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: Base removal
1. Remove the rearview mirror.
2. Wind each end of a wire around a bar.
Warning
Using a SST (piano wire) with bare hands can cause injury. Always
wear gloves when using a SST (piano wire).
Note
Use a long sawing action to spread the work over the whole length
of the SST (piano w ...
Mazda 6 Service Manual: Egr valve inspection
Operation Test
Carry out the EGR Control Inspection. (See EGR Control System
Inspection.
If not as specified, perform the further inspection for the EGR valve.
Resistance Inspection
Note
Perform the following test only when directed.
1. Disconnect the negative battery cable.
2. In ...