Transmission Control Systems: Description and Operation

DESCRIPTION

The AODE Transmission is an electronically controlled four speed automatic transmission. The Powertrain Control Module (PCM) uses input5 from various sensors to control the operation of the AODE Transmission. The Transmission Control Switch disables operation in fourth gear, allowing automatic operation through the first three gears. The AODE Transmission has self test capabilities much like those in other electronic control systems.

OPERATION

The PCM Power Relay supplies power to the PCM and PCM System-related components. When the Ignition Switch is turned to "RUN" or "START", voltage is applied to the PCM Power Relay coil, closing the relay's contacts.

Voltage is supplied to the Shift Solenoids, Electronic Pressure Control (EPC) Solenoid and the Torque Converter Clutch (TCC) Solenoid, through the PCM Power Relay.

The Throttle Position (TP) Sensor is a potentiometer. The sensor output is a DC voltage that varies with throttle angle. By monitoring the TP Sensor output, and other sensors, the PCM calculates the proper transmission line pressure, shift scheduling, and Torque Converter Clutch.