2004 SUBARU FORESTER automatic transmission

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)

4AT(H4DOTC)-14
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Transmission Control Module (TCM) I/O Signal
POWER switch B54 8POWER switch ON Less than 1
—
POWER switch OFF More than 8
POWER indicator light B56 25Light ON Less than 1
—
Light OFF More than 9
ABS signal B54 12ABS switch ON Less than 1
—
ABS switch OFF 6.5 — 15
Front vehicle speed sensor
groundB55 15 — 0 Less than 1
Rear vehicle speed sensor
groundB55 23 — 0 Less than 1
Combination meter B54 6 Ignition switch ON Pulse signal —
System ground lineB55 17
— 0 Less than 1 B56 2
B56 3
B55 8
Sensor ground line 3 B55 9 — 0 Less than 1
Sensor ground line 4 B56 19 — 0 Less than 1
Range lock signal B56 18“D” range 0 km/h (0 MPH) More than 10.5
20 — 40
“D” range 20 km/h
(12 MPH)Less than 1
Data link signal (Subaru
Select Monitor)B56 12 — — —
CAN communication signal
(+)B55 3 Ignition switch ON Pulse signal —
CAN communication signal
(−)B55 12 Ignition switch ON Pulse signal —Check with ignition switch ON.
ItemConnector
No.Terminal No. Measuring conditions Voltage (V)Resistance
to chassis
ground (Ω)

4AT(H4DOTC)-15
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Subaru Select Monitor
6. Subaru Select Monitor
A: OPERATION
1. READ DIAGNOSTIC TROUBLE CODE
1) Prepare the Subaru Select Monitor kit.
2) Connect the diagnosis cable to Subaru Select
Monitor.
3) Insert the cartridge into Subaru Select Monitor.
General Description.>
4) Connect the Subaru Select Monitor to data link
connector.
(1) Data link connector located in the lower por-
tion of instrument panel (on driver’s side).
(2) Connect the diagnosis cable to data link con-
nector.
NOTE:
Do not connect scan tools except for Subaru Select
Monitor.5) Turn the ignition switch to ON (engine OFF) and
Subaru Select Monitor switch to ON.
6) On the «Main Menu» display screen, select the
{Each System Check} and press the [YES] key.
7) On the «System Selection Menu» display screen,
select the {Transmission Control System} and press
the [YES] key.
8) Press the [YES] key after the information of trans-
mission type is displayed.
9) On the «Transmission Diagnosis» display screen,
select the {Diagnostic Code(s) Display} and press
the [YES] key.
NOTE:
 For details concerning operation procedure, re-
fer to the “SUBARU SELECT MONITOR OPERA-
TION MANUAL”.
 For details concerning the DTC, refer to the DTC
LIST. Trouble Code (DTC).>
2. READ CURRENT DATA
1) On the «Main Menu» display screen, select the
{Each System Check} and press the [YES] key.
2) On the «System Selection Menu» display screen,
select the {Transmission Control System} and press
the [YES] key.
3) Press the [YES] key after the information of trans-
mission type is displayed.
4) On the «Transmission Diagnosis» display screen,
select the {Current Data Display & Save} and press
the [YES] key.
5) On the «Transmission Diagnosis» display screen,
select the {Data Display} and press the [YES] key.
AT-00338
AT-00339
AT-00422
(A) POWER switch
(A)
AT-00341

4AT(H4DOTC)-16
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Subaru Select Monitor
6) Using the scroll key, move the display screen up or down until desired data is shown.
A list of the support data is shown in the following table.
NOTE:
For detailed operation procedure, refer to the “SUBARU SELECT MONITOR OPERATION MANUAL”.
Contents Display Unit of measure
Battery voltage Battery Voltage V
Rear vehicle speed sensor signal Rear Wheel Speed km/h or MPH
Front vehicle speed sensor signal Front Wheel Speed km/h or MPH
Engine speed signal Engine Speed rpm
ATF temperature signal ATF Temp.°C or °F
Throttle position signal Throttle Sensor Voltage V
Gear position Gear Position —
Line pressure control duty ratio Line Pressure Duty Ratio %
Lock up clutch control duty ratio Lock Up Duty Ratio %
Transfer clutch control duty ratio Transfer Duty Ratio %
Power supply for throttle position sensor Throttle Sensor Power V
Torque converter turbine speed signal Turbine Revolution Speed rpm
2-4 brake timing pressure control duty ratio Brake Clutch Duty Ratio %
Low clutch duty ratio L/C Duty %
High clutch duty ratio H/C Duty %
Low & reverse brake duty ratio L&R/B Duty %
Throttle position Throttle position %
Accelerator pedal position Accel. Opening Angle %
Cruise control system Cruise Control Signal ON or OFF
Automatic transmission fluid temperature lamp ATF Temperature Lamp ON or OFF
Stop light switch signal Stop Light Switch ON or OFF
ABS signal ABS Signal ON or OFF
Parking range signal P Range Signal ON or OFF
Neutral range signal N Range Signal ON or OFF
Reverse range signal R Range Signal ON or OFF
Drive range signal D Range Signal ON or OFF
3rd range signal 3rd Range Signal ON or OFF
2nd range signal 2nd Range Signal ON or OFF
1st range signal 1st Range Signal ON or OFF
AT diagnosis indicator lamp Diagnosis Lamp ON or OFF
POWER switch signal POWER Switch ON or OFF
HOLD switch signal HOLD Switch ON or OFF
FWD switch signal FWD SW ON or OFF
Shift lock solenoid signal Shift Lock solenoid ON or OFF

4AT(H4DOTC)-17
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Subaru Select Monitor
3. CLEAR MEMORY MODE
1) On the «Main Menu» display screen, select the
{2. Each System Check} and press the [YES] key.
2) On the «System Selection Menu» display screen,
select the {Transmission Control System} and press
the [YES] key.
3) Press the [YES] key after the information of
transmission type is displayed.
4) On the «Transmission Diagnosis» display screen,
select the {Clear Memory} and press the [YES] key.
5) When the “Done” is shown on display screen,
turn the Subaru Select Monitor and ignition switch
to OFF.
NOTE:
 For details concerning operation procedure, refer
to the SUBARU SELECT MONITOR OPERATION
MANUAL.
 When {Clear Memory 2} is selected and executed,
DTC and learned control memory is cleared. If Clear
Memory 2 is performed, execute the learning con-
trol. OF LEARNING CONTROL, OPERATION, Subaru
Select Monitor.>
4. FACILITATION OF LEARNING CON-
TROL
1) Shift the select lever to “P” range, and apply
parking brake.
2) Lift-up the vehicle.
3) Connect the Subaru Select Monitor to data link
connector, and then turn the ignition switch to ON.
4) Perform the {Clear Memory 2} using Subaru Select
Monitor. ORY MODE, OPERATION, Subaru Select Monitor.>
5) Using Subaru Select Monitor, check that the DTC
is not output. AGNOSTIC TROUBLE CODE, OPERATION, Sub-
aru Select Monitor.>
6) Warm-up the engine until the ATF temperature
which is displayed on the Subaru Select Monitor is
within 60 — 90°C (140 — 194°F). 4AT(H4DOTC)-15, READ CURRENT DATA, OP-
ERATION, Subaru Select Monitor.>
7) Shift the select lever to “R” range.
8) Turn all switches including headlight, air condi-
tioner, seat heater, rear defogger and etc. to OFF.
9) Turn the ignition switch to OFF.
10) Depress the brake pedal fully until the facilitation
of learning control is completed when the “Communi-
cation Failed!” is displayed on Subaru Select Monitor.
11) Turn the ignition switch to ON.
12) Check that the Subaru Select Monitor is re-
turned to normal operation.
13) Shift the select lever to “P” range, and then wait
for more than 3 seconds.14) Shift the select lever to “R” range, and then wait
for more than 3 seconds.
15) Shift the select lever to “N” range, and then wait
for more than 3 seconds.
16) Shift the select lever to “D” range, and then wait
for more than 3 seconds.
17) Shift the select lever to “N” range, and then wait
for more than 3 seconds.
18) Slightly depress the accelerator pedal fully.
19) Slightly release the accelerator pedal fully.
20) Start the engine, and idle it.
21) Shift the select lever to “D” range.
22) Start the facilitation of learning control. At this
time, the POWER indicator light in combination meter
blinks at 2 Hz. When the POWER indicator light does
not blink, turn the ignition switch to OFF and repeat
the procedures from step 4). When the POWER indi-
cator light which blinking at 2 Hz changes to blink at
0.5 Hz, facilitation of learning control is completed.
NOTE:
When blinking of POWER indicator light changes
from 2 Hz to 4 Hz during facilitation of learning con-
trol, repeat the procedure from step 4).
23) Shift the select lever to “N” range, and then turn
the ignition switch to OFF.
24) Shift the select lever to the “P” range, and then
complete the facilitation of learning control.

4AT(H4DOTC)-18
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Read Diagnostic Trouble Code (DTC)
7. Read Diagnostic Trouble Code
(DTC)
A: OPERATION
Refer to Subaru Select Monitor for information about
how to obtain and understand DTC. 4AT(H4DOTC)-15, OPERATION, Subaru Select
Monitor.>
NOTE:
DTC can not be read through POWER indicator light.

4AT(H4DOTC)-19
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Inspection Mode
8. Inspection Mode
A: OPERATION
WARNING:
Observe the road traffic law during actual driving.
Move the select lever to “D” range, and then drive
the vehicle at 60 km/h (37 MPH) for at least 10 sec-
onds.

4AT(H4DOTC)-20
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Clear Memory Mode
9. Clear Memory Mode
A: OPERATION
1. WITHOUT SUBARU SELECT MONITOR
Current DTC shown on display are cleared by turn-
ing the ignition switch to OFF after conducting on-
board diagnostics operation. Previous DTC, how-
ever, cannot be cleared since they are stored in the
TCM memory which is operating on back-up power
supply. These DTC can be cleared by removing the
TCM connector for at least two minutes.
CLEAR MEMORY:
Disconnect the TCM connector (B55). (for at
least two minutes)
 The TCM connector (B55) is located in the line to
memory back-up power supply of TCM. Removal of
this connector clears the previous DTC stored in
TCM memory.
 Be sure to remove the TCM connector (B55) for
at least the specified length of time. Otherwise, the
DTC may not be cleared.
2. WITH SUBARU SELECT MONITOR
Refer to “Subaru Select Monitor” for information
about how to clear DTC.
MODE, OPERATION, Subaru Select Monitor.>