Mazda CX-9 Grand Touring. Manual — part 268

DIAGNOSTIC PROCEDURE

DTC P0443 (MZI-3.7) DIAGNOSTIC PROCEDURE

POSSIBLE CAUSE



Purge solenoid valve malfunction



Connector or terminal malfunction



Short to ground between purge solenoid valve terminal B and PCM terminal 1 BC



Open circuit between main relay No.1 terminal D and purge solenoid valve terminal
A



Short to power supply between purge solenoid valve terminal B and PCM terminal
1 BC



Open circuit between purge solenoid valve terminal B and PCM terminal 1 BC



PCM malfunction

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA
HAS BEEN RECORDED

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 10:08:37 AM

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1



Has FREEZE FRAME DATA been
recorded?

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

Go to the next step.

3

INSPECT PURGE SOLENOID
VALVE CONNECTOR FOR POOR
CONNECTION



Turn the ignition switch off.



Disconnect purge solenoid valve
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 voltage between purge
solenoid valve terminal A and body
ground.



Is voltage B+?

Yes Go to the next step.

No

Repair or replace suspected part, then go to Step

10.

5

INSPECT PURGE SOLENOID
VALVE CONTROL CIRCUIT FOR
SHORT TO POWER SUPPLY



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



Measure the voltage between purge
solenoid valve control terminal B
and body ground.



Is voltage B+?

Yes

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

No

Go to the next step.

INSPECT PURGE SOLENOID
VALVE CONTROL CIRCUIT FOR
SHORT TO GROUND

Yes

Repair or replace suspected part, then go to the

2008 Mazda CX-9 Grand Touring

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

Microsoft

Sunday, November 15, 2009 10:08:37 AM

Page 206

© 2005 Mitchell Repair Information Company, LLC.

6



Turn the ignition switch off.



Inspect for continuity between
purge solenoid valve control
terminal B and body ground.



Is there continuity?

Step 10.

No

Go to the next step.

7

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).



Is there any malfunction? v

Yes

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

No

Go to the next step.

8

INSPECT PURGE SOLENOID
VALVE CONTROL CIRCUIT FOR
OPEN CIRCUIT



Turn the ignition switch off.



Inspect continuity between purge
solenoid valve terminal B and PCM
terminal 1BC.



Is there continuity?

Yes Go to the next step.

No

Repair or replace suspected part, then go to the

Step 10.

9

INSPECT PURGE SOLENOID
VALVE



Inspect the purge solenoid valve.
(See PURGE SOLENOID
VALVE INSPECTION [MZI-
3.7] .)



Is there any malfunction?

Yes

Replace purge solenoid valve (See PURGE
SOLENOID VALVE
REMOVAL/INSTALLATION [MZI-3.7] .), then
go to Step 10.

No

Go to the next step.

10

VERIFY TROUBLESHOOTING OF
DTC P0443 COMPLETED



Make sure to reconnect all
disconnected connectors.



Clear DTC from PCM memory
using M-MDS.



Perform the "KOEO or KOER self-
test" using the M-MDS. (See
KOEO/KOER SELF TEST
[MZI-3.7].)



Is the PENDING CODE same DTC

Yes

Replace 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 207

© 2005 Mitchell Repair Information Company, LLC.

DTC P0446 [MZI-3.7]

DTC P0446 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

present?

11

VERIFY AFTER REPAIR
PROCEDURE



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



Are any DTCs present?

Yes

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

No

Troubleshooting completed.

DTC P0446

CV solenoid valve control circuit

DETECTION

CONDITION



Monitors the CV solenoid valve circuit for an electrical failure. The test fails when
the signal moves outside the minimum or maximum allowable calibrated parameters
for a specified canister vent duty cycle by PCM command.

POSSIBLE

CAUSE



CV solenoid valve malfunction



Connector or terminal malfunction



Short to ground between CV solenoid valve terminal B and PCM terminal 1Z



Open circuit between battery and CV solenoid valve terminal A



Short to power supply between CV solenoid valve terminal B and PCM terminal 1Z



Open circuit between CV solenoid valve terminal B and PCM terminal 1Z



PCM malfunction

2008 Mazda CX-9 Grand Touring

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

Microsoft

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

Page 208

© 2005 Mitchell Repair Information Company, LLC.