Mazda CX-9 Grand Touring. Manual - part 231

been recorded?  

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

INSPECT MAF SENSOR 
CONNECTOR FOR POOR 
CONNECTION  



Turn the ignition switch off.  



Disconnect the MAF/IAT 
sensor connector.  



Inspect for poor connection 
(such as damaged/pulled-out 
pins, corrosion).  



Are there any malfunction?  

Yes Repair or replace suspected part, then go to Step 7.

No

Go to the next step.

4

INSPECT MAF SIGNAL 
CIRCUIT FOR SHORT TO 
POWER SUPPLY  



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



Measure voltage between MAF 
sensor terminal D (wiring 
harness-side) and body ground. 



Is voltage B+?  

No Repair or replace suspected part, then go to Step 7.

Yes

Go to the next step.

5

INSPECT PCM CONNECTOR 
FOR POOR CONNECTION  



Turn the ignition switch off.  



Disconnect PCM connector.  



Inspect for poor connection 
(such as damaged/pulled-out 
pins, corrosion).  



Are there any malfunction?  

No Repair or replace suspected part, then go to Step 7.

Yes

Go to the next step.

6

INSPECT THE MAF SENSOR  



Inspect the MAF sensor. (See 
MASS AIR FLOW (MAF) 
SENSOR INSPECTION 

Yes

Replace the MAF/IAT sensor (See MASS AIR FLOW 
(MAF)/INTAKE AIR TEMPERATURE (IAT) 
SENSOR REMOVAL/INSTALLATION [MZI-
3.7] .), then go to Step 7.

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:34 AM

Page 57 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0104 [MZI-3.7] 

DTC P0104 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

[MZI-3.7] .)  



Is there malfunction?  

No

Go to the next step.

7

VERIFY TROUBLESHOOTING 
OF DTC P0103 HAS BEEN 
COMPLETED  



Verify that all disconnected 
connectors reconnected.  



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



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



Start engine and warm it up 
completely.  



Is same DTC present?  

Yes

Replace 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 P0104

MAF circuit intermittent/erratic

DETECTION 

CONDITION 



A concern exists in the MAF sensor circuit, or the air tube containing the sensor,
causing an incorrect air flow reading.  

POSSIBLE CAUSE 



Air leaks in the tube from the MAF to the throttle body  



Open circuit wiring harness between MAF sensor terminal C and PCM terminal 
1AJ  



Open circuit wiring harness between MAF sensor terminal D and PCM terminal 
1 AN  



Short to power supply in wiring harness between MAF sensor terminal C and 
PCM terminal 1AJ  



Short to power supply in wiring harness between MAF sensor terminal D and 
PCM terminal 1 AN  



Short to ground circuit between MAF sensor terminal C and PCM terminal 1 AJ 



Short to ground circuit between MAF sensor terminal D and PCM terminal 1 
AN  

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:34 AM

Page 58 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC P0104 (MZI-3.7) DIAGNOSTIC PROCEDURE 



Connector or terminal malfunction  

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS 
BEEN RECORDED  

Yes Go to 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 10:08:34 AM

Page 59 

© 2005 Mitchell Repair Information Company, LLC. 

1



Has FREEZE FRAME DATA been 
recorded?  

No

Record FREEZE FRAME DATA on the repair 

order, then go to next step.

2

VERIFY RELATED REPAIR 
INFORMATION AVAILABILITY  



Verify related Service Bulletins 
availability.  



Is any related Service Bulletins 
available?  

Yes

Perform repair or diagnosis according to 
available Service Bulletins. 



If vehicle is not repaired, go to next step.  

No

Go to next step.

3

VERIFY RELATED PENDING CODE 
OR STORED DTC  



Verify the related PENDING CODE or 
stored DTCs.  



Are other DTCs present?  

Yes

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

No

Go to next step.

4

INSPECT AIR SUCTIONING 
BETWEEN MAF SENSOR AND TP 
SENSOR  



Inspect for major leaks, cracks and 
openings between MAF sensor and 
throttle body.  



Are there any malfunction?  

Yes

Repair or replace the malfunctioning part, then 
go to Step 10.

No

Go to next step.

5

INSPECT MAF SENSOR CONNECTOR 
FOR POOR CONNECTION  



Turn the ignition switch off.  



Disconnect the MAF/IAT sensor 
connector.  



Inspect for poor connection (such as 
damaged/pulled-out pins, corrosion).  



Are there any malfunction?  

Yes

Repair or replace the malfunctioning part, then 
go to Step 10.

No

Go to next step.

6

INSPECT MAF SIGNAL CIRCUIT FOR 
SHORT TO POWER SUPPLY  



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



Measure voltage between the following 
terminals: 



MAF sensor terminal C (wiring 
harness-side) and body ground  



MAF sensor terminal D (wiring 
harness-side) and body ground  

Yes

Repair or replace the malfunctioning part, then 
go to Step 10.

No

Go to 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 10:08:34 AM

Page 60 

© 2005 Mitchell Repair Information Company, LLC.