Transmission Description - Overview: Overview
This transmission uses planetary gears with hydraulic electronic controls.
This transmission has the following features:
- Six forward speeds
- Torque converter with an integral converter clutch
- Electronic shift and pressure controls
- Single planetary gear set
- Double planetary gear set
- Two fixed multi-disc clutches
- Three multi-plate clutches
All hydraulic functions are directed by electronic solenoids to control the following:
- Engagement feel
- Shift feel
- Shift scheduling
- Modulated TCC applications
This transmission has a main control unit which contains:
- TSS sensor
- OSS sensor
- An integral transmission range sensor
- TFT sensor
Engine power reaches the transmission by a torque converter with an integral clutch. The 6 forward gears and one reverse gear are obtained from 2 planetary gearsets.
Gear selection is achieved by the control of automatic transmission fluid flow to operate various internal clutches. The PCM operates the electrical components and provides for the control of gear selection shift pressure, which increases refinement and torque converter slip.
In the event of a system fault, the PCM also provides for Failure Mode Effect Management to maintain maximum functional operation of the transmission with a minimum reduction in driver, passenger or vehicle safety. In the event of a total loss of control or electrical power, the basic transmission functions P, R, N and D are retained. Also 3rd or 5th gear is retained by the hydraulic system. The gear retained is dependent upon the gear selected at the time of the failure.
This transmission has an internal thermal bypass valve contained within the case.