Mazda CX-9 Grand Touring. Manual - part 260



KS terminal A and body 
ground.  



KS terminal B and body 
ground.  



Are there continuity?  

No

Go to the next step.

6

INSPECT PCM CONNECTOR FOR 
POOR CONNECTION  



Turn the ignition switch off.  



Disconnect the PCM sensor 
connector.  



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



Are there any malfunction?  

Yes

Repair or replace suspected part, then go to Step 
9.

No

Go to the next step.

7

INSPECT KS (LH) CIRCUIT FOR 
OPEN CIRCUIT  



Turn the ignition switch off.  



Inspect for continuity between the 
following terminals: 



KS terminal A and PCM 
terminal 2Q  



KS terminal B and PCM 
terminal 2M  



Are there continuity?  

Yes Go to the next step.

No

Repair or replace suspected part, then go to Step 

9.

8

INSPECT THE KS (LH)  



Inspect the KS (LH). (See KNOCK 
SENSOR (KS) INSPECTION 
[MZI-3.7] .)  



Is there malfunction?  

Yes

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

No

Go to the next step.

9

VERIFY TROUBLESHOOTING OF 
DTC P0330 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 

Yes

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

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 10:08:37 AM

Page 173 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0340 [MZI-3.7] 

DTC P0340 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

present?  

10

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 P0340

CMP sensor (RH) circuit

DETECTION 

CONDITION 



The test fails when the PCM can no longer detect the signal from the CMP 
sensor (RH),  

POSSIBLE CAUSE 



Connector or terminal malfunction  



CMP sensor (RH) malfunction  



Short to ground circuit between CMP sensor (RH) terminal A and PCM 
terminal 2X  



Short to power supply between CMP sensor (RH) terminal A and PCM 
terminal 2X  



Open circuit between CMP sensor (RH) terminal A and PCM terminal 2X  



Open circuit between CMP sensor (RH) terminal B and PCM terminal 2C  



PCM malfunction  

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:37 AM

Page 174 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC P0340 (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.

VERIFY RELATED REPAIR 

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:37 AM

Page 175 

© 2005 Mitchell Repair Information Company, LLC. 

2

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

CLEAR AND ATTEMPT TO RETRIEVE 
THE DTC 

 



Clear the DTC from the PCM memory 
using the M-MDS.  



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



Increase engine speed to more than 
1,500 rpm for 10 s. Repeat this 3 
times .  



Retrieve the continuous memory 
DTCs.  



The same DTC present?  

NOTE:



If DTCs P0340, P0344, P0345 or 
P0349 are present, ignition, 
alternator noise, radio frequency 
interference and CKP concerns 
should be considered.  

Yes Go to the next step.

No

Perform the "INTERMITTENT CONCERN 

TROUBLESHOOTING". Then go to Step 11.

4

CHECK THE GENERATOR FOR 
EXCESSIVE ELECTRICAL NOISE 

 



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



Monitor the generator for an audible 
electric noise.  



Turn the ignition switch off.  



Generator/regulator terminal B 
disconnected.  

NOTE:



If the generator/regulator is 
electrically noisy, the noise 
decreases when the terminal B is 
disconnected.  

Yes Go to the next step.

No



Inspect the charging system, then go to 

Step 11. 



Drive belt damaged and 

misinstallation  



Generator pulley or generator 

misinstallation  

 

2008 Mazda CX-9 Grand Touring 

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

  

Microsoft 

 

Sunday, November 15, 2009 10:08:37 AM

Page 176 

© 2005 Mitchell Repair Information Company, LLC.