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: Solenoid valve inspection
Resistance Inspection (On-Vehicle Inspection)
Caution
Water or foreign objects entering the connector can cause a poor
connection or corrosion. Be sure not to drop water or foreign objects on the
connector when disconnecting it.
1. Disconnect the negative battery cable.
2. Remove the ...
Mazda 6 Service Manual: Oil pump
OIL PUMP REMOVAL/INSTALLATION
1. Disconnect the negative battery cable.
2. Drain the engine oil. (See ENGINE OIL REPLACEMENT.)
3. Remove the oil pan. (See OIL PAN REMOVAL/INSTALLATION.)
4. Remove in the order indicated in the table.
5. Install in the reverse order of removal.
6. Inspect the en ...