Overhaul - V4AW3: Description

Automatic transmission is a 4-speed electronically controlled transmission. Solenoids that control shift changes are located in valve body. Transmission consists of lock-up torque converter, overdrive (OD) clutch, direct clutch, forward clutch, 3 planetary gears, hydraulic control system and electronic control system. See Fig 2 .

Solenoids are controlled by a Transmission Control Module (TCM). For electronic diagnosis, see appropriate ELECTRONIC CONTROLS article. The TCM receives information from various input devices and uses this information to control shift solenoids for transmission shifting and lock-up solenoid for torque converter lock-up.

An Overdrive (OD) switch is mounted on the shift lever. When OD switch is depressed to ON position, transmission will shift into 4th gear when shift lever is in "D" position, and OD OFF light on instrument panel will go off. When OD switch is released to OFF position, transmission will shift into 3rd gear, and OD OFF light on instrument panel will illuminate.

A pattern select switch is located near shift lever on center console. Pattern select switch contains a POWER (PWR) and a HOLD operating position. When pattern select switch is depressed (PWR position), transmission upshifts and downshifts will occur at a higher vehicle speed than with switch released. An indicator light on instrument panel indicates pattern select switch is in PWR (on) position.

Transmission is equipped with a shift lock and key interlock system. Shift lock system prevents shift lever from being moved from Park unless brake pedal is depressed. Key interlock system prevents ignition key from being moved from ACC to LOCK position on ignition switch unless shift lever is in Park.