Component Description

Introduction

Component Descriptions
The torque converter:
Acts as a fluid coupling between the engine and transmission geartrain.
Provides multiplication of engine torque.
Consists of an impeller, turbine and stator, housed within a converter cover.
Has a lock-up clutch with variable slip control.
The transmission casing:
Houses the geartrain and electro-hydraulic control unit.
Contains the input speed sensor which measures turbine speed.
Contains the output speed sensor which measures the transmission output speed.
Contains the hydraulic system pump.
Contains the fluid temperature sensor.
The epicyclic geartrain:
Provides five forward gears and Reverse.
Has hydraulically actuated, multi-disk clutches, to select the required gear ratios.
Features clutch-to-clutch operation to permit gear shifts for uninterrupted power flow.
The electro-hydraulic control unit:
Is located in the lower part of the unit, within the fluid pan.
Is controlled by the Transmission Control Module (TCM), and the manual selector valve which is cable operated.
Regulates the flow of fluid to the geartrain clutches via three solenoid-operated valves and the manual selector valve.
Has five pressure regulators for controlling fluid pressures within the system.
Is connected to the TCM via a 16-way connector mounted on the left-hand side of the transmission casing. Refer to Connector Pins Identification.
The hydraulic system pump:
Is located at the front of the transmission casing.
Is driven from the impeller hub, pressurizing the fluid whenever the engine is running.
Supplies fluid under pressure to the torque converter, geartrain, electro-hydraulic control unit and the lubrication circuit.
Draws fluid from the fluid pan below the transmission casing, through a filter.
The rear extension housing:
Is bolted to the rear of the transmission casing.
Provides the rear engine/transmission mounting point.
Carries the transmission output shaft oil seal.