Mazda CX-9 Grand Touring 2009 Manual page 1019

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
ENGINE CONTROL SYSTEM
OPERATION INSPECTION
[MZI-3.7] .)
Does the variable timing control
system work properly?
INSPECT OPERATION OF PURGE
SOLENOID VALVE
Inspect the purge control system
operation. (See ENGINE
15
CONTROL SYSTEM
OPERATION INSPECTION
[MZI-3.7] .)
Does the purge control system work
properly?
INSPECT PCV VALVE OPERATION
Turn the ignition switch off.
Remove the PCV valve and check
16
the valve operation. (See POSITIVE
CRANKCASE VENTILATION
(PCV) VALVE INSPECTION
[MZI-3.7] .)
Is the PCV valve operation normal?
INSPECT SEALING OF ENGINE
COOLANT PASSAGE
WARNING:
Never remove the cooling system
cap or loosen the radiator drain
plug while the engine is running, or
when the engine and radiator are
hot. Scalding engine coolant and
steam may shoot out and cause
serious injury. It may also damage
17
the engine and cooling system.
Turn off the engine and wait until it
is cool. Even then, be very careful
when removing the cap. Wrap a
thick cloth around it and slowly
turn it counterclockwise to the first
stop. Step back while the pressure
escapes
When you are sure all the pressure
is gone, press down on the cap
using the cloth, turn it, and remove
it.
2008 Mazda CX-9 Grand Touring
Repair or replace the malfunctioning part
No according to the variable valve timing control
system inspection results, then go to Step 18.
Yes Go to the next step.
Repair or replace the malfunctioning part
No according to the purge control system inspection
Yes Replace the PCV valve, then go to Step 18.
No
Air penetrates due to poor sealing of the head
gasket or other areas between the combustion
Yes chamber and the engine coolant passage. Repair
or replace malfunctioning parts, then go to the
next step.
results, then go to Step 18.
Go to the next step.