Overhaul - Ax4S Automatic Transmission: Description
The AX4S combines an automatic transaxle and differential into a single unit designed for front wheel drive vehicles. The transaxle is an electronically controlled, fully automatic unit with 4 forward speeds, one Reverse, Neutral and Park. Shift control solenoids provide gear selection and are controlled by Powertrain Control Module (PCM). The AX4S has 2 planetary gear sets and a combination planetary/differential gear set. Four multiple-plate clutches, 2 band assemblies, and 2 roller (one-way) clutches act as friction elements for operation of the planetary gear sets. See Fig 1.
A lock-up torque converter couples the engine output to the planetary gears and overdrive unit. This is done by a chain which connects the drive and driven sprockets. The converter lock-up is controlled by PCM. A piston plate clutch, inside converter, is activated through Torque Converter Clutch (TCC) solenoid by the PCM and valve body hydraulic pressure.