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 it, and remove it.
NOTE:
If the “FL22” mark is shown on or near the cooling system cap, use Mazda Genuine FL22 engine coolant.

FL22 type engine coolant is shipped as a diluted solution. Use the solution as is when replacing coolant.
1. Remove the cooling system cap.
2. Verify that the engine coolant is filled close to the top of the radiator filler neck.
If the engine coolant level is low, add engine coolant.
3. Verify that the engine coolant level in the coolant reserve tank is between the F and L marks.

If the engine coolant level is below the L mark, add engine coolant.
Engine Coolant Leakage Inspection
Engine Coolant Protection InspectionOil Control Valve (OCV) [Skyactiv G 2.0]
Purpose, Function
The OCV switches the oil passage to the hydraulic variable valve timing actuator
to control the opening/closing period of the exhaust valve.
Construction
The OCV is installed to the exhaust camshaft cap (No.1).
The OCV consists of a spool valve wh ...
Coupling Component Calibration Data Writing
1. Connect the M-MDS to the DLC-2.
2. After the vehicle is identified, select the following items from the toolbox
of the M-MDS.
Select “Chassis”.
3. Then, select items from the screen menu in the following order.
Select “4WD/AWD”.
Select “Coupling Calibra ...
Positive Crankcase Ventilation (PCV) Valve Removal/Installation
1. Disconnect the negative battery cable..
2. Remove the intake manifold..
3. Remove in the order indicated in the table.
4. Install in the reverse order of removal.
1
PCV hose
2
Oil separator
3
Retainer
( ...