Automatic Transaxle Fluid (ATF) Condition Inspection
One way of determining whether the transaxle should be disassembled is by noting:
ATF Condition

Automatic Transaxle Fluid (ATF) Level Inspection
Caution
1. Park the vehicle on level ground.
2. Apply the parking brake and position wheel chocks securely to prevent the vehicle from rolling.
3. Adjust the length or thermistor probe to measure the same depth as the depth gauge and hold the probe with a paper holder. Insert into the filler tube and measure the temperature.

4. Warm up the engine until the ATF reaches 60-70 °C {140-158 ° F}.
5. Shift the selector lever and pause momentarily in each range (DL) while depressing the brake pedal.
6. Shift the selector lever to P position.
7. Verify that the ATF level is in the HOT range (65 °C{149 °F}) while the engine is idling.
ATF type
ATF M-V

Road test
Automatic transaxle fluid (atf) replacementMazda 6 Service Manual: Troubleshooting procedure
Basic flow of troubleshooting
DTC troubleshooting flow (on-board diagnostic)
Diagnostic trouble codes (DTCs) are important hints for repairing
malfunctions that are difficult to simulate.
Perform the specific DTC diagnostic inspection to quickly and accurately
diagnose the malfunction.
The ...
Mazda 6 Service Manual: Precaution
Vehicles with ABS/TCS
1. The ABS warning light, BRAKE system warning light, TCS indicator light
and/or TCS OFF light illuminate even when the system is normal.
*1 : In cases where the light may illuminate, only when ABS/TCS HU/CM detects
that speed sensor of rear wheel is malfunctioning.
*2 ...