Mazda CX-9 Grand Touring. Manual — part 287

DIAGNOSTIC PROCEDURE

DTC P0620 (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 CONDITION



Verify that drive belt auto tensioner
indicator mark does not exceed limit.



Is drive belt normal?

Yes Go to the next step.

No

Replace and/or adjust drive belt, then go to Step

12. (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 12.

No

Go to the next step.

5

INSPECT GENERATOR CIRCUIT FOR
SHORT TO POWER SUPPLY



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



Measure voltage between generator
terminal LI (wiring harness-side) and
body ground.



Is voltage B+?

Yes

Repair or replace suspected part, then go to Step
12.

No

Go to the next step.

6

INSPECT GENERATOR CIRCUIT FOR
SHORT TO GROUND



Inspect for continuity between
generator terminal LI (wiring harness-
side) and body ground.



Is there continuity?

Yes

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

No

Go to the next step.

7

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
12.

No

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 282

© 2005 Mitchell Repair Information Company, LLC.

8

INSPECT GENERATOR CIRCUIT FOR
OPEN CIRCUIT



Inspect for continuity between
generator terminal LI (wiring harness-
side) and PCM terminal 2AG (wiring
harness-side)



Is there continuity?

Yes Go to the next step.

No

Repair or replace suspected part, then go to Step

12.

9

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 12.

No

Go to the next step.

10

INSPECT GENERATOR CIRCUIT FOR
OPEN CIRCUIT



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



Is there continuity?

Yes Go to the next step.

No

Repair or replace suspected part, then go to Step

12.

11

INSPECT GENERATOR



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



Is there any malfunction?

Yes

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

No

Go to the next step.

12

VERIFY TROUBLESHOOTING OF
DTC P0620 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.

VERIFY AFTER REPAIR PROCEDURE

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

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© 2005 Mitchell Repair Information Company, LLC.

DTC P0625 [MZI-3.7]

DTC P0625 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

13



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 P0625

Generator field terminal circuit low

DETECTION

CONDITION



The PCM monitors generator load from the generator/regulator in the form of
frequency. The concern indicates the input is lower than the load should be in normal
operation. The load input could be low when no generator output exists.

POSSIBLE

CAUSE



Drive belt damaged



Generator malfunction



Short to ground between generator terminal RC and PCM terminal 2S



Short to ground between generator terminal LI and PCM terminal 2AG



Open circuit between terminal B and battery positive terminal



Low system voltage



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 10:08:39 AM

Page 284

© 2005 Mitchell Repair Information Company, LLC.