Automatic Transmission/Transaxle: Description and Operation

GENERAL SYSTEM OPERATION
The Powertrain Control System consists of various sensors, switches, Powertrain Control Module Engine (PCME) and Powertrain Control Module Transaxle (PCMT). The sensors and switches act as inputs to the Control Modules.

The sensors and switches (inputs) send the Control Modules data concerning engine and transaxle operating conditions. The Control Modules share and interpret this data in order to control various output devices. The output devices control deceleration, automatic transaxle (ATX) shifting and torque converter lockup operation. The Control Modules have varying amounts of control over these (outputs).

By controlling these outputs, the Control Modules can meet the different operational and driveability needs of the engine and transaxle as they experience different operating conditions and requirements.


Transaxle Control System Inputs
- Automatic transaxle fluid (ATF) thermosensor
- Data link connector TAT terminal (self diagnosis checker)
- Hold switch
- Park/neutral switch
- Powertrain control module engine (torque reduced signal/water temp. signal)
- Stop light switch
- Throttle position sensor
- Vehicle speed sensor (signal buffer)
- Vehicle speed pulse generator

Transaxle Control System Outputs
- Data link connector FAT terminal (self diagnosis checker output)
- Hold indicator light
- Inhibitor signal (to PCME)
- Powertrain control module engine (reduce torque signal 1)
- Powertrain control module engine (reduce torque signal 2)
- 1-2 shift solenoid valve
- 2-3 shift solenoid valve
- 3-4 shift solenoid valve
- Lock up solenoid valve