Mazda CX-9 Grand Touring. Manual — part 201

1. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7] .)

2. Remove in the order indicated in the table.

Fig. 13: Identifying Purge Solenoid Valve & Torque Specifications
Courtesy of MAZDA MOTORS CORP.

3. Install in the reverse order of removal.

PURGE SOLENOID VALVE INSPECTION [MZI-3.7]

AIRFLOW INSPECTION

1. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7] .)

2. Disconnect the quick release connector from the purge solenoid valve. (See QUICK RELEASE

CONNECTOR (EMISSION SYSTEM) REMOVAL/INSTALLATION [MZI-3.7].)

3. Remove the purge solenoid valve. (See PURGE SOLENOID VALVE REMOVAL/INSTALLATION

[MZI-3.7].)

4. Verify that the airflow is as indicated in the table.



If as specified in the table, perform the "Circuit Open/Short Inspection".



If not as specified in the table, inspect the purge solenoid valve.

CONTINUITY CHART

Measured condition

Continuity between A-B

When voltage is not applied between terminals A and B

No airflow

When voltage is applied between terminals A and B

Airflow detected

2008 Mazda CX-9 Grand Touring

2008 ENGINE PERFORMANCE Emission System (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:04:04 AM

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© 2005 Mitchell Repair Information Company, LLC.

Fig. 14: Identifying Purge Solenoid Valve Connector
Courtesy of MAZDA MOTORS CORP.

CIRCUIT OPEN/SHORT INSPECTION

1. Disconnect the PCM connector.

2. Inspect the following wiring harness for an open or short circuit (continuity check).

Fig. 15: Identifying Purge Solenoid Valve Wiring Harness-Side Connector
Courtesy of MAZDA MOTORS CORP.

Fig. 16: Identifying PCM Wiring Harness-Side Connector
Courtesy of MAZDA MOTORS CORP.

2008 Mazda CX-9 Grand Touring

2008 ENGINE PERFORMANCE Emission System (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:04:04 AM

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© 2005 Mitchell Repair Information Company, LLC.

Fig. 17: Identifying PCV Valve Heater Control
Courtesy of MAZDA MOTORS CORP.

Open circuit



If there is no continuity, the circuit is open. Repair or replace the harness.



Purge solenoid valve terminal A and main relay No.1 terminal D



Purge solenoid valve terminal B and PCM terminal 1 BC

Short circuit



If there is continuity, the circuit is short. Repair or replace the harness.



Purge solenoid valve terminal A and power supply



Purge solenoid valve terminal A and body ground



Purge solenoid valve terminal B and power supply



Purge solenoid valve terminal B and body ground

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

AIRFLOW INSPECTION

1. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7] .)

2. Disconnect the PCV valve hose from the PCV valve. (See POSITIVE CRANKCASE VENTILATION

(PCV) VALVE REMOVAL/INSTALLATION [MZI-3.7].)

3. Verify that there is no airflow when pressure is applied to the PCV valve using a vacuum pump.

NOTE:



The PCV valve cannot be reassembled once it is removed because the
tabs will have been broken. Inspect the PCV valve without removing it
from the vehicle.

2008 Mazda CX-9 Grand Touring

2008 ENGINE PERFORMANCE Emission System (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:04:04 AM

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© 2005 Mitchell Repair Information Company, LLC.



If there is airflow, replace the PCV valve. (See POSITIVE CRANKCASE VENTILATION
(PCV) VALVE REMOVAL/INSTALLATION [MZI-3.7].)

4. Verify that there is airflow when vacuum is applied to the PCV valve.



If there is no airflow, replace the PCV valve. (See POSITIVE CRANKCASE VENTILATION
(PCV) VALVE REMOVAL/INSTALLATION [MZI-3.7].)

RESISTANCE INSPECTION

1. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7] .)

2. Remove the engine cover. (See ENGINE COVER REMOVAL/INSTALLATION [MZI-3.7] .)

3. Disconnect the PCV valve heater control connector.

4. Measure the resistance between the PCV valve heater control terminals.



If within the specification, perform out the "Circuit Open/Short Inspection".



If not within the specification, replace the PCV valve. (See POSITIVE CRANKCASE
VENTILATION (PCV) VALVE REMOVAL/INSTALLATION [MZI-3.7].)

PCV valve heater control resistance 10-35 ohm

Fig. 18: Identifying PCV Valve Heater Control Connector Terminals
Courtesy of MAZDA MOTORS CORP.

CIRCUIT OPEN/SHORT INSPECTION

1. Disconnect the PCM connector.

2. Inspect the following wiring harnesses for open or short circuit (continuity check).

2008 Mazda CX-9 Grand Touring

2008 ENGINE PERFORMANCE Emission System (MZI-3.7) - Mazda CX-9

Microsoft

Sunday, November 15, 2009 10:04:04 AM

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© 2005 Mitchell Repair Information Company, LLC.