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Mazda CX-9 Grand Touring. Manual - part 272

DTC P0454 [MZI-3.7]

DTC P0454 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

DIAGNOSTIC PROCEDURE

DTC P0454 (MZI-3.7) DIAGNOSTIC PROCEDURE

memory using the M-MDS.



Start the engine and warm it up
completely.



Is same DTC present?

Go to the next step.

VERIFY AFTER REPAIR
PROCEDURE



Perform the "After Repair
Procedure". (See AFTER REPAIR
PROCEDURE [MZI-3.7].)



Are any DTCs present?

Yes

Go to the applicable DTC inspection. (See DTC
TABLE [MZI-3.7].)

Troubleshooting completed.

DTC P0454

Fuel tank pressure sensor intermittent

DETECTION

CONDITION



The fuel tank pressure changes more than 14 inches of water in 0.10 s.

POSSIBLE CAUSE



Intermittent open or short in the fuel tank pressure sensor or the fuel
tank pressure sensor signal



Fuel tank pressure sensor malfunction

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED



Has FREEZE FRAME DATA been
recorded?

Yes Go to the next step.

Record FREEZE FRAME DATA on the repair

order, then go to the next step.

VERIFY RELATED REPAIR
INFORMATION AVAILABILITY



Verify related Service Bulletins and/or
on-line repair information availability.



Is any related Service Bulletins
available?

Yes

Perform repair or diagnosis according to the
available Service Bulletins.



If the vehicle is not repaired, go to the
next step.

Go to the next step.

VERIFY RELATED PENDING CODE
OR STORED DTCs



Turn the ignition switch off then to the
ON position (Engine off).

Yes

Go to the appropriate DTC troubleshooting. (See
DTC TABLE [MZI-3.7].)

Perform the "INTERMITTENT CONCERN

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 221

DTC P0455 [MZI-3.7]

DTC P0455 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES



Verify related pending code or stored
DTCs.



Is other DTCs present?

TROUBLESHOOTING". Then go to the next

step.

VERIFY TROUBLESHOOTING OF
DTC P0454 HAS BEEN COMPLETED



Verify that all disconnected
connectors reconnected.



Clear the DTC from the PCM memory
using the M-MDS.



Perform the "KOEO or KOER self-
test" using the M-MDS.

(See KOEO/KOER SELF TEST
[MZI-3.7].)



Is the PENDING CODE for the DTC
present?

Yes

Replace the PCM, then go to the next step. (See
PCM REMOVAL/INSTALLATION [MZI-
3.7] .)

Go to the next step.

VERIFY AFTER REPAIR
PROCEDURE



Perform the "AFTER REPAIR
PROCEDURE". (See AFTER
REPAIR PROCEDURE [MZI-3.7].)



Are any DTCs present?

Yes

Go to the applicable DTC inspection. (See DTC
TABLE [MZI-3.7].)

Troubleshooting completed.

DTC P0455

Evaporative emission system leak detected (gross leak/no flow)

DETECTION

CONDITION



P0455 indicates that a substantial leak or blockage has been detected in the
EVAP system when there is - 1.74 kPa (PID FTP_H2O displays "-7.0") or less
vacuum for a 30 seconds evaluation time.

POSSIBLE

CAUSE



After-market EVAP hardware (such as fuel-filler cap) not conforming to
required specifications.



Disconnected or cracked fuel chopping timer tube, CV solenoid valve outlet
tube or EVAP return tube.



CV solenoid valve stuck closed



Damaged or missing fuel-filler cap.



Insufficient fuel-filler cap installation.



Loose fuel vapor hose/tube connections to EVAP system components.



Blockages or restrictions in fuel vapor hoses/tubes.

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 222

DIAGNOSTIC PROCEDURE

DTC P0455 (MZI-3.7) DIAGNOSTIC PROCEDURE



Rollover valve blocked or fuel shut-off valve.



CV solenoid valve stuck open.



Mechanically inoperative Fuel tank pressure sensor.



Damaged charcoal canister.

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA
HAS BEEN RECORDED



Has FREEZE FRAME DATA
been recorded?

Yes Go to the next step.

Record FREEZE FRAME DATA on the repair order,

then go to the next step.

VERIFY RELATED REPAIR
INFORMATION AVAILABILITY



Verify related Service Bulletins
and/or on-line repair information
availability.



Is any related Service Bulletins
available?

Yes

Perform repair or diagnosis according to the
available Service Bulletins.



If the vehicle is not repaired, go to the next
step.

Go to the next step.

VERIFY RELATED PENDING
CODE OR STORED DTCs



Turn the ignition switch off then
to the ON position (Engine off).



Verify related pending code or
stored DTCs.



Are other DTCs present?

Yes

Go to the appropriate DTC troubleshooting. (See
DTC TABLE [MZI-3.7].)

Go to the next step.

VISUALLY INSPECT FOR LARGE
EVAP SYSTEM LEAK



Check for the presence of a fuel-
filler cap. Do not tighten or check
for correct installation at this
time.



Verify that both the input port
vacuum hose and EVAP return
tube are attached to the CV
solenoid valve.



Verify that the CV solenoid valve
is properly attached to the
charcoal canister.

Yes

Repair or replace the EVAP components if
necessary. (See FUEL TANK INSPECTION
[MZI-3.7] .)
(See FUEL TANK PRESSURE SENSOR
INSPECTION [MZI-3.7] .)
(See CHARCOAL CANISTER, CANISTER
VENT (CV) SOLENOID VALVE, AIR FILTER

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 223



Visually inspect for disconnected
or cracked fuel vapor hoses/tubes
between the intake manifold and
the following components:



CV solenoid valve



Charcoal canister



Fuel shut-off valve



Check for damage to the fuel-
filler pipe and the fuel tank.



Is a concern visually evident?

COMPONENT REMOVAL/INSTALLATION
[MZI-3.7] .)
Go to Step 7.

Go to the next step.

INSPECT FOR EVAP SYSTEM
LEAKS



Disconnect the EVAP return tube
from the intake manifold and plug
the EVAP return tube.



Connect the EVAP System Leak
Tester to the EVAP test port.



Perform the EVAP System Leak
Test. (See ENGINE CONTROL
SYSTEM OPERATION
INSPECTION [MZI-3.7] .)



Does the pressure stay above 1.99
kPa (PID FTP_H2O displays
"8")?

Yes Go to the next step.

Verify that the fuel-filler cap is installed correctly.

Repair or install a new components if necessary. Go

to Step 8.

INSPECT FOR BLOCKAGE
BETWEEN CV SOLENOID VALVE
AND FUEL VAPOR HOSE JOINT



Turn the ignition switch to the
ON position (Engine off)



Using M-MDS tester, select the
Diagnostic Data Link.



Select the PCM.



Select the Active Command
Modes.



Select the Output Test Mode.



Close the CV solenoid valve
using the EVMV PID.



Pressurize the EVAP system to
3.48 kPa (PID FTP_H2O displays
"14").

Yes Go to the next step.

Replace the fuel tank vapor line(s). Go to Step 8.

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 224

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