Mazda CX-9 Grand Touring. Manual - part 292

 

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 301 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC P0685 (MZI-3.7) DIAGNOSTIC PROCEDURE 

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 MAIN RELAY NO.1 
CONTROL CIRCUIT FOR SHORT TO 
GROUND  



Turn the ignition switch off.  



Inspect for continuity between main 
relay No.1 terminal A (wiring harness-
side) and body ground.  



Is there continuity?  

Yes

Repair or replace suspected part, then go to Step 
5.

No

Go to the next step.

4

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.  



Retrieve DTCs using the M-MDS.  



Is the PENDING CODE for this DTC 
present?  

Yes Go to the next step.

No

The system is correctly. Go to the next step.

VERIFY TROUBLESHOOTING OF 
DTC P0685 HAS BEEN COMPLETED  



Verify that all disconnected connectors 
reconnected.  



Clear the DTC from the PCM memory 

Yes

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

 

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 302 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0689 [MZI-3.7] 

DTC P0689 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

5

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?  

No

Go to the next step.

6

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 P0689

ECM/PCM power relay sense circuit low

DETECTION 

CONDITION 



This DTC sets when the passive anti theft system (PATS) system indicates the key 
is in ON or START position and the ignition switch position run circuit indicates 
OFF, ACC, or LOCK position.  

POSSIBLE 

CAUSE 



Ignition circuit fuse (MAIN, IG KEY 1, IG KEY 2)  



Open circuit between battery positive terminal and PCM terminal 1 BD  



Short to ground circuit between battery positive terminal and PCM terminal 1 BD  



Ignition switch malfunction  



PATS system 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 303 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC P0689 (MZI-3.7) DIAGNOSTIC PROCEDURE 

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:40 AM

Page 304 

© 2005 Mitchell Repair Information Company, LLC.