Content .. 300 301 302 303 ..

Mazda CX-9 Grand Touring. Manual - part 302



Turn the ignition switch 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 continuity?

Yes

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

Go to the next step.

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 9.

Go to the next step

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



Are there continuity?

Yes Go to the next step.

Repair or replace suspected part, then go to

Step 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

Yes

Replace the malfunctioning part, then 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 341

DTC P1464 [MZI-3.7]

DTC P1464 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

DIAGNOSTIC PROCEDURE

DTC P1464 (MZI-3.7) DIAGNOSTIC PROCEDURE

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



Is there any malfunction?

Go to the next step.

VERIFY TROUBLESHOOTING OF DTC
P145E 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] .)

Go to the next step.

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].)

Troubleshooting completed.

DTC P1464

A/C demand out of self-test range

DETECTION

CONDITION



The DTC sets when the PCM receives a request for A/C during the
self-test.

POSSIBLE CAUSE



A/C or defrost on during self-test



A/C relay circuit short to voltage



A/C switch malfunction



A/C relay malfunction

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED



Has FREEZE FRAME DATA been

Yes Go to the next step.

Record FREEZE FRAME DATA on the repair

2008 Mazda CX-9 Grand Touring

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

Microsoft

Sunday, November 15, 2009 10:08:41 AM

Page 342

recorded?

order, then go to the next step.

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.

Go to the next step.

VERIFY A/C AND DEFROST ARE OFF
DURING SELF-TEST



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



Are the A/C and defrost off during the
self-test?

Yes Go to the next step.

No Turn the A/C and defrost off. Then go to Step 5.

INSPECT ACCS PID



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



A/C and defroster OFF.



Access the PCM and monitor the
ACCS PID.



Is the PID state ON?

Yes

The ACCS PID indicates that the PCM is being
requested to turn on the A/C. Inspect the A/C
system.
(See DIAGNOSTIC TROUBLE CODE
NUMBER INSPECTION .) Then go to the
next step.

The ACCS PID indicates that the ACCS input to

the PCM is low. Go to the next step.

VERIFY TROUBLESHOOTING OF
DTC P1464 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] .)

Go to the next step.

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].)

Troubleshooting completed.

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 343

DTC P1500 [MZI-3.7]

DTC P1500 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES

DIAGNOSTIC PROCEDURE

DTC P1500 (MZI-3.7) DIAGNOSTIC PROCEDURE

DTC P1500

Vehicle speed signal

DETECTION

CONDITION



Indicates the VSS input signal was intermittent. This DTC is set when a VSS
concern interferes with other OBD tests, such as the catalyst efficiency
monitor, the EVAP monitor, or the HO2S monitor.

POSSIBLE

CAUSE



Intermittent sensor connections



Intermittent open in the sensor wiring harness circuit(s)



Intermittent short in the sensor wiring harness circuit(s)



Sensor malfunction

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED



Has FREEZE FRAME DATA been
recorded?

Yes Go to the next step.

Record FREEZE FRAME DATA on the repair

order, then go to the next step.

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.

Go to the next step.

VERIFY STORED DTC IN DSC/RSC
HU/CM



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



Verify stored DTCs in DSC/RSC
HU/CM.



Are DTCs stored?

Yes

Go to the appropriate DTC inspection. (See ON-
BOARD DIAGNOSIS [DSC/RSC] .)

Go to the next step.

VERIFY TROUBLESHOOTING OF
DTC P1500 HAS BEEN COMPLETED



Verify that all disconnected
connectors reconnected.



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

Yes

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

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 344

Content .. 300 301 302 303 ..