Overhaul - Ax4N Automatic Transmission: Description
The AX4N 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 the EEC-IV or EEC-V microprocessor. For additional information on the EEC-IV or EEC-V system, appropriate AUTOMATIC TRANSMISSIONS article.
The AX4N has 2 planetary gear sets and a combination final drive/planetary gear set. Five multiple-plate friction clutches, 2 band assemblies, and 3 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 forward and reverse geartrain. This is done by a chain which connects the drive and driven sprockets. The converter lock-up is controlled through the EEC-IV or EEC-V system Powertrain Control Module (PCM). A piston plate clutch, inside converter, is activated through Torque Converter Clutch (TCC) solenoid by the PCM and valve body hydraulic pressure.