Page 2705 of 2870

4AT(H4DOTC)-129
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Symptom Related Diagnostic
Slippage occurs from 1st to 2nd gear.TCM
Accelerator pedal position sensor
2-4 brake duty solenoid
ATF temperature sensor
Line pressure linear solenoid
Control valve
2-4 brake
Shock occurs from 2nd to 3rd gear.TCM
Torque converter turbine speed sensor
Accelerator pedal position sensor
2-4 brake duty solenoid
ATF temperature sensor
Line pressure linear solenoid
Low & reverse duty solenoid
Control valve
High clutch
2-4 brake
ATF deterioration
Engine performance
High clutch duty solenoid
Slippage occurs from 2nd to 3rd gear.TCM
Accelerator pedal position sensor
2-4 brake duty solenoid
ATF temperature sensor
Line pressure linear solenoid
Control valve
High clutch
2-4 brake
Low & reverse duty solenoid
Shock occurs from 3rd to 4th gear.TCM
Torque converter turbine speed sensor
Accelerator pedal position sensor
2-4 brake duty solenoid
ATF temperature sensor
Line pressure linear solenoid
Control valve
Low clutch duty solenoid
2-4 brake
ATF deterioration
Engine performance
Slippage occurs from 3rd to 4th gear.TCM
Accelerator pedal position sensor
2-4 brake duty solenoid
ATF temperature sensor
Line pressure linear solenoid
Control valve
2-4 brake
Shock occurs when select lever is shifted from “3” to “2” range.TCM
Torque converter turbine speed sensor
Accelerator pedal position sensor
ATF temperature sensor
Line pressure linear solenoid
Control valve
2-4 brake duty solenoid
2-4 brake
ATF deterioration
High clutch duty solenoid Symptom Problem parts
Page 2706 of 2870

4AT(H4DOTC)-130
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Symptom Related Diagnostic
Shock occurs when select lever is shifted from “D” to “1” range.TCM
Torque converter turbine speed sensor
Accelerator pedal position sensor
ATF temperature sensor
Line pressure linear solenoid
Control valve
ATF deterioration
Low & reverse brake duty solenoid
Low & reverse clutch solenoid
Shock occurs when select lever is shifted from “2” to “1” range.TCM
Torque converter turbine speed sensor
Accelerator pedal position sensor
ATF temperature sensor
Line pressure linear solenoid
Control valve
Low & reverse clutch
ATF deterioration
2-4 brake duty solenoid
Low & reverse brake duty solenoid
Shock occurs when accelerator pedal is released at medium
speeds.TCM
Accelerator pedal position sensor
ATF temperature sensor
Line pressure linear solenoid
Control valve
Lock-up damper
Engine performance
Vibration occurs during straight-forward operation.TCM
Lock-up duty solenoid
Lock-up facing
Lock-up damper
HOLD switch
Vibration occurs during turns (tight corner “braking” phenome-
non).TCM
Front vehicle speed sensor
Rear vehicle speed sensor
Accelerator pedal position sensor
ATF temperature sensor
Transfer clutch
Transfer valve
Transfer duty solenoid
ATF deterioration
Harness
HOLD switch
Front wheel slippage occurs during standing starts.TCM
Front vehicle speed sensor
Accelerator pedal position sensor
ATF temperature sensor
Control valve
Transfer clutch
Transfer valve
Transfer pipe
Transfer duty solenoid
Vehicle is not set in FWD mode.TCM
Transfer clutch
Transfer valve
Transfer duty solenoid
Select lever is hard to move. Select cable
Select lever
Detente spring
Manual plate Symptom Problem parts
Page 2707 of 2870
4AT(H4DOTC)-131
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Symptom Related Diagnostic
Select lever is too high to move (unreasonable resistance). Detente spring
Manual plate
Select lever slips out of operation during acceleration or while
driving on rough terrain. Select cable
Select lever
Detente spring
Manual plate Symptom Problem parts
Page 2708 of 2870
4AT(H4DOTC)-132
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Symptom Related Diagnostic
Page 2709 of 2870

FUJI HEAVY INDUSTRIES LTD. G8080GE5
2004 FORESTER SERVICE MANUAL QUICK REFERENCE INDEX
TRANSMISSION SECTION
This service manual has been prepared
to provide SUBARU service personnel
with the necessary information and data
for the correct maintenance and repair
of SUBARU vehicles.
This manual includes the procedures
for maintenance, disassembling, reas-
sembling, inspection and adjustment of
components and diagnostics for guid-
ance of experienced mechanics.
Please peruse and utilize this manual
fully to ensure complete repair work for
satisfying our customers by keeping
their vehicle in optimum condition.
When replacement of parts during
repair work is needed, be sure to use
SUBARU genuine parts.
All information, illustration and specifi-
cations contained in this manual are
based on the latest product information
available at the time of publication
approval.CONTROL SYSTEM CS
AUTOMATIC TRANSMISSION 4AT
AUTOMATIC TRANSMISSION
(DIAGNOSTIC)4AT(H4SO)
AUTOMATIC TRANSMISSION
(DIAGNOSTIC)4AT(H4DOTC)
AUTOMATIC TRANSMISSION
(DIAGNOSTIC)4AT(H4DOTC 2.5)
MANUAL TRANSMISSION AND
DIFFERENTIAL5MT
CLUTCH SYSTEM CL
Page 2710 of 2870
AUTOMATIC TRANSMISSION
(DIAGNOSTIC)
4AT(H4DOTC 2.5)
Page
1. General Description ....................................................................................2
Page 2711 of 2870
4AT(H4DOTC 2.5)-2
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
General Description
1. General Description
A: SPECIFICATION
Trouble shooting for 2.5 L turbo model is included
in “4AT(H4DOTC)” section.
dure.>
Page 2712 of 2870

FUJI HEAVY INDUSTRIES LTD. G8080GE5
2004 FORESTER SERVICE MANUAL QUICK REFERENCE INDEX
TRANSMISSION SECTION
This service manual has been prepared
to provide SUBARU service personnel
with the necessary information and data
for the correct maintenance and repair
of SUBARU vehicles.
This manual includes the procedures
for maintenance, disassembling, reas-
sembling, inspection and adjustment of
components and diagnostics for guid-
ance of experienced mechanics.
Please peruse and utilize this manual
fully to ensure complete repair work for
satisfying our customers by keeping
their vehicle in optimum condition.
When replacement of parts during
repair work is needed, be sure to use
SUBARU genuine parts.
All information, illustration and specifi-
cations contained in this manual are
based on the latest product information
available at the time of publication
approval.CONTROL SYSTEM CS
AUTOMATIC TRANSMISSION 4AT
AUTOMATIC TRANSMISSION
(DIAGNOSTIC)4AT(H4SO)
AUTOMATIC TRANSMISSION
(DIAGNOSTIC)4AT(H4DOTC)
AUTOMATIC TRANSMISSION
(DIAGNOSTIC)4AT(H4DOTC 2.5)
MANUAL TRANSMISSION AND
DIFFERENTIAL5MT
CLUTCH SYSTEM CL