Automatic Transmission Overhaul - M5DA: Description
Automatic transaxle is electronically controlled with 4 forward speeds and one reverse speed. Transaxle consists of clutches, mainshaft, countershaft, shift control solenoid valves, lock-up control solenoid valves, linear solenoid and lock-up torque converter. Transaxle has a differential assembly bolted to the transaxle. Power is delivered from transaxle to the differential assembly by the extension shaft. See Fig 1.
Lower valve body assembly consists of main valve body, secondary valve body, throttle valve body, linear solenoid, shift control solenoid valves and oil passage body. Lower valve body is bolted to transaxle housing. Other valve bodies used are regulator valve body, oil pump body and accumulator body. These valve bodies are bolted to torque converter housing.
Transaxle shifting and torque converter lock-up are controlled by the Powertrain Control Module (PCM). PCM is located under carpet on passenger's side foot well. Transaxle shifting is related to engine torque through the linear solenoid used to operate the throttle valve. The PCM controls the linear solenoid located on the throttle valve body. The PCM determines appropriate shift point and activates proper shift control solenoid valve for transaxle shifting.