Mazda CX-9 Grand Touring. Manual - part 300

 

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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. 

 

 

 

 

 

 

 

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