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: Windshield Defrosting and Defogging
Press the windshield defroster switch. In this position, the outside air position
is automatically selected, and the air conditioner automatically turns on. The air
conditioner will directly dehumidify the air to the front windshield and side windows.
Airflow amount will be increased.
WARNING
...
Mazda 6 Service Manual: Abs (abs/tcs) or dsc hu/cm configuration
1. Connect the WDS or equivalent to the DLC-2.
2. Input vehicle information following the direction on the WDS or equivalent
screen.
3. Select Module programming.
4. Select Programmable module installation.
5. Select ABS/TCS.
6. Retrieve DTCs by the WDS or equivalent, then verify that there ...