Mazda CX-9 Grand Touring 2009 Manual page 806

2008 ENGINE PERFORMANCE Emission System (MZI-3.7) - Mazda CX-9
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]
CAUTION:
1. Disconnect the negative battery cable. (See BATTERY REMOVAL/INSTALLATION [MZI-3.7] .)
2. Remove in the order indicated in the table.
2008 Mazda CX-9 Grand Touring
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.