Mazda CX-9 Grand Touring. Manual - part 288

DIAGNOSTIC PROCEDURE 

DTC P0625 (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 

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:40 AM

Page 285 

© 2005 Mitchell Repair Information Company, LLC. 

recorded?  

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 DRIVE BELT DAMAGED  



Verify inspect the drive belt for 
damage.  



Is the drive belt normal?  

Yes Go to the next step.

No

Replace the drive belt, then go to Step 10. (See 

DRIVE BELT INSPECTION [MZI-3.7] .)

4

INSPECT GENERATOR TERMINAL 
FOR POOR INSTALLATION  



Turn the engine switch off.  



Inspect generator terminal B for 
looseness.  



Are there any malfunction?  

Yes

Connect generator terminal B correctly, then go 
to Step 10.

No

Go to the next step.

5

INSPECT GENERATOR CIRCUIT FOR 
SHORT TO GROUND  



Inspect for continuity between the 
following terminal: 



Generator terminal RC (wiring 
harness-side) and body ground.  



Generator terminal LI (wiring 
harness-side) and body ground.  



Are there continuity?  

Yes

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

No

Go to the next step.

6

INSPECT BATTERY POSITIVE 
TERMINAL FOR POOR 
INSTALLATION  



Turn the engine switch off.  



Inspect the battery positive terminal for 
looseness.  



Is there any malfunction?  

Yes

Connect the battery positive terminal correctly, 
then go to Step 10.

No

Go to the next step.

7

INSPECT GENERATOR CIRCUIT FOR 
OPEN CIRCUIT  



Inspect the continuity between 
generator terminal B (wiring harness-
side) and battery positive terminal 

Yes Go to the next step.

Repair or replace suspected part, then go to 

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:40 AM

Page 286 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0626 [MZI-3.7] 

DTC P0626 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

(wiring harness-side)  



Is there continuity?  

No

Step 10.

8

INSPECT PCM CONNECTOR FOR 
POOR CONNECTION  



Turn the engine switch off.  



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



Are there any malfunction?  

Yes

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

No

Go to the next step.

9

INSPECT GENERATOR  



Inspect the generator. (See 
GENERATOR INSPECTION [MZI-
3.7] .)  



Is there any malfunction?  

Yes

Replace the generator, then go to Step 10. (See 
GENERATOR 
REMOVAL/INSTALLATION [MZI-3.7] .)

No

Go to the next step.

10

VERIFY TROUBLESHOOTING OF DTC 
P0625 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.

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 P0626

Generator field terminal circuit high

DETECTION 

CONDITION 



The PCM monitors generator load from the generator/regulator in the form of 
frequency. The concern indicates the input is higher than the load should be in normal
operation. The load input could be high when a battery short to ground exists.  

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:40 AM

Page 287 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC P0626 (MZI-3.7) DIAGNOSTIC PROCEDURE 

POSSIBLE 

CAUSE 



Open circuit in wiring harness between generator terminal RC and PCM terminal 2S 



Short to power supply between generator terminal RC and PCM terminal 2S  



Short to power supply between generator terminal LI and PCM terminal 2AG  



Connector or terminal malfunction  

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:40 AM

Page 288 

© 2005 Mitchell Repair Information Company, LLC.