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

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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.