Mazda CX-9 Grand Touring. Manual - part 305

3

INSPECT PSP SWITCH 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 8.

No

Go to the next step.

4

INSPECT PSP SWITCH CIRCUIT FOR 
SHORT TO GROUND  



Turn the ignition switch off.  



Inspect for continuity between PSP 
switch terminal A (wiring harness-side) 
and body ground.  



Is there continuity?  

Yes

Repair or replace suspected part, then go to 
Step 8.

No

Go to the next step.

5

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 8.

No

Go to the next step.

6

INSPECT PSP SWITCH CIRCUIT FOR 
OPEN CIRCUIT  



Inspect for continuity between PSP 
switch terminal A (wiring harness-side) 
and PCM terminal 21 (wiring harness-
side)  



Is there continuity?  

Yes Go to the next step.

No

Repair or replace suspected part, then go to 

Step 8.

7

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.  

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 10:08:41 AM

Page 353 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P1674 [MZI-3.7] 

DTC P1674 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

DIAGNOSTIC PROCEDURE 

DTC P1674 (MZI-3.7) DIAGNOSTIC PROCEDURE 



Is the PENDING CODE for this DTC 
present?  

8

VERIFY TROUBLESHOOTING OF DTC 
P1650 HAS BEEN COMPLETED  



Verify that all disconnected connectors 
reconnected.  



Start the engine.  



Clear DTC from PCM memory using 
M-MDS.  



Perform the "KOEO/KOER Self-Test". 
(See KOEO/KOER SELF TEST 
[MZI-3.7].)  



Is same 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.

9

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 P1674

Control module software corrupted

DETECTION 

CONDITION 



Indicates that an error occurred in the PCM. This DTC is set in 
combination with P2105.  

POSSIBLE CAUSE 



Software incompatibility issue  



PCM malfunction  

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.

VERIFY RELATED REPAIR 
INFORMATION AVAILABILITY  

Yes

Perform repair or diagnosis according to the 
available Service Bulletins. 

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:41 AM

Page 354 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P1703 [MZI-3.7] 

DTC P1703 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

2



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



Is any related Service Bulletins 
available?  



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

No

Perform the PCM reprogramming procedure. (See 

PCM CONFIGURATION [MZI-3.7] .)Then go 

to the next step.

3

VERIFY TROUBLESHOOTING OF 
DTC P1674 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.  



Start the engine and perform the 
KOEO and KOER self-test.  



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 DTC present?  

Yes

Go to the applicable DTC inspection. (See DTC 
TABLE [MZI-3.7].)

No

Troubleshooting completed.

DTC P1703

Brake switch out of self-test range

DETECTION 

CONDITION 



Indicates that during the KOEO self-test, the brake pedal position signal was high, 
or during the KOER self-test, the BPP signal did not cycle high and low.  

POSSIBLE CAUSE 



Connector or terminal malfunction  



Brake switch No.1 malfunction  



Brake switch No.1 misinstallation  



Brake switch No.1 circuit malfunction  

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:41 AM

Page 355 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC P1703 (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 next step.

No

Record FREEZE FRAME DATA on the repair 

order, then go to next step.

VERIFY RELATED REPAIR 
INFORMATION AVAILABILITY  

Yes

Perform repair or diagnosis according to available 
Service Bulletins. 

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:42 AM

Page 356 

© 2005 Mitchell Repair Information Company, LLC.