Mazda CX-9 Grand Touring. Manual - part 321

1

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

Perform the PCM reprogramming procedure. 

(See PCM CONFIGURATION [MZI-3.7] .)

Then 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 the related PENDING CODE or 
stored DTCs using the M-MDS.  

Yes

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

No

Go to the next step.

4

IDENTIFY TRIGGER DTC FOR FREEZE 
FRAME DATA  



Is DTC P2270 or P2272 on the FREEZE 
FRAME DATA?  

Yes Go to the next step.

No

Go to the troubleshooting for the DTC on the 

FREEZE FRAME DATA. (See DTC TABLE 

[MZI-3.7].)

5

INSPECT FOR EXHAUST GAS 
LEAKAGE Visually inspect for exhaust gas 
leakage between the TWC and the rear 
HO2S.  



Is there any malfunction?  

Yes

Repair or replace the malfunctioning parts. 
Then go to the next step.

No

Go to the next step.

6

INSPECT REAR HO2S  



For DTC P02270 Inspect the rear HO2S
(RH)  



For DTC P02272 Inspect the rear HO2S
(LH) 

(See REAR HEATED OXYGEN 
SENSOR (HO2S) INSPECTION 
[MZI-3.7] .) 



Is there any malfunction?  

Yes

Repair or replace the malfunctioning parts. 
Then go to the next step.

No

Go to the next step.

VERIFY TROUBLESHOOTING OF DTC 
P2270, P2272 HAS BEEN COMPLETED  

 

2008 Mazda CX-9 Grand Touring 

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9

  

Microsoft 

 

Sunday, November 15, 2009 10:08:43 AM

Page 417 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P2271, P2273 [MZI-3.7] 

DTC P2271, P2273 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

DIAGNOSTIC PROCEDURE 

DTC P2271, P2273 (MZI-3.7) DIAGNOSTIC PROCEDURE 

7



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.  



Perform no load racing at the engine 
speed of 2,500-3,500 rpm for 60s or 
more, then idle the engine for 60s or 
more.  



Perform the KOEO and KOER self-test. 



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.

8

VERIFY AFTER REPAIR PROCEDURE 



Perform "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 P2271

P2271: Rear HO2S (RH) signal stuck rich

DTC P2273

P2273: Rear HO2S (LH) signal stuck rich

DETECTION 

CONDITION 



The downstream HO2S is forced rich and monitored by the PCM. The test 
fails if the PCM does not detect the output of the HO2S in a calibrated 
amount of time.  

POSSIBLE CAUSE 



Rear HO2S 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 FREEZE FRAME DATA on the repair 

order, then 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 10:08:43 AM

Page 418 

© 2005 Mitchell Repair Information Company, LLC. 

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

Perform the PCM reprogramming procedure. (See 

PCM CONFIGURATION [MZI-3.7] .) 

Then 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 the related PENDING 
CODE or stored DTCs using the M-
MDS.  

Yes

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

No

Go to the next step.

4

IDENTIFY TRIGGER DTC FOR 
FREEZE FRAME DATA  



Is DTC P2271 or P2273 on 
FREEZE FRAME DATA?  

Yes Go to the next step.

No

Go to the troubleshooting for the DTC on the 

FREEZE FRAME DATA. (See DTC TABLE 

[MZI-3.7].)

5

INSPECT REAR HO2S  



For DTC P2271 Inspect the rear 
HO2S(RH)  



For DTC P2273 Inspect the rear 
HO2S(LH) 

(See REAR HEATED OXYGEN 
SENSOR (HO2S) INSPECTION 
[MZI-3.7] .) 



Is there any malfunction?  

Yes

Inspect the related wiring harnesses. 
If there is no malfunction, replace the HO2S. (See 
REAR HEATED OXYGEN SENSOR (HO2S) 
REMOVAL/INSTALLATION [MZI-3.7] .)

No

Go to the next step.

6

VERIFY TROUBLESHOOTING OF 
DTC P2271, P2273 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.  



Perform no load racing at the engine 
speed of 2,500-3,500 rpm for 60s or 

Yes

Replace the PCM, then go to the next step. (See 
PCM REMOVAL/INSTALLATION [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 10:08:43 AM

Page 419 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P260F [MZI-3.7] 

DTC P260F (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

DIAGNOSTIC PROCEDURE 

DTC P260F (MZI-3.7) DIAGNOSTIC PROCEDURE 

more, then idle the engine for 60s or 
more.  



Perform the KOEO and KOER self-
test.  



Retrieve DTCs using the M-MDS.  



Is the PENDING CODE for this 
DTC present?  

No

Go to the next step.

7

VERIFY AFTER REPAIR 
PROCEDURE  



Perform "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 P260F

Evaporative emission system monitoring processor performance

DETECTION 

CONDITION 



This DTC sets when a concern is detected internal to the PCM. The 
microprocessor that controls the engine off natural vacuum (EONV) leak 
check monitor is separate from the main processor within the PCM.  

POSSIBLE 

CAUSE 



Module communications network concerns  



PCM calibration level  



PCM 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 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 

Yes

Perform repair or diagnosis according to the 
available Service Bulletins. 



If the vehicle is not repaired, 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 10:08:44 AM

Page 420 

© 2005 Mitchell Repair Information Company, LLC.