IDENTIFICATION
Transmission is identified by transmission identification number. Transmission identification number is located on left side of transmission near transmission range switch. (Scheme 32) This number contains transmission type, production year, production month and serial number.
Scheme 32
DESCRIPTION
Transmission consists of a lock-up torque converter, oil pump, valve body assembly, 3 clutch assemblies, 3 planetary gear sets, 4 clutch style brakes and 3 one-way clutches.
The SB4A-EL (Aisin Warner AW03-72LE) 4-speed OD transmission is electronically controlled. Transmission shifting and torque converter lock-up are controlled by the Transmission Control Module (TCM), 2 shift solenoids and a lock-up solenoid. For electronic diagnosis, see MAZDA MIATA SB4A-EL ELECTRONIC CONTROLS article.
The TCM receives information from various input devices and uses this information to control torque converter lock-up solenoid, and both shift solenoids No. 1 and 2 on transmission valve body. Solenoids are responsible for transmission shifting and torque converter lock-up.