Mazda CX-9 Grand Touring. Manual — part 300

DTC P1397 [MZI-3.7]

DTC P1397 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

DIAGNOSTIC PROCEDURE

9



Inspect the CMP sensor. (See
CAMSHAFT POSITION (CMP)
SENSOR INSPECTION [MZI-
3.7] .)



Is there any malfunction?

Yes

Replace the CMP sensor, then go to Step 11. (See
CAMSHAFT POSITION (CMP) SENSOR
REMOVAL/INSTALLATION [MZI-3.7] .)

No

Go to the next step.

10

INSPECT PCM CONNECTOR FOR
POOR CONNECTION



Disconnect the PCM connector.



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



Are any malfunction?

Yes

Repair or replace suspected part, then go to the
next step.

No

Go to the next step.

11

VERIFY TROUBLESHOOTING OF
DTC P1336 HAS BEEN COMPLETED



Make sure to reconnect all
disconnected connectors.



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



Start the engine.



Is the same 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.

12

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 P1397

System voltage out of self-test range

DETECTION

CONDITION



This DTC indicates that the 12-volt system voltage is too high or too low
during the KOEO or KOER self-test. It sets if the system voltage falls below or
exceeds the calibrated threshold at any time during the KOEO or KOER self-
test.

POSSIBLE

CAUSE



Battery or charging system concern.

2008 Mazda CX-9 Grand Touring

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

Microsoft

Sunday, November 15, 2009 10:08:41 AM

Page 333

© 2005 Mitchell Repair Information Company, LLC.

DTC P1397 (MZI-3.7) DIAGNOSTIC PROCEDURE

DTC P1450 [MZI-3.7]

DTC P1450 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

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, go to the
next step.

No

Go to the next step.

3

INSPECT THE BATTERY



Turn the ignition switch off.



Inspect the battery.



Is the battery normal?

Yes

Inspect charging system. (See QUICK
DIAGNOSTIC CHART [MZI-3.7] .)



If there is any malfunction, repair or
replace malfunctioning part, then go to
the next step.

No

Replace the battery, then go to the next step.

4

VERIFY TROUBLESHOOTING OF
DTC P1397 HAS BEEN COMPLETED



Verify that all disconnected connectors
reconnected.



Clear the DTC from the PCM memory
using the 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 for the 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.

5

VERIFY AFTER REPAIR PROCEDURE



Perform "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.

2008 Mazda CX-9 Grand Touring

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

Microsoft

Sunday, November 15, 2009 10:08:41 AM

Page 334

© 2005 Mitchell Repair Information Company, LLC.

DIAGNOSTIC PROCEDURE

DTC P1450 (MZI-3.7) DIAGNOSTIC PROCEDURE

DTC P1450

Unable to bleed up fuel tank vacuum

DETECTION

CONDITION



P1450 indicates the Self-Test has detected that the EVAP system is unable to
bleed up fuel tank vacuum.

POSSIBLE CAUSE



Blockages or kinks in the charcoal canister tube or purge solenoid valve
outlet tube (between fuel tank, CV solenoid valve and charcoal canister).



Fuel filler cap is stuck closed (no vacuum relief).



Contaminated fuel vapor elbow on charcoal canister.



Restricted charcoal canister.



CV solenoid valve stuck open (partially or fully).



Plugged CV solenoid valve filter.



CV solenoid valve is stuck open.



Power supply open (wiring harness near Fuel tank pressure sensor, Fuel tank
pressure sensor or PCM).



Fuel tank pressure sensor 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, go to the next
step.

No

Go to the next step.

3

VERIFY RELATED PENDING CODE
OR STORED DTCs



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



Verify related pending code or
stored DTCs.



Are other DTCs present?

Yes

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

No

Go to the next step.

INSPECT FOR VISUAL CAUSES OF
EXCESSIVE FUEL TANK VACUUM

2008 Mazda CX-9 Grand Touring

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

Microsoft

Sunday, November 15, 2009 10:08:41 AM

Page 335

© 2005 Mitchell Repair Information Company, LLC.

4



Verify kinks or bends in the fuel
vapor hoses and tubes.



Visually inspect the charcoal
canister inlet port, CV solenoid
valve, EVAP dust separator or the
outlet hose for contamination or
foreign material.



Is a concern evident?

Yes

Remove any contamination or foreign material
around fuel vapor hoses and tubes.
Repair the hoses, tubes or components if
necessary. Go to Step 9.

No

Go to the next step.

5

PERFORM EVAP LEAK TEST



Connect the EVAP Leak Tester to
the fuel filler pipe.



Close the purge solenoid valve using
the EVMV PID.



Pressurize the EVAP system to 3.48
kPa (PID FTP_H2O displays "14").



Does the pressure reach 3.48 kPa
(PID FTP_H2O displays "14")?

Yes Go to the next step.

No

Check to see if the CV solenoid valve is stuck

open. Replace if necessary.

(See CHARCOAL CANISTER, CANISTER

VENT (CV) SOLENOID VALVE, AIR

FILTER COMPONENT

REMOVAL/INSTALLATION [MZI-3.7] .)

Go to Step 9.

6

INSPECT WHETHER CV SOLENOID
VALVE IS STUCK CLOSED



Open the purge solenoid valve using
the EVMV PID.



Does the pressure drop
immediately?

Yes Go to the next step.

No

Check to see if the CV solenoid valve is stuck

closed. Replace if necessary.

(See CHARCOAL CANISTER, CANISTER

VENT (CV) SOLENOID VALVE, AIR

FILTER COMPONENT

REMOVAL/INSTALLATION [MZI-3.7] .)

Go to Step 9.

7

INSPECT FOR FUEL TANK
PRESSURE SENSOR PID WITHOUT
PRESSURE APPLIED



Disconnect the charcoal canister
outlet tube at the charcoal canister.



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



Using M-MDS tester, select
Diagnostic Data Link.



Select PCM.



Select Active Command Modes.



Access FTP V PID and record the
reading.



Is the reading between 2.40 to 2.80
V?

Yes Go to the next step.

No

Replace the evaporative hose component.

(See FUEL TANK PRESSURE SENSOR

INSPECTION [MZI-3.7] .)

Go to the next step.

EVAP SYSTEM LEAK TEST

2008 Mazda CX-9 Grand Touring

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

Microsoft

Sunday, November 15, 2009 10:08:41 AM

Page 336

© 2005 Mitchell Repair Information Company, LLC.