1. Measure the temperature around the water temperature sensor.
2. Measure the resistance between terminals of the water temperature sensor.

Water temperature sensor removal/installation
Refrigerant pressure switch removal/installationMazda 6 Service Manual: Nonreturn valve inspection
1. Remove the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION.)
2. Siphon the fuel from the fuel tank.
Note
Nonreturn valve is integrated in the fuel tank.
The nonreturn valve is normally closed by the spring force.
3. Verify that the nonreturn valve is closed.
If the nonretu ...
Mazda 6 Service Manual: Front crossmember removal/installation
1. Remove the under cover.
2. Remove the splash shield.
3. Remove the front auto leveling sensor. (See FRONT AUTO LEVELING SENSOR
REMOVAL/INSTALLATION.)
4. Remove the transverse member. (See TRANSVERSE MEMBER
REMOVAL/INSTALLATION.)
5. Remove the steering gear and linkage, and pipe assembly i ...