Mazda CX-9 Grand Touring. Manual - part 279

 

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 249 

© 2005 Mitchell Repair Information Company, LLC. 

DIAGNOSTIC PROCEDURE 

DTC P053A (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 PCV VALVE HEATER 
CONTROL AND PCV VALVE HEATER 
FITTING CONNECTOR FOR POOR 
CONNECTION  



Turn the ignition switch off.  



Disconnect PCV valve heater control and 
PCV valve heater fitting 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 10.

No

Go to the next step.

4

INSPECT POWER SUPPLY CIRCUIT 
FOR OPEN CIRCUIT  



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



Inspect the voltage between the following 
circuit: 



PCV valve heater control terminal 
A (wiring harness-side) and body 
ground  



PCV valve heater fitting terminal A 
(wiring harness-side) and body 
ground  



Are there voltage B+?  

Yes Go to the next step.

No

Repair or replace suspected part, then go to 

Step 10.

INSPECT PCV VALVE HEATER 
CONTROL AND PCV VALVE HEATER 
FITTING CIRCUIT FOR SHORT TO 
POWER SUPPLY  

 

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 250 

© 2005 Mitchell Repair Information Company, LLC. 

5



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



Inspect for continuity between the 
following circuit: 



PCV valve heater control terminal 
B (wiring harness-side) and body 
ground  



PCV valve heater fitting terminal B 
(wiring harness-side) and body 
ground  



Are there voltage B+?  

Yes

Repair or replace suspected part, then go to 
Step 10.

No

Go to the next step.

6

INSPECT PCV VALVE HEATER 
CONTROL AND PCV VALVE HEATER 
FITTING CIRCUIT FOR SHORT TO 
GROUND  



Inspect for continuity between the 
following circuit: 



PCV valve heater control terminal 
B (wiring harness-side) and body 
ground  



PCV valve heater fitting terminal B 
(wiring harness-side) and body 
ground  



Are there continuity?  

Yes

Repair or replace suspected part, then go to 
Step 10.

No

Go to the next step.

7

INSPECT PCM CONNECTOR FOR POOR 
CONNECTION  



Turn the ignition switch off.  



Disconnect PCM 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 10.

No

Go to the next step.

8

INSPECT PCV VALVE HEATER 
CONTROL AND PCV VALVE HEATER 
FITTING FOR OPEN CIRCUIT  



Inspect for continuity between the 
following circuit: 



PCV valve heater control terminal 
B (wiring harness-side) and PCM 
terminal 2BL (wiring harness-side) 



PCV valve heater fitting B (wiring 

Yes Go to the next step.

No

Repair or replace suspected part, then go to 

Step 10.

 

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 251 

© 2005 Mitchell Repair Information Company, LLC. 

DTC P0579 [MZI-3.7] 

DTC P0579 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES 

harness-side) and PCM terminal 
2AU (wiring harness-side)  



Are there continuity?  

9

INSPECT PCV VALVE HEATER 
CONTROL AND PCV VALVE HEATER 
FITTING  



Inspect the PCV valve heater control and 
PCV valve heater fitting. 

(See POSITIVE CRANKCASE 
VENTILATION (PCV) VALVE 
INSPECTION [MZI-3.7] .) 

(See POSITIVE CRANKCASE 
VENTILATION (PCV) VALVE 
HEATER FITTING INSPECTION 
[MZI-3.7] .) 



Is there any malfunction?  

Yes

Replace the malfunctioning part, then go to 
the next step.

No

Go to the next step.

10

VERIFY TROUBLESHOOTING OF DTC 
P053A 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.

11

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 P0579

Cruise control multi-function input circuit range/performance

DETECTION 



P0579 may set when the cruise control switch circuits are open, shorted to 

 

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 252 

© 2005 Mitchell Repair Information Company, LLC.