Mazda CX-9 Grand Touring. Manual — part 202

Fig. 19: Identifying PCV Valve Heater Control Wiring Harness Side Connector
Courtesy of MAZDA MOTORS CORP.

Fig. 20: Identifying Fuse Box (Main Relay No.1)
Courtesy of MAZDA MOTORS CORP.

Fig. 21: Identifying PCM Wiring Harness Side Connector
Courtesy of MAZDA MOTORS CORP.

Open circuit

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



PCV valve heater control terminal A and main relay No.1 terminal D



PCV valve heater control terminal B and PCM terminal 2BL

Short circuit



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



PCV valve heater control terminal A and power supply



PCV valve heater control terminal A and body ground



PCV valve heater control terminal B and power supply



PCV valve heater control terminal B and body ground

POSITIVE CRANKCASE VENTILATION (PCV) VALVE
REMOVAL/INSTALLATION [MZI-3.7]

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

2. Remove in the order indicated in the table.

CAUTION:



A new PCV valve must be installed if removed from the cylinder head
cover.



Upon removal, damage will occur to the locking mechanism on the
PCV valve.

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. 22: Identifying PCV Valve Hose, PCV Valve Heater Control Connector, PCV Valve And O-
Ring
Courtesy of MAZDA MOTORS CORP.

3. Install in the reverse order of removal.

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

RESISTANCE INSPECTION

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

2. Disconnect the PCV valve heater fitting connector.

3. Measure the resistance between the PCV valve terminals.



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



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

PCV valve heater fitting resistance 10-35 ohms

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

Page 17

© 2005 Mitchell Repair Information Company, LLC.

Fig. 23: Identifying PCV Valve Heater Connector Terminal
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).

Fig. 24: Identifying PCV Valve Heater Control Wiring Harness Side Connector
Courtesy of MAZDA MOTORS CORP.

Fig. 25: Identifying Fuse Box (Main Relay No.1)
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

Page 18

© 2005 Mitchell Repair Information Company, LLC.