Avoiding Mazda shift shock

Feb. 23, 2024
Some owners of 2016 Mazda CX-9 vehicles may complain about a slight shift shock while accelerating.

Some owners of 2016 Mazda CX-9 vehicles may complain about a slight shift shock while accelerating from a stop and no A/T related DTCs are stored.

The shift shock actually occurs intermittently at lock-up transition with the A/C on. Improperly learned values in the TCM for the lock-up slip control may cause excessive pressure for the lock-up clutch.

To avoid improper learning, the logic control of the TCM has been changed.

Reboot the IDS to clear memory before reprogramming. Using IDS 103.3 or later software, reprogram the TCM to the latest calibration. Increase the ATF temperature by learning the engine at idling or city
driving.

Verify that the ATF temperature is between 151-230 degrees Fahrenheit. If the ATF temperature is outside this range, work to bring it inside the range. Do not raise ATF temperature by stalling the engine. With the vehicle standing still, depress the brake pedal and keep the selector lever in the Neutral position for three seconds.

Then shift the selector lever from Neutral into the Drive position, and maintain this condition for three seconds. Repeat this procedure five times. The repeat it again five times in the Reverse position. Verify that variable speed shock and shift shock have decreased compared to the conditions before learning.

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