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: Instrument cluster inspection
Speedometer Using the input/output check mode Inspect the speedometer by setting it in the input/output check mode DTC 12. Using a speedometer tester 1. Adjust the tire air pressure to the specification. 2. Using a speedometer tester, verify that the speedometer indication is within the allow ...

Mazda 6 Service Manual: Dual proportioning valve inspection (without abs)
1. Connect the SSTs to the brake pipes as shown in the figure. 2. Bleed the air from the brake system. 3. Measure the fluid pressure of the master cylinder and the rear brake. If not within the specification, replace the dual proportioning valve. Fluid pressure ...