Mazda 6 Service Manual: No.20 noise occurs at idle when vehicle is stopped in all positions/ranges

No.19 excessive shift shock on torque converter clutch (tcc)

No.21 noise occurs at idle when vehicle is stopped in d, s, l ranges, or in r position

Other materials:

Mazda 6 Service Manual: Clutch cover inspection
1. Measure the wear of the diaphragm spring fingers. If not as specified, replace the clutch cover. Depth 0.6 mm {0.024 in} max. 2. Measure the flatness of the pressure plate with a straight edge and a feeler gauge. If not as specified, replace the clutch cover. Maximum ...

Mazda 6 Service Manual: Setting the System
When the MODE switch is pressed, the Mazda Radar Cruise Control (MRCC) main indication (white) turns on and the vehicle speed and the distance between vehicles while in headway control can be set. NOTE When the ignition is switched to ACC or OFF while the Mazda Radar Cruise Control (MR ...