1. Remove the drive belt. (See DRIVE BELT REPLACEMENT.)
2. Verify that the drive belt auto tensioner moves smoothly in the operational direction.

3. Turn the drive belt auto tensioner pulley by hand and verify that it rotates smoothly.
4. Install the drive belt. (See DRIVE BELT REPLACEMENT.)
Drive belt replacement
Valve clearanceMazda 6 Service Manual: Engine coolant temperature (ect) sensor inspection
Note
Perform the following inspection only when directed.
ECT Sensor Resistance Inspection
1. Drain the engine coolant. (See COOLING SYSTEM SERVICE WARNINGS.)
2. Remove the ECT sensor (located above the starter).
3. Place the ECT sensor in water with a thermometer, and heat the water
gra ...
Mazda 6 Service Manual: Air bag module and pre-tensioner seat belt disposal procedures
Warning
Before scrapping a vehicle with a live (undeployed) air bag module
and pre-tensioner seat belt, deploy the air bag module and pre-tensioner
seat belt. Never dispose of a live (undeployed) air bag module and pre-tensioner
seat belt.
The air bag module and the pre-tensioner seat ...