perform the fuel tank pressure sensor
inspection. (See
FUEL TANK
PRESSURE SENSOR
INSPECTION [MZI-3.7]
.)
z
Is the fuel tank pressure sensor
normal?
No
Replace the evaporative hose component, then go
to the next step. (See
FUEL TANK
REMOVAL/INSTALLATION [MZI-3.7]
.)
7
VERIFY TROUBLESHOOTING OF
DTC P0452 COMPLETED
z
Make sure to reconnect all
disconnected connectors.
z
Turn ignition switch to the ON
position (Engine off).
z
Clear the DTC from the PCM
memory using the M-MDS.
z
Start the engine and warm it up
completely.
z
Is same DTC present?
Yes
Replace the PCM, then go to the next step. (See
PCM REMOVAL/INSTALLATION [MZI-
3.7]
.)
No
Go to the next step.
8
VERIFY AFTER REPAIR
PROCEDURE
z
Perform the "After Repair
Procedure". (See
AFTER REPAIR
PROCEDURE [MZI-3.7]
.)
z
Are any DTCs present?
Yes
Go to the applicable DTC inspection. (See
DTC
TABLE [MZI-3.7]
.)
No
Troubleshooting completed.
DTC P0453
Fuel tank pressure sensor high input
DETECTION
CONDITION
z
The PCM monitors the evaporative emission (EVAP) control system fuel tank
pressure sensor input signal to the PCM. The test fails when the signal average
jumps above a minimum allowable calibrated parameter.
POSSIBLE
CAUSE
z
Fuel tank pressure sensor malfunction
z
Connector or terminal malfunction
z
Open circuit between fuel tank pressure sensor terminal A and PCM terminal 1AB
z
Open circuit between fuel tank pressure sensor terminal B and PCM terminal 1AL
z
Short to the constant voltage supply circuit between fuel tank pressure sensor
terminal A and PCM terminal 1AB
z
Short to power supply between fuel tank pressure sensor terminal C and PCM
terminal 1U
z
Fuel tank pressure sensor power circuit and signal circuit are shorted each other
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:38 AM
Page 217
© 2005 Mitchell Repair Information Company, LLC.
