Mazda CX-9 Grand Touring. Manual — part 277

4

INSPECT AIR CLEANER ELEMENT



Remove air cleaner element with the
engine running.



Is the engine speed increased?

Yes Replace the air cleaner element, then go to Step 9.

No

Go to the next step.

5

INSPECT FOR AIR SUCTION AT
INTAKE AIR SYSTEM



Inspect for air leakage at the
following:



Around connection of
dynamic chamber and intake
manifold



Around connection of intake
manifold and cylinder head



Is air leakage found?

Yes

Repair or replace the suspected part, then go to
Step 9.

No

Go to the next step.

6

INSPECT THROTTLE BODY
PASSAGE



Is the throttle body clogged?

Yes

Clean or replace the throttle body passage, then go
to Step 9.

No

Go to the next step.

7

INSPECT ENGINE COMPRESSION



Inspect the engine compression. (See
COMPRESSION INSPECTION
[MZI-3.7] .)



Is the engine compression normal?

Yes Go to the next step.

No

Overhaul the engine, then go to the next step.

8

INSPECT FOR RESTRICTION IN
EXHAUST SYSTEM AND TWC



Is there any restriction?

Yes

Replace malfunctioning part, then go to the next
step.

No

Go to the next step.

9

VERIFY TROUBLESHOOTING OF
DTC P0505 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 the KOEO and KOER self-
test.



Retrieve the DTCs using the M-
MDS.

Yes

Replace the PCM, then go to the next step. (See
PCM REMOVAL/INSTALLATION [MZI-
3.7] .)

No

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 10:08:38 AM

Page 241

© 2005 Mitchell Repair Information Company, LLC.

DTC P0506 [MZI-3.7]

DTC P0506 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

DIAGNOSTIC PROCEDURE

DTC P0506 (MZI-3.7) DIAGNOSTIC PROCEDURE



Is the PENDING CODE for this
DTC present?

10

VERIFY AFTER REPAIR
PROCEDURE



Perform the "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 P0506

IAC system RPM lower than expected

DETECTION

CONDITION



This DTC is set when the PCM detects an engine idle speed that is less
than the desired engine speed.

POSSIBLE CAUSE



Engine mechanical concern



Intake air restriction



Exhaust restriction



Sludged throttle body



Vacuum leakage



Throttle body malfunction



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.

Yes

Perform repair or diagnosis according to the
available Service Bulletins.



If the vehicle is not repaired, 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 10:08:38 AM

Page 242

© 2005 Mitchell Repair Information Company, LLC.



Is any related Service Bulletins
available?

No

Go to the next step.

3

VERIFY RELATED PENDING OR
STORED DTCS



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



Verify pending code or stored
DTCs using the M-MDS.



Is other DTC present?

Yes

Repair applicable DTCs. (See DTC TABLE [MZI-
3.7].)

No

Go to the next step.

4

INSPECT AIR CLEANER ELEMENT



Remove air cleaner element with
the engine running.



Is the engine speed increased?

Yes Replace the air cleaner element, then go to Step 7.

No

Go to the next step.

5

INSPECT INTAKE AIR SYSTEM
FOR EXCESSIVE AIR SUCTION



Visually inspect the hose in intake
air system for damages.



Is there any malfunction?

Yes

Repair or replace the malfunctioning part, then go
to Step 7.

No

Go to the next step.

6

INSPECT THROTTLE BODY
PASSAGE



Is the throttle body clogged?

Yes

Clean or replace the throttle body passage, then go
to the next step.

No

Go to the next step.

7

VERIFY TROUBLESHOOTING OF
DTC P0506 HAS BEEN
COMPLETED



Verify that all disconnected
connectors reconnected.



Start the engine.



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



Depress brake pedal for 14 s or
more.



Is 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 the "AFTER REPAIR
PROCEDURE".

Yes

Go to the applicable DTC inspection. (See DTC
TABLE [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 10:08:38 AM

Page 243

© 2005 Mitchell Repair Information Company, LLC.

DTC P0507 [MZI-3.7]

DTC P0507 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

DIAGNOSTIC PROCEDURE

DTC P0507 (MZI-3.7) DIAGNOSTIC PROCEDURE

(See AFTER REPAIR
PROCEDURE [MZI-3.7].)



Are any DTCs present?

No

Troubleshooting completed.

DTC P0507

IAC system RPM higher than expected

DETECTION

CONDITION



This DTC is set when the PCM detects an engine idle speed that is more
than the desired engine speed.

POSSIBLE CAUSE



Intake air leak after throttle body



Vacuum leakage



EVAP system malfunction



Throttle body malfunction



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
available?

Yes

Perform repair or diagnosis according to the
available Service Bulletins.



If the vehicle is not repaired, then go to
the next step.

No

Go to the next step.

3

VERIFY RELATED PENDING OR
STORED DTCS



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



Verify pending code or stored DTCs
using the M-MDS.



Is other DTC present?

Yes

Repair applicable DTCs. (See DTC TABLE
[MZI-3.7].)

No

Go to the next step.

INSPECT AIR CLEANER ELEMENT

Replace the air cleaner element, then go to Step

2008 Mazda CX-9 Grand Touring

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

Microsoft

Sunday, November 15, 2009 10:08:38 AM

Page 244

© 2005 Mitchell Repair Information Company, LLC.