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: Diagnostic trouble code number inspection
1. Remove the glove compartment. 2. Short the A/C check connector to the GND terminal using a jumper wire. 3. Shine a 60 W incandescent light from a height of approximately 100 mm {3.9 in} onto the solar radiation sensor. Note When incandescent light does not shine on the solar radiatio ...

Mazda 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 ...