Procedure Of ATF Level Adjusting

Park the vehicle on a flat road and lock the tires.
Shift the shift lever to the "P" range.
Remove the overflow plug (A) and the O-ring by using a torx wrench (T40).

Fig 1: Identifying Overflow Plug And O-Ring
Courtesy of HYUNDAI MOTOR CO.
Remove the filler plug (A) and the O-ring by using a torx wrench (T55).
NOTE: In case, remove the air cleaner assembly.

Fig 2: Identifying Filler Plug And O-Ring
Courtesy of HYUNDAI MOTOR CO.
Check if ATF drops from the overflow hole. If ATF does not drop, add ATF until it drops.
Fix the overflow plug with the used O-ring by using Torx wrench (T40).
Add 600cc of ATF from the oil filling hole.
Coat the new O-ring with ATF, and install it to the filler plug.
O-ring size: inner dia.-15.41 mm, thickness-2.21 mm
Tighten the filler plug by using Torx (T55) wrench with the specified torque.
TORQUE : 24-56 Nm (2.4-5.6 kgf.m, 17.4-40.5 lb.ft)
Start the engine.
Raise ATF temperature on CAN signal up to 50~60°C at stabilized idle speed condition.
Shift from "P" to "D", then from "D" to "P", keeping each shift position "N", "R" more than 2 seconds with foot braking.
Repeat 2 times above procedure "3".
Remove the overflow plug and the O-ring by using Torx wrench (T40).
Check If the thin oil stream becomes drop by drop when ATF temperature on CAN signal is at 50~60°C.
Coat the new O-ring with ATF, and install it to the overflow plug.
O-ring size: inner dia.-15.41mm, thickness-2.21 mm
Tighten the overflow plug by using Torx (T40) wrench with the specified torque.
TORQUE : 6-9 Nm (0.6-0.9 kgf.m, 4.3-6.5 lb.ft)

NOTE: Be sure to wipe off spilled ATF completely after tightening the overflow plug.