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.