2004 SUBARU FORESTER transmission

4AT(H4DOTC)-6
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
General Description
5. OPERATION OF SELECT LEVER
Make sure there is no abnormal noise, dragging or
contact pattern in each select lever range.
WARNING:
Stop the engine while checking operation of se-
lect lever.
6. POWER SWITCH
Make sure that the POWER indicator light in com-
bination meter comes on, when turning the POW-
ER switch to ON.
7. HOLD SWITCH
Make sure that the HOLD indicator light in combina-
tion meter comes on, when turning the HOLD switch
to ON.
AT-00413
P
R
N
D
3
2
1
AT-00319
AT-00320

4AT(H4DOTC)-7
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
General Description
C: PREPARATION TOOL
1. SPECIAL TOOL
2. GENERAL TOOL
ILLUSTRATION TOOL NUMBER DESCRIPTION REMARKS
24082AA230
(Newly adopted tool)CARTRIDGE Troubleshooting for electrical system.
22771AA030 SUBARU SELECT
MONITOR KITTroubleshooting for electrical system.
 English: 22771AA030 (Without printer)
 German: 22771AA070 (Without printer)
 French: 22771AA080 (Without printer)
 Spanish: 22771AA090 (Without printer)
TOOL NAME REMARKS
Circuit tester Used for measuring resistance, voltage and current.
Oscilloscope Used for measuring sensor.
ST24082AA230
ST22771AA030

4AT(H4DOTC)-8
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Electrical Components Location
4. Electrical Components Location
A: LOCATION
1. CONTROL MODULE
 LHD MODEL
 RHD MODEL
(1) Engine control module (ECM) (3) Transmission control module
(TCM)(4) Data link connector
(2) AT diagnostic warning light
(POWER indicator light)
AT-00414
(1) (2)
(3) (4)
AT-00369 (2)
(4)
(1)
(3)

4AT(H4DOTC)-9
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Electrical Components Location
LHD RHD
AT-00323
(1)
AT-00324
(2)
(3)
AT-00416
(3)
AT-00372
(4)
AT-00417

4AT(H4DOTC)-10
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Electrical Components Location
2. SENSOR
(1) Throttle position sensor (2.0 L
model)(4) Rear vehicle speed sensor (7) Accelerator pedal position sensor
(2.5 L model)
(5) Torque converter turbine speed
sensor (2) Front vehicle speed sensor
(3) Inhibitor switch (6) ATF temperature sensor
AT-01836
(3) (6)
(5) (1) (2) (4)(7)
(1)
AT-01105
AT-01474
(2)(4)
(3)AT-00330
(5)
AT-00331

4AT(H4DOTC)-11
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Electrical Components Location
3. SOLENOID
(1) Line pressure linear solenoid (4) Low clutch duty solenoid (7) Lock-up duty solenoid
(2) High clutch duty solenoid (5) Transfer duty solenoid
(3) 2-4 brake duty solenoid (6) Low & reverse duty solenoid
(6)
AT-00378
(7)
AT-01837
AT-00379
(1)(2)(3)(4)
(5)(6)
(7)
(2) (3) (4)
(7) (6) (5)
(1)
AT-00380

4AT(H4DOTC)-12
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Transmission Control Module (TCM) I/O Signal
5. Transmission Control Module (TCM) I/O Signal
A: ELECTRICAL SPECIFICATION
Check with ignition switch ON.
ItemConnector
No.Terminal No. Measuring conditions Voltage (V)Resistance
to chassis
ground (Ω)
Back-up power supply B5627
Ignition switch OFF 10 — 13 — 28
29
ACC power supply B56 16 Ignition switch ACC 10 — 13 —
Ignition power supplyB56 21
Ignition switch ON
(with engine OFF)10 — 13 —
B56 31
Inhibitor
switch“P” range
switchB55 5Select lever in “P” range Less than 1
—
Select lever in any other than
“P” range (except “N” range)More than 8
“N” range
switchB55 22Select lever in “N” range Less than 1
—
Select lever in any other
than “N” rangeMore than 8
“R” range
switchB55 14Select lever in “R” range Less than 1
—
Select lever in any other
than “R” rangeMore than 8
“D” range
switchB55 4Select lever in “D” range Less than 1
—
Select lever in any other
than “D” rangeMore than 8
“3” range
switchB54 16Select lever in “3” range Less than 1
—
Select lever in any other
than “3” rangeMore than 8
“2” range
switchB54 4Select lever in “2” range Less than 1
—
Select lever in any other
than “2” rangeMore than 8
“1” range
switchB54 10Select lever in “1” range Less than 1
—
Select lever in any other
than “1” rangeMore than 8
Brake switch B55 20Brake pedal depressed. More than 10.5
—
Brake pedal released. Less than 1
AT-01107
B54B55B56
1 2 7
8 9 5 6
3 4
10 11 12
19 20 21 13 14 15 16
17 18 22 23
241 2 7 8 95634
10 11 12 19 20 21
29 30 3113 14 15 16 17
27
28 18
22 23 24 25 26 1 2 3
8 9 104
11 12
13 14 15
165 6
7
17To
ToTo

4AT(H4DOTC)-13
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Transmission Control Module (TCM) I/O Signal
Accelerator pedal position
sensor (2.5 L model)
B55 19Throttle fully closed. More than 0.2
—
Throttle position sensor (2.0
L model)Throttle fully open. Less than 4.6
Accelerator pedal position
sensor power supply (2.5 L
model)B55 10 Ignition switch ON
(with engine OFF)Approx. 5 —
Throttle position sensor
power supply (2.0 L model)
ATF temperature sensor B55 21ATF temperature 20°C
(68°F)3.5 — 4.3 3.9 k — 4.7 k
ATF temperature 80°C
(176°F)1.5 — 1.9 500 — 600
Rear vehicle speed sensor B55 24Vehicle speed at least
20 km/h (12 MPH)More than 2 (AC range) —
Front vehicle speed sensor B55 6Vehicle stopped. 0
450 — 750
Vehicle speed at least
20 km/h (12 MPH)More than 1 (AC range)
Torque converter turbine
speed sensorB55 7Engine idling after warm-
up. (“D” range)0
450 — 750
Engine idling after warm-
up. (“N” range)More than 1 (AC range)
Vehicle speed output signal B56 1Vehicle speed at least
10 km/h (6 MPH)Less than 1←
→More than 4—
Engine speed signal B55 13Ignition switch ON
(with engine OFF)Less than 1
—
Ignition switch ON
(with engine ON)More than 5
(AC range)
Line pressure linear solenoid B56 20Ignition switch ON
(with engine OFF)
“R” range and throttle fully
closed after warm-up.5 — 7
4.0 — 8.0
Ignition switch ON
(with engine OFF)
“R” range and throttle fully
open after warm-up.3 — 5
Lock-up duty solenoid B56 5When lock up occurs. More than 10.5
2.0 — 4.5
When lock up is released. Less than 1
Transfer duty solenoid B56 4“P” or “N” range Less than 1
2.0 — 4.5
Throttle fully open and with
select lever in 1st gear.More than 10.5
2-4 brake duty solenoid B56 6“P” or “N” range More than 10.5
2.0 — 4.5
2nd or 4th gear Less than 1
High clutch duty solenoid B56 83rd or 4th gear Less than 1
2.0 — 4.5
“P” or “N” range More than 10.5
Low clutch duty solenoid B56 91st or 2nd gear Less than 1
2.0 — 4.5
“P” or “N” range More than 10.5
Low & reverse duty solenoid B56 7“P” or “N” range More than 10.5
2.0 — 4.5
“1” range More than 5
HOLD switch B54 2HOLD switch ON Less than 1
—
HOLD switch OFF More than 10.5 Check with ignition switch ON.
ItemConnector
No.Terminal No. Measuring conditions Voltage (V)Resistance
to chassis
ground (Ω)