Mazda CX-9 Grand Touring. Manual - part 274

DTC P0461 [MZI-3.7] 

DTC P0461 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

DIAGNOSTIC PROCEDURE 

DTC P0461 (MZI-3.7) DIAGNOSTIC PROCEDURE 



Is other DTCs present?  

5

VERIFY TROUBLESHOOTING OF 
DTC P0460 HAS BEEN COMPLETED 



Verify that all disconnected 
connectors reconnected.  



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



Perform the "KOEO/KOER self-
test". (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] .)

No

Go to the next step.

6

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].)

No

Troubleshooting completed.

DTC P0461

Fuel gauge sender unit range/performance problem

DETECTION 

CONDITION 



The PCM monitors the fuel level input communications network message for a 
concern. The test fails when the fuel level input signal repeatedly moves in and 
out of range, exceeding the minimum or maximum allowable calibrated 
parameters for a specified fuel fill percentage in the fuel tank.  

POSSIBLE 

CAUSE 



Excessive electrical noise  



Fuel level input signal circuit malfunction  

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.

VERIFY REPAIR INFORMATION 

 

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 229 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0462 [MZI-3.7] 

2

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.  



Is other DTCs present?  

Yes

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

No

Go to the next step.

5

VERIFY TROUBLESHOOTING OF 
DTC P0461 HAS BEEN COMPLETED 



Verify that all disconnected 
connectors reconnected.  



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



Perform the "KOEO/KOER self-
test". (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] .)

No

Go to the next step.

6

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].)

No

Troubleshooting completed.

 

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 230 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0462 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

DIAGNOSTIC PROCEDURE 

DTC P0462 (MZI-3.7) DIAGNOSTIC PROCEDURE 

DTC P0462

Fuel gauge sender unit circuit low input

DETECTION 

CONDITION 



The PCM) monitors the fuel level input communications network message for 
a concern. The test fails if the fuel level input signal is less than the minimum 
allowable calibrated parameter for a specified fuel-fill percentage in the fuel 
tank.  

POSSIBLE 

CAUSE 



Empty fuel tank  



Fuel pump malfunction  



Incorrectly installed fuel gauge  



Instrument cluster malfunction  



Fuel gauge malfunction  



Fuel level input signal circuit malfunction  

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 

Yes

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

 

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 231 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0463 [MZI-3.7] 

DTC P0463 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

DIAGNOSTIC PROCEDURE 

DTC P0463 (MZI-3.7) DIAGNOSTIC PROCEDURE 

cluster.  



Is other DTCs present?  

No

Go to the next step.

5

VERIFY TROUBLESHOOTING OF 
DTC P0462 HAS BEEN COMPLETED 



Verify that all disconnected 
connectors reconnected.  



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



Perform the "KOEO/KOER self-
test". (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] .)

No

Go to the next step.

6

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].)

No

Troubleshooting completed.

DTC P0463

Fuel gauge sender unit circuit high input

DETECTION 

CONDITION 



The PCM monitors the fuel level input communications network message-for a 
concern. The test fails if the fuel level input signal is more than the maximum 
allowable calibrated parameter for a specified fuel-fill percentage in the fuel 
tank.  

POSSIBLE 

CAUSE 



Fuel pump malfunction  



Incorrectly installed fuel gauge  



Instrument cluster malfunction  



Fuel level input signal circuit malfunction  



Overfilled fuel tank  



Fuel gauge malfunction  

STEP

INSPECTION

ACTION

 

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 232 

© 2005 Mitchell Repair Information Company, LLC.