Lock-Up Solenoid (NA4A-Hl)
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1994 Mazda MX-5 Miata, 1992 Mazda MX-5 Miata, 1992 Mazda MPV, 1992 Mazda B2200, and 1991 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.
Apply 12 volts to solenoid. Oil passage should close. Oil passage should open when voltage is removed. See Fig 1 .