Mazda CX-9 Grand Touring. Manual - part 282

DTC P0602 [MZI-3.7] 

DTC P0602 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

DIAGNOSTIC PROCEDURE 

DTC P0602 (MZI-3.7) DIAGNOSTIC PROCEDURE 

4

position (Engine off).  



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



Perform the KOEO and KOER self-
test.  



Retrieve DTCs using the M-MDS.  



Is the PENDING CODE for this DTC 
present?  

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.

DTC P0602

PCM programming error

DETECTION 

CONDITION 



This DTC indicates a programming error within the vehicle ID block. 

POSSIBLE CAUSE 



Vehicle ID data corrupted by the M-MDS during vehicle ID 
reprogramming  

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

Reprogram the vehicle ID using the M-MDS, 

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 10:08:39 AM

Page 261 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0603 [MZI-3.7] 

DTC P0603 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

3

VERIFY TROUBLESHOOTING OF 
DTC P0602 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". (See KOEO/KOER SELF 
TEST [MZI-3.7].)  



Retrieve DTCs using the M-MDS.  



Is the 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.

4

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 P0603

PCM keep alive memory (KAM) error

DETECTION 

CONDITION 



Indicates the PCM has experienced an internal memory concern. However, there 
are external items that can cause this DTC.  

POSSIBLE CAUSE 



Reprogramming  



Battery terminal corrosion  



Open circuit between battery positive terminal and PCM terminal 1 BB  



Connector or terminal malfunction  



Loose battery connection  

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:39 AM

Page 262 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC P0603 (MZI-3.7) DIAGNOSTIC PROCEDURE 

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS 
BEEN RECORDED  



Has FREEZE FRAME DATA been 

Yes Go to the next step.

No

Record FREEZE FRAME DATA on the 

repair order, 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 10:08:39 AM

Page 263 

© 2005 Mitchell Repair Information Company, LLC. 

recorded?  

2

VERIFY RELATED REPAIR 
INFORMATION AVAILABILITY  



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



Is any Service Bulletins available?  

Yes

Perform repair or diagnosis according to 
available Service Bulletins. 



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

No

Go to the next step.

3

INSPECT BATTERY TERMINALS FOR 
POOR CONNECTION  



Turn the ignition switch off.  



Inspect for poor connection and 
corrosion.  



Are there any malfunction?  

Yes

Repair or replace suspected part, then go to 
Step 7.

No

Go to the next step.

4

INSPECT PCM CONNECTOR FOR 
POOR CONNECTION  



Turn the ignition switch off.  



Disconnect the PCM connector.  



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



Is there any malfunction?  

Yes

Repair or replace suspected part, then go to 
Step 7.

No

Go to the next step.

5

INSPECT MONITOR CIRCUIT FOR 
OPEN CIRCUIT  



Turn the ignition switch off.  



Disconnect the battery cables.  



Disconnect the PCM connector.  



Inspect the continuity between battery 
positive terminal (wiring harness-side) 
and PCM terminal 1BB (wiring harness-
side).  



Is there continuity?  

Yes Go to the next step.

No

Repair or replace suspected part, then go to 

Step 7.

6

INSPECT FOR CORRECT PCM 
OPERATION  



Disconnect all the PCM connectors.  



Visually inspect for: 



Pushed out pins  



Corrosion  



Connect all the PCM connectors and 
verify that they seat correctly.  

Yes Go to the next step.

No

The system is correctly. 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 10:08:39 AM

Page 264 

© 2005 Mitchell Repair Information Company, LLC.