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.