Mazda CX-9 Grand Touring 2009 Manual page 1023

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Connect the noid light to the fuel injector
connector terminals.
Verify the light dimness during cranking.
Does the noid light illuminate?
INSPECT FUEL INJECTOR OPERATION
Remove fuel injector from the suspected
cylinder. (See FUEL INJECTOR
REMOVAL/INSTALLATION [MZI-3.7] .)
9
Swap the fuel injector with one from another
cylinder.
Start the engine and run it at idle.
Is there the misfire DTC for the cylinder
which has a suspected fuel injector?
INSPECT FOR AIR SUCTION AT INTAKE
AIR SYSTEM
Inspect for air leakage at the following:
Around the connection of the dynamic
10
chamber and the intake manifold
Around the connection of the intake
manifold and the cylinder head
Is air leakage found?
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 the
engine and cooling system.
11
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
No
Yes
No
Yes
No
Yes
Repair or replace if necessary, then go to
Step 13.
Replace fuel injector, then go to Step 13.
(See FUEL INJECTOR
REMOVAL/INSTALLATION [MZI-
3.7] .)
Go to the next step.
Repair or replace the suspected part, then
go to Step 13.
Go to the next step.
Air penetrates due to poor sealing of the
head gasket or other areas between the
combustion chamber and the engine
coolant passage. Repair or replace
malfunctioning parts, then go to Step 13.