Mazda CX-9 Grand Touring. Manual - part 262

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 181 

© 2005 Mitchell Repair Information Company, LLC. 



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



With the engine running, determine if 
the generator is still noisy.  



Does the noise remain constant when 
the terminal B is disconnected?  

5

INSPECT CMP SENSOR (RH) 
CONNECTOR FOR POOR 
CONNECTION  



Turn the ignition switch off.  



Disconnect the CMP sensor (RH) 
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 
11.

No

Go to the next step.

6

INSPECT CMP SENSOR SIGANAL 
CIRCUIT FOR SHORT TO POWER 
SUPPLY  



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



Measure voltage between CMP sensor 
(RH) terminal A (wiring harness-side) 
and body ground.  



Is the voltage B+?  

Yes

Repair or replace suspected part, then go to Step 
11.

No

Go to the next step.

7

INSPECT CMP SENSOR (RH) SIGNAL 
CIRCUIT FOR SHORT TO GROUND  



Turn the ignition switch off.  



Check continuity between CMP sensor 
(RH) terminal A and body ground.  



Is there continuity?  

Yes

Repair or replace suspected part, then go to Step 
11.

No

Go to the next step.

8

INSPECT PCM CONNECTOR FOR 
POOR CONNECTION  



Turn the ignition switch off.  



Disconnect PCM connector.  



Check for poor connection (such as 
damaged, pulled-out pins, and 
corrosion).  



Are there any malfunction?  

Yes

Repair or replace suspected part, then go to Step 
11.

No

Go to the next step.

INSPECT CMP SENSOR (RH) CIRCUIT 

 

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 182 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0345 [MZI-3.7] 

DTC P0345 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

9

FOR OPEN CIRCUIT  



Turn the ignition switch off.  



Check continuity between the 
following circuits: 



CMP sensor (RH) terminal A 
and PCM terminal 2X  



CMP sensor (RH) terminal B 
and PCM terminal 2C  



Is there continuity?  

Yes Go to the next step.

No

Repair or replace suspected part, then go to Step 

11.

10

INSPECT CMP SENSOR (RH)  



Inspect CMP sensor (RH). (See 
CRANKSHAFT POSITION (CKP) 
SENSOR INSPECTION [MZI-
3.7] .)  



Is there any malfunction?  

Yes

Replace CMP sensor (RH), then go to the next 
step. (See CRANKSHAFT POSITION (CKP) 
SENSOR REMOVAL/INSTALLATION 
[MZI-3.7] .)

No

Go to the next step.

11

VERIFY TROUBLESHOOTING OF 
DTC P0344 COMPLETED  



Verify that all disconnected 
connectors reconnected.  



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



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



Start the engine.  



Access the MAF PID using the M-
MDS.  



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.

12

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 P0345

CMP sensor (LH) circuit

DETECTION 

 

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 183 

© 2005 Mitchell Repair Information Company, LLC. 

CONDITION 



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

POSSIBLE CAUSE 



Connector or terminal malfunction  



CMP sensor (LH) malfunction  



Short to ground circuit between CMP sensor (LH) terminal A and PCM 
terminal 2AB  



Short to power supply between CMP sensor (LH) terminal A and PCM 
terminal 2AB  



Open circuit between CMP sensor (LH) terminal A and PCM terminal 2AB  



Open circuit between CMP sensor (LH) 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 184 

© 2005 Mitchell Repair Information Company, LLC.