Mazda CX-9 Grand Touring 2009 Manual page 1081

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Perform the fuel tank pressure sensor
inspection. (See FUEL TANK
PRESSURE SENSOR
6
INSPECTION [MZI-3.7] .)
Is the fuel tank pressure sensor
normal?
VERIFY TROUBLESHOOTING OF
DTC P0452 COMPLETED
Make sure to reconnect all
disconnected connectors.
Turn ignition switch to the ON
7
position (Engine off).
Clear the DTC from the PCM
memory using the M-MDS.
Start the engine and warm it up
completely.
Is same DTC present?
VERIFY AFTER REPAIR
PROCEDURE
Perform the "After Repair
8
Procedure". (See AFTER REPAIR
PROCEDURE [MZI-3.7].)
Are any DTCs present?
DTC P0453 [MZI-3.7]
DTC P0453 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
DTC P0453 Fuel tank pressure sensor high input
DETECTION
CONDITION
POSSIBLE
CAUSE
2008 Mazda CX-9 Grand Touring
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.
Fuel tank pressure sensor malfunction
Connector or terminal malfunction
Open circuit between fuel tank pressure sensor terminal A and PCM terminal 1AB
Open circuit between fuel tank pressure sensor terminal B and PCM terminal 1AL
Short to the constant voltage supply circuit between fuel tank pressure sensor
terminal A and PCM terminal 1AB
Short to power supply between fuel tank pressure sensor terminal C and PCM
terminal 1U
Fuel tank pressure sensor power circuit and signal circuit are shorted each other
Replace the evaporative hose component, then go
No to the next step. (See FUEL TANK
REMOVAL/INSTALLATION [MZI-3.7] .)
Replace the PCM, then go to the next step. (See
Yes PCM REMOVAL/INSTALLATION [MZI-
3.7] .)
No Go to the next step.
Go to the applicable DTC inspection. (See DTC
Yes
TABLE [MZI-3.7].)
No Troubleshooting completed.