Mazda CX-9 Grand Touring 2009 Manual page 1186

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
repair information availability.
Is any related Service Bulletins available?
INSPECT COOLING SYSTEM
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.
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
3
it, and remove it.
NOTE:
If the electric cooling fan does not operate,
go to the applicable DTC inspection. (See
DTC TABLE [MZI-3.7].)
An engine overheat condition is sensed by the
CHT sensor.
Check the cooling system for:
Correct coolant level
Internal or external coolant leaks
Blockage of the radiator
Cooling fan operation
Is the cooling system normal?
INSPECT OPERATION OF THE CHT SENSOR
Run the engine until the engine temperature
stabilizes.
4
Verify the radiator hoses are hot and the
cooling system is pressurized.
Verify self-test DTCs.
Is DTC P1285 present?
INSPECT CHT SENSOR
2008 Mazda CX-9 Grand Touring
to the next step.
No Go to the next step.
Yes Go to the next step.
Repair if necessary. Then go to the next
No
step.
Yes Go to the next step.
An engine overheat temperature was
No not detected. Repair any other DTCs if
necessary.
Replace the CHT sensor, then go to the