Mazda CX-9 Grand Touring. Manual — part 230

2

AVAILABILITY



Verify related Service
Bulletins and/or on-line repair
information availability.



Is any related Service Bulletins
available?

Yes

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 10.

No

Go to the next step.

4

INSPECT POWER SUPPLY
CIRCUIT FOR OPEN CIRCUIT



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



Measure the voltage between
MAF sensor terminal A and
body ground.



Is the voltage B+?

Yes Go to the next step.

No

Repair or replace suspected part, then go to Step 10.

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?

Yes Repair or replace suspected part, then go to Step 10.

No

Go to the next step.

INSPECT MAF SENSOR
SIGNAL CIRCUIT FOR OPEN
CIRCUIT



Remove PCM with PCM
connector connected.



Inspect for continuity between
the following circuits:

Yes 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 10:08:34 AM

Page 53

© 2005 Mitchell Repair Information Company, LLC.

6



MAF sensor terminal C
(wiring harness-side)
and PCM terminal 1AJ
(wiring harness-side)



MAF sensor terminal D
(wiring harness-side)
and PCM terminal 1AN
(wiring harness-side)



Are there continuity?

No

Repair or replace suspected part, then go to Step 10.

7

INSPECT MAF SENSOR
SIGNAL CIRCUIT FOR SHORT
TO GROUND



Turn the ignition switch off.



Disconnect the MAF/IAT
sensor and PCM connector.



Inspect continuity between
following circuits:



MAF sensor connector
terminal D and body
ground



Are there continuity?

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

No

Go to the next step.

8

INSPECT MAF SENSOR
GROUND CIRCUIT FOR OPEN
CIRCUIT



Inspect continuity between
MAF sensor terminal B and
body ground.



Are there continuity?

Yes Go to the next step.

No

Repair or replace suspected part, then go to Step 10.

9

INSPECT THE MAF SENSOR



Inspect the MAF sensor

(See MASS AIR FLOW
(MAF) SENSOR
INSPECTION [MZI-3.7] .)



Are there any malfunction?

Yes

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

No

Go to the next step.

VERIFY TROUBLESHOOTING
OF DTC P0102 HAS BEEN
COMPLETED



Verify that all disconnected

Yes

Replace 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 10:08:34 AM

Page 54

© 2005 Mitchell Repair Information Company, LLC.

DTC P0103 [MZI-3.7]

DTC P0103 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

10

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?

No

Go to the next step.

11

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 P0103

MAF circuit high input

DETECTION

CONDITION



The MAF sensor circuit is monitored by the PCM for high air flow (or voltage) input
through the CCM. If during KOEO, or KOER, the air flow (or voltage) changes
above a maximum calibrated limit, the test fails.

POSSIBLE

CAUSE



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



MAF sensor malfunction



Connector or terminal malfunction

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 55

© 2005 Mitchell Repair Information Company, LLC.

DIAGNOSTIC PROCEDURE

DTC P0103 (MZI-3.7) DIAGNOSTIC PROCEDURE

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA
HAS BEEN RECORDED



Has FREEZE FRAME DATA

Yes Go to the next step.

No

Record FREEZE FRAME DATA on the repair order,

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 56

© 2005 Mitchell Repair Information Company, LLC.