1. Position the vehicle on level ground.
2. Remove the Insulator (except L8).
(See TRANSMISSION REMOVAL/INSTALLATION [M15M-D].)
3. Remove the check plug A.
4. Verify that the oil is at the brim of the check plug hole as shown.
5. Install the new check plug A.
6. Install the Insulator (except L8).
(See TRANSMISSION REMOVAL/INSTALLATION [M15M-D].)