1. Verify that the joint shaft is not twisted or cracked.
2. Turn the joint shaft by hand and verify that the bearing rotates smoothly and freely.

Drive shaft
Joint shaft removal/installationMazda 6 Service Manual: Mazda Radar Cruise Control (MRCC) (Some models)
The Mazda Radar Cruise Control (MRCC) system is designed to maintain headway
control*1 according to the vehicle speed using a radar sensor (front) to detect
the distance to a vehicle ahead, and by presetting the vehicle speed between 30
km/h (19 mph) and 145 km/h (90 mph), the driver is freed ...
Mazda 6 Service Manual: To Decrease Cruising Speed
Press the SET/ switch and hold
it. The vehicle will gradually slow.
Release the switch at the desired speed.
Press the SET/ switch and release
it immediately to adjust the preset speed.
Multiple operations will decrease the preset speed according to the number of
times it is operated.
Decr ...