Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSSUBARU1998LEGACY OUTBACK SPORT AWD F4-2.2L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSDESCRIPTION AND OPERATIONGENERAL SYSTEM DESCRIPTION
1998 Subaru Legacy Outback Sport AWD F4-2.2L SOHC
General System Description
1998 Subaru Legacy Outback Sport AWD F4-2.2L SOHCSECTION General System Description
GENERAL DESCRIPTION
The electronic-hydraulic control system consists of various sensors and switches, a transmission control module (TCM) and the hydraulic controller including solenoid valves. The system controls the transmission proper including shift control, lock-up control, overrunning clutch control, line pressure control, auto pattern select control and shift timing control. It also controls the all wheel drive (AWD) transfer clutch. The system detects various operating conditions from various input signals and sends output signals to shift solenoids 1, 2 and 3, and duty solenoids A, B and C.
INPUT SIGNALS
^ Throttle sensor
^ Vehicle speed sensor 1 (on transmission)
^ Vehicle speed sensor 2 (in speedometer)
^ Engine rpm
^ Inhibitor switch
^ Cruise control switch
^ ATF temperature sensor
^ Manual switch
^ FWD switch
^ ABS signal
OUTPUT SIGNALS
^ Shift solenoids 1, 2
^ Shift solenoid 3 (overrunning clutch)
^ Duty solenoid A (line pressure)
^ Duty solenoid B (lock-up)
^ Duty solenoid C (transfer pressure)
^ "Power" indicator light
^ FWD pilot light
^ "Manual" indicator light
The electronic-hydraulic control system consists of various sensors and switches, a transmission control module (TCM) and the hydraulic controller including solenoid valves. The system controls the transmission proper including shift control, lock-up control, overrunning clutch control, line pressure control, auto pattern select control and shift timing control. It also controls the all wheel drive (AWD) transfer clutch. The system detects various operating conditions from various input signals and sends output signals to shift solenoids 1, 2 and 3, and duty solenoids A, B and C.
INPUT SIGNALS
^ Throttle sensor
^ Vehicle speed sensor 1 (on transmission)
^ Vehicle speed sensor 2 (in speedometer)
^ Engine rpm
^ Inhibitor switch
^ Cruise control switch
^ ATF temperature sensor
^ Manual switch
^ FWD switch
^ ABS signal
OUTPUT SIGNALS
^ Shift solenoids 1, 2
^ Shift solenoid 3 (overrunning clutch)
^ Duty solenoid A (line pressure)
^ Duty solenoid B (lock-up)
^ Duty solenoid C (transfer pressure)
^ "Power" indicator light
^ FWD pilot light
^ "Manual" indicator light
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.