Mazda CX-9 Grand Touring. Manual - part 273



Press STOP (#4) on M-MDS 
tester to open the EVMV.  



Does the pressure drop 
immediately?  

7

INSPECT FOR 
MALFUNCTIONING CV 
SOLENOID VALVE OR FUEL 
TANK PRESSURE SENSOR  



Were both P0455 and P1443 
present at Step 1?  

Yes

Replace the CV solenoid valve. 
(See CHARCOAL CANISTER, CANISTER 
VENT (CV) SOLENOID VALVE, AIR FILTER 
COMPONENT REMOVAL/INSTALLATION 
[MZI-3.7] .) .) Go to the next step.

No

Replace the evaporative hose component. 

(See FUEL TANK REMOVAL/INSTALLATION 

[MZI-3.7] .) 

Go to the next step.

8

EVAP SYSTEM LEAK TEST  



Connect all disconnected 
connectors and hoses.  



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



Are the test results normal?  

Yes Go to the next step.

No

Leakage still exists. Locate leak point and repair. 

Repeat this step.

9

VERIFY TROUBLESHOOTING OF 
DTC P0455 HAS BEEN 
COMPLETED  



Verify that all disconnected 
connectors are reconnected.  



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



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



Start the engine and run it at idle. 



Retrieve DTCs using the M-
MDS.  



Is the PENDING CODE for this 
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.

10

VERIFY AFTER REPAIR 
PROCEDURE  



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

Yes

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

 

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 225 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0457 [MZI-3.7] 

DTC P0457 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

DIAGNOSTIC PROCEDURE 

DTC P0457 (MZI-3.7) DIAGNOSTIC PROCEDURE 



Are any DTC present?  

No

Troubleshooting completed.

DTC P0457

Evaporative emission system leak detected (fuel cap loose/off)

DETECTION 

CONDITION 



P0457 indicates that the initial vacuum could not be achieved after a 
refueling event and the purge vapor flow is excessive (gross leak).  

POSSIBLE CAUSE 



Missing or loose fuel filler cap.  

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS 
BEEN RECORDED  



Has 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  



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.  

No

Go to the next step.

3

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? 

NOTE:



If DTC P0455 is present, 
diagnose that DTC first. (See 
ENGINE CONTROL SYSTEM 
OPERATION INSPECTION 
[MZI-3.7] .)  

Yes

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

No

Go to the next step.

INSPECT FOR MISSING OR 

 

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 226 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0460 [MZI-3.7] 

DTC P0460 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

4

LEAKING FUEL FILLER CAP  



Check for missing or loose fuel filler 
cap.  



Check for possible cross-threaded 
fuel filler cap.  



Is a concern present?  

Yes

Repair or replace if necessary. Go to the next 
step.

No

Go to Step 6.

5

EVAP SYSTEM LEAK TEST  



Perform the EVAP system leak test. 
(See ENGINE CONTROL 
SYSTEM OPERATION 
INSPECTION [MZI-3.7] .)  



Are the test results normal?  

Yes Go to Step 6.

No

Leakage still exists. Go to the P0455 

Troubleshooting. (See ENGINE CONTROL 

SYSTEM OPERATION INSPECTION [MZI-

3.7] .)

6

VERIFY TROUBLESHOOTING OF 
DTC P0457 HAS BEEN COMPLETED 



Verify that all disconnected 
connectors are reconnected.  



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



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



Start the engine and run it at idle.  



Retrieve DTCs using the M-MDS.  



Is the PENDING CODE for this 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.

7

VERIFY AFTER REPAIR 
PROCEDURE  



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



Are any DTC present?  

Yes

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

No

Troubleshooting completed.

DTC P0460

Fuel level sensor circuit

DETECTION 

CONDITION 



The PCM monitors the fuel level input communications network message for a 
concern. The test fails when the PCM determines that the value of the fuel level 
input signal is stuck. The PCM calculates the amount of fuel used during 

 

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 227 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC P0460 (MZI-3.7) DIAGNOSTIC PROCEDURE 

operation. If the fuel level input signal does not change or does not correspond 
with the calculated fuel usage, the DTC is set.  

POSSIBLE 

CAUSE 



Empty fuel tank  



Fuel pump malfunction  



Incorrectly installed fuel gauge  



Instrument cluster malfunction  



Fuel level input signal circuit malfunction  



Overfilled fuel tank  



Fuel gauge malfunction  



Stuck float arm  

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA 
HAS BEEN RECORDED  



Has FREEZE FRAME DATA been 
recorded?  

Yes Go to the next step.

No

Record the FREEZE FRAME DATA on the repair 

order, then go to the next step.

2

VERIFY REPAIR INFORMATION 
AVAILABILITY  



Verify related Service Bulletins 
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.

No

Go to the next step.

3

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.  



Is other DTCs present?  

Yes

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

No

Go to the next step.

4

VERIFY STORED DTC IN 
INSTRUMENT CLUSTER  



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



Verify stored DTCs in instrument 
cluster.  

Yes

Go to the appropriate DTC inspection. (See DTC 
TABLE [INSTRUMENT CLUSTER] .)

No

Go to the next step.

 

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 228 

© 2005 Mitchell Repair Information Company, LLC.