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 disc inspection
1. Using vernier calipers, measure the thickness of the lining at a rivet head on both sides. Replace the clutch disc if its thickness is less than the minimum. Thickness 0.3 mm {0.012 in} min. 2. Measure the clutch disc runout using a dial indicator. If the runout is excessiv ...

Mazda 6 Service Manual: Operational Range
The system operates only when the driver is in the vehicle or within operational range while the key is being carried. Starting the Engine NOTE Starting the engine may be possible even if the key is outside of the vehicle and extremely close to a door and window, however, always start the ...