1. Disconnect the negative battery cable.
2. Remove the intake maniforld.(see INTAKE-AIR SYSTEM REMOVAL/INSTALLATION.)
3. Remove the PCV valve.
4. Blow through the valve and verify that air flows as specified.

Specification

Egr valve inspection
Three-way catalytic converter (twc) inspectionMazda 6 Service Manual: Power steering pressure (psp) switchinspection
Note
Perform the following inspection only when directed.
Continuity Inspection
1. Inspect the following if the power steering is inoperative (See POWER
STEERING FLUID INSPECTION.):
Power steering fluid level
Power steering fluid leakage
Power steering fluid pressure
2. Disconne ...
Mazda 6 Service Manual: Crash zone sensor removal/installation
Warning
Handling the crash zone sensor improperly can accidentally deploy the air bag
module and pre-tensioner seat belt, which may seriously injure you. Read AIR BAG
SYSTEM SERVICE WARNINGS before handling the crash zone sensor. (See SERVICE
WARNINGS.)
1. Turn the ignition switch to LO ...