Mazda CX-9 Grand Touring 2009 Manual page 804

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