Overhaul - MPYA: 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 pass body. Lower valve body is bolted to transaxle housing. Other valve bodies used are regulator valve body, oil pump body and accumulator body. These bodies are bolted to torque converter housing.
Transaxle shifting and torque converter lock-up are controlled by the PGM-FI/AT Electronic Control Unit (ECU). Transaxle shifting is related to engine torque through the linear solenoid used to operate the throttle valve. The ECU controls the linear solenoid located on the throttle valve body. The ECU determines appropriate shift point and activates proper shift control solenoid valve for transaxle shifting.