Non-Turbo Models

The electro-hydraulic control system for the transmission and transfer consists of various sensors and switches, a transmission control module (TCM) and the hydraulic controlling units including solenoid valves. The system controls the automatic transmission operation, including gear shifting, lock-up clutch operation, line pressure, automatic control pattern selection ("BASE" and "POWER"), and gear-shift timing. It also controls the operation of the transfer clutch. The TCM determines vehicle operating conditions from various input signals and controls a total of eight solenoids (shift solenoids 1 and 2, low clutch timing solenoid, 2-4 brake timing solenoid, line pressure duty solenoid, lockup duty solenoid, transfer duty solenoid, and 2-4 brake duty solenoid) by sending appropriate signals to them.

Fig 1: Identifying Electro-Hydraulic Control System Flow Chart (Non-Turbo Models) Vehicles Without VDC System & Sports Shift

Courtesy of SUBARU OF AMERICA, INC.

The electro-hydraulic control system for the transmission and transfer consists of various sensors and switches, a transmission control module (TCM) and the hydraulic controlling units including solenoid valves. The system controls the automatic transmission operation, including gear shifting, lock-up clutch operation, line pressure, automatic control pattern selection ("BASE" and "POWER"), and gear-shift timing. It also controls operation of the transfer multi-plate clutch (LSD). The TCM determines vehicle operating conditions from various input signals and controls a total of eight solenoids (shift solenoids 1 and 2, low clutch timing solenoid, 2-4 brake timing solenoid, line pressure duty solenoid, lockup duty solenoid, transfer duty solenoid, and 2-4 brake duty solenoid) by sending appropriate signals to them.

Fig 2: Identifying Electro-Hydraulic Control System Flow Chart (Non-Turbo Models) Vehicles With VDC System

Courtesy of SUBARU OF AMERICA, INC.

The electro-hydraulic control system for the transmission and transfer consists of various sensors and switches, a transmission control module (TCM) and the hydraulic controlling units including solenoid valves. The system controls the automatic transmission operation, including gear shifting, lock-up clutch operation, line pressure, automatic shift pattern selection (BASE and POWER), and gear-shift timing. It also controls the operation of the transfer clutch. The TCM determines vehicle operating conditions from various input signals and controls a total of eight solenoids (shift solenoids 1 and 2, low clutch timing solenoid, 2-4 brake timing solenoid, line pressure duty solenoid, lockup duty solenoid, transfer duty solenoid, and 2-4 brake duty solenoid) by sending appropriate signals to them. A sports shift solenoid is also equipped to make engine braking effect available when 1st speed gear is selected in sports shift mode.

Fig 3: Identifying Electro-Hydraulic Control System Flow Chart (Non-Turbo Models) Vehicles With Sports Shift

Courtesy of SUBARU OF AMERICA, INC.