Automatic Transmission Description
This automatic transmission is a full automatic type with 4-speed plus overdrive (O/D).
The torque converter is a 3-element, 1-step and 2-phase type and is equipped with an electronically controlled lock-up mechanism. The gear shift device consists of 3 sets of planetary gear units, 3 disc type clutches, 4 disc type brakes and 3 one-way clutches. The gear shift is done by selecting one of 6 positions ("P", "R", "N", "D", "3" and "L") by means of the select lever installed on the floor. On the shift knob, there is an overdrive (O/D) cut switch which allows shift-up to the overdrive mode (except at 4L) and shift-down from the overdrive mode. Also, by using the P/N change switch located on the console box, it is possible to select the gear change timing of 2 modes, normal and power.
This automatic transmission has the clutch-to-clutch (brake) control function when the gear is upshifted from the 4th gear to the 5th gear and downshifted from the 5th gear to the 4th gear. With this function, gears are synchronized by controlling the hydraulic pressure to the forward clutch and No. 1 brake without using the one-way clutch. This automatic transmission also has the line pressure learning control function to achieve gear changes smoothly. Therefore, when any of the following conditions applies, initialize the line pressure learning control of TCM referring to LEARNING CONTROL INITIALIZATION . Neglecting this initialization may cause excessive shift shock.
- The A/T unit has been overhauled
- The A/T unit has been replaced
- The engine has been overhauled
- The engine has been replaced
- ECM has been replaced with used one