2004 SUBARU FORESTER engine

4AT(H4DOTC)-23
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Power Indicator Light Display
 RHD model
Step Check Yes No
1 CHECK POWER INDICATOR LIGHT.
Turn the ignition switch to ON (engine OFF).Does the POWER indicator
light illuminate?Go to step 3.Go to step 2.
2 CHECK POWER INDICATOR LIGHT.
1) Turn the ignition switch to OFF.
2) Remove the combination meter.
3) Remove the POWER indicator light bulb
from combination meter.Is the POWER indicator light
bulb OK?Go to step 4.Replace the
POWER indicator
light bulb.
3 CHECK FUSE (No. 14).
Remove the fuse (No. 14).Is the fuse (No. 14) blown out? Replace the fuse
(No. 14). If replaced
fuse (No. 14) is
blown out easily,
repair short circuit
in harness between
fuse (No. 14) and
combination meter.Go to step 4.
AT-01839
TCM
SBF-4 No.14 SBF-1
E
E
A10
A4
A16
B4
B22
B5 B14
C25
P RND3 2 1
9
8
10
3
11
4
6
53
2
1
8
7
6
5
4
T7T7
B12
B55 T3B12
12 34
56 78
9
10
11
12
12 3456
789101112
i10
i11
B9
1116
C2
i2B37
i3B38
POWER
B:
B54 A:B56 C: B:
123456
78 9 10 1112
13
14
15
1617
1819
2021
2223
24
2526
2728
29
30
i10 B: C:
i11
C:
1234
5678910
B56
12 78 956 34
10 11 12 19 20 21
29 30 31 13 14 15 16 17
27 2818
22 23 24 25 26
C:
B55
12 7
8956 34
10 11 12
19 20 2113 14 15 16
17 18 22 23 24
B:
i3
219
32 1234 56
10 11 12 13 14 157
16
23 3019 20
22 26 27 28 298
17
24 3118
25
IGNITION
SWITCH
INHIBITOR SWITCH
BATTERY
CONBINATION
METERB54 A:
123
8910411 12
13 14 15 1656
7
17
i2
123 8
910411 12 13 14 15 165671718

4AT(H4DOTC)-24
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Power Indicator Light Display
4 CHECK HARNESS CONNECTOR BETWEEN
COMBINATION METER AND IGNITION
SWITCH.
1) Turn the ignition switch to ON (engine OFF).
2) Measure the voltage between combination
meter connector and chassis ground.
Connector & terminal
(i10) No. 9 (+) — Chassis ground (
−):Is the voltage more than 9 V? Go to step 5.Repair the open
circuit in harness
between combina-
tion meter and bat-
tery.
5 CHECK COMBINATION METER.
Measure the voltage between combination
meter connector and chassis ground.
Connector & terminal
(i11) No. 2 (+) — Chassis ground (
−):Is the voltage less than 9 V? Repair the combi-
nation meter.
Combination
Meter Assembly.>Go to step 6.
6 CHECK OPEN CIRCUIT OF HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from combination
meter connector.
3) Measure the resistance of harness
between combination meter.
Connector & terminal
(B56) No. 25 — (i11) No. 2:Is the resistance less than 1
Ω?Go to step 7.Repair the open
circuit in harness
between TCM and
combination
meter, and poor
contact in cou-
pling connector.
7 CHECK INPUT SIGNAL FOR TCM.
1) Connect the connector to TCM and combi-
nation meter.
2) Turn the ignition switch to ON (engine OFF).
3) Measure the voltage between TCM con-
nector and chassis ground.
Connector & terminal
(B56) No. 25 (+) — Chassis ground (
−):Is the voltage less than 1 V? Go to step 8.Replace the TCM.
Transmission Con-
trol Module
(TCM).>
8 INSPECT POWER INDICATOR LIGHT.Does the POWER indicator
light illuminate?Diagnose accord-
ing to basic diag-
nostic procedure.Inspect power sup-
ply and ground cir-
cuit. Step Check Yes No

4AT(H4DOTC)-26
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Power Indicator Light Display
2 CHECK POWER SUPPLY OF TCM.
1) Disconnect the connector from TCM.
2) Turn the ignition switch to ON.
3) Measure the voltage between TCM con-
nector and chassis ground.
Connector & terminal
(B56) No. 27 (+) — Chassis ground (
−):
(B56) No. 28 (+) — Chassis ground (
−):
(B56) No. 29 (+) — Chassis ground (
−):Is the voltage 10 — 13 V? Go to step 4.Go to step 3.
3 CHECK FUSE (No. 4).
1) Turn the ignition switch to OFF.
2) Remove the fuse (No. 4).Is the fuse (No. 4) blown out? Replace the fuse
(No. 4). If replaced
fuse (No. 4) has
blown out easily,
repair short circuit
in harness between
fuse (No. 4) and
TCM.Repair the open
circuit in harness
between fuse (No.
4) and TCM, or
fuse (No. 4) and
battery, and poor
contact in cou-
pling connector.
4 CHECK IGNITION POWER SUPPLY CIR-
CUIT.
1) Turn the ignition switch to ON (engine OFF).
2) Measure the ignition power supply voltage
between TCM connector and chassis ground.
Connector & terminal
(B56) No. 21 (+) — Chassis ground (–):
(B56) No. 31 (+) — Chassis ground (–):Is the voltage 10 — 13 V? Go to step 6.Go to step 5.
5 CHECK FUSE (No. 11).
Remove the fuse (No. 11).Is the fuse (No. 11) blown out? Replace the fuse
(No. 11). If
replaced fuse (No.
11) has blown out
easily, repair short
circuit in harness
between fuse (No.
11) and TCM.Repair the open
circuit in harness
between fuse (No.
11) and TCM, or
fuse (No. 11) and
battery, and poor
contact in cou-
pling connector.
6 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from TCM and
transmission.
3) Measure the resistance of harness
between TCM and transmission connector.
Connector & terminal
(B55) No. 8 — (B11) No. 19:
(B55) No. 17 — (B11) No. 19:
(B56) No. 2 — (B11) No. 20:
(B56) No. 3 — (B11) No. 20:Is the resistance less than 1
Ω?Go to step 7.Repair the open
circuit in harness
between TCM,
transmission har-
ness connector,
and poor contact
in coupling con-
nector.
7 CHECK HARNESS CONNECTOR BETWEEN
TRANSMISSION AND TRANSMISSION
GROUND.
Measure the resistance of harness between
transmission and transmission ground.
Connector & terminal
(T4) No. 19 — Transmission ground:
(T4) No. 20 — Transmission ground:Is the resistance less than 1
Ω?Go to step 8.Repair the open
circuit in harness
between transmis-
sion and transmis-
sion ground.
8 CHECK POOR CONTACT IN CONNECTORS.Is there poor contact in TCM
power supply, ground line and
data link connector?Repair the con-
nector.Replace the TCM.
Transmission Con-
trol Module
(TCM).> Step Check Yes No

4AT(H4DOTC)-28
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure for Subaru Select Monitor Communication
Step Check Yes No
1 CHECK INSTALLATION OF TCM CONNEC-
TOR.
Turn the ignition switch to OFF.Is the TCM connector inserted
into TCM?Go to step 2.Insert the TCM
connector into
TCM.
2 CHECK SUBARU SELECT MONITOR POW-
ER SUPPLY CIRCUIT.
Measure the voltage between data link con-
nector and chassis ground.
Connector & terminal
(B40) No. 1 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 3.Repair the har-
ness and connec-
tor between battery
and data link con-
nector, and poor
contact in coupling
connector.
3 CHECK SUBARU SELECT MONITOR
GROUND CIRCUIT.
Measure the resistance of harness between
data link connector and chassis ground.
Connector & terminal
(B40) No. 12 — Chassis ground:
(B40) No. 13 — Chassis ground:Is the resistance less than 1
Ω?Go to step 4.Repair the open
circuit in harness
between data link
connector and
ground terminal,
and poor contact
in coupling con-
nector.
4 CHECK COMMUNICATION OF SUBARU SE-
LECT MONITOR.
1) Turn the ignition switch to ON.
2) Using the Subaru Select Monitor, check
whether communication to transmission sys-
tems can be executed normally.Are the contents of transmis-
sion system displayed on Sub-
aru Select Monitor?Go to step 9.Go to step 5.
5 CHECK COMMUNICATION OF SUBARU SE-
LECT MONITOR.
1) Turn the ignition switch to OFF.
2) Disconnect the TCM connector.
3) Check whether communication to engine
systems can be executed normally.Are the contents of engine sys-
tem displayed on Subaru
Select Monitor?Go to step 7.Go to step 6.
6 CHECK COMMUNICATION OF SUBARU SE-
LECT MONITOR.
1) Turn the ignition switch to OFF.
2) Connect the TCM connector.
3) Disconnect the ECM connector.
4) Check whether communication to transmis-
sion systems can be executed normally.Are the contents of transmis-
sion system displayed on Sub-
aru Select Monitor?Inspect the ECM. Go to step 7.
7 CHECK HARNESS CONNECTOR BETWEEN
EACH CONTROL MODULE AND DATA LINK
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the TCM and ECM connectors.
3) Measure the resistance between TCM con-
nector and chassis ground.
Connector & terminal
(B40) No. 10 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 8.Repair the har-
ness and connec-
tor between each
control module and
data link connector.
8 CHECK OUTPUT SIGNAL FOR TCM.
1) Turn the ignition switch to ON.
2) Measure the voltage between TCM and
chassis ground.
Connector & terminal
(B40) No. 10 (+) — Chassis ground (
−):Is the voltage more than 1 V? Repair the harness
and connector
between each con-
trol module and
data link connector.Go to step 9.
9 CHECK HARNESS/CONNECTOR BETWEEN
TCM AND DATA LINK CONNECTOR.
Measure the resistance between TCM connec-
tor and data link connector.
Connector & terminal
(B56) No. 12 — (B40) No. 10:Is the resistance less than 0.5
Ω?Go to step 10.Repair the harness
and connector
between TCM and
data link connector.

4AT(H4DOTC)-30
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
12.List of Diagnostic Trouble Code (DTC)
A: LIST
DTC Item Diagnosis content Reference
P0705Transmission Range Sen-
sor Circuit (PRNDL Input)Inhibitor switch malfunction, open or
short circuit TRANSMISSION RANGE SENSOR,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0712Transmission Fluid Temper-
ature Sensor Circuit Low
InputATF temperature sensor malfunction,
open input signal circuit TRANSMISSION FLUID TEMPERA-
TURE SENSOR CIRCUIT LOW INPUT,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0713Transmission Fluid Temper-
ature Sensor Circuit High
InputATF temperature sensor malfunction,
short input signal circuit TRANSMISSION FLUID TEMPERA-
TURE SENSOR CIRCUIT HIGH INPUT,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0715Input/Turbine Speed Sensor
CircuitTorque converter turbine speed sen-
sor malfunction, open or short input
signal circuit INPUT/TURBINE SPEED SENSOR
CIRCUIT, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0719Torque Converter/Brake
Switch “B” Circuit Low Brake switch malfunction, open input
signal circuit TORQUE CONVERTER/BRAKE
SWITCH “B” CIRCUIT LOW, Diagnostic
Procedure with Diagnostic Trouble Code
(DTC).>
P0720Output Speed Sensor Cir-
cuitFront vehicle speed sensor malfunc-
tion, open or short input signal circuit OUTPUT SPEED SENSOR CIRCUIT,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0724Torque Converter/Brake
Switch “B” Circuit HighBrake switch malfunction, short input
signal circuit TORQUE CONVERTER/BRAKE
SWITCH “B” CIRCUIT HIGH, Diagnostic
Procedure with Diagnostic Trouble Code
(DTC).>
P0725 Engine Speed Input CircuitOpen or short engine speed output
signal circuit ENGINE SPEED INPUT CIRCUIT, Diag-
nostic Procedure with Diagnostic Trouble
Code (DTC).>
P0731 Gear 1 Incorrect Ratio Vehicle speed sensor, torque con-
verter turbine speed sensor, or con-
trol valve malfunction GEAR 1 INCORRECT RATIO, Diagnos-
tic Procedure with Diagnostic Trouble
Code (DTC).>
P0732 Gear 2 Incorrect Ratio Vehicle speed sensor, torque con-
verter turbine speed sensor, or con-
trol valve malfunction GEAR 2 INCORRECT RATIO, Diagnos-
tic Procedure with Diagnostic Trouble
Code (DTC).>
P0733 Gear 3 Incorrect Ratio Vehicle speed sensor, torque con-
verter turbine speed sensor, or con-
trol valve malfunction GEAR 3 INCORRECT RATIO, Diagnos-
tic Procedure with Diagnostic Trouble
Code (DTC).>
P0734 Gear 4 Incorrect Ratio Vehicle speed sensor, torque con-
verter turbine speed sensor, or con-
trol valve malfunction GEAR 4 INCORRECT RATIO, Diagnos-
tic Procedure with Diagnostic Trouble
Code (DTC).>

4AT(H4DOTC)-33
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
13.Diagnostic Procedure with Diagnostic Trouble Code (DTC)
A: DTC P0705 TRANSMISSION RANGE SENSOR
DTC DETECTING CONDITION:
 Inhibitor switch with fault.
 Input signal circuit of inhibitor switch is open.
 More than 2 range signal is input.
 “D” range signal is not input when the select lever is shifted from “N” to “3” range.
TROUBLE SYMPTOM:
 Shift characteristics are erroneous.
 Engine brake is not effected when select lever is in “3” range.
 Engine brake is not effected when select lever is in “2” range.
 Engine brake is not effected when select lever is in “1” range.
 Range position of select lever and AT select lever position indicator light on combination meter is not
matched.
WIRING DIAGRAM:
 LHD model
AT-01841
B5B14B22B4A16A4A10A6
32187654
9810311465
E
B38
i3
i10i10
T3
T7 B12
A:
B:B54
TCM
B55
12
14
P
R
N
D
3
2
1
B12
123456789101112
123456789101112131415161718192021222324252627282930
B55
12 7
8956 34
10 11 12
19 20 2113 14 15 16
17 18 22 23 24
B:
INHIBITOR SWITCHCONBINATION
METER
B54
A:
12
7
89 56 34
10 11 1219 20 21
29 30 31 13 14 151617
27 2818
22 23 24 25 26
T7
123456
78910 11 12
B38
1234 56
10 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
25921
32

4AT(H4DOTC)-43
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ATF TEMPERATURE SENSOR.
Measure the resistance of harness between
TCM and transmission connector.
Connector & terminal
(B55) No. 9 — (B11) No. 15:Is the resistance less than 1
Ω?Go to step 3.Repair the open
circuit in harness
between TCM and
transmission con-
nector.
3 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ATF TEMPERATURE SENSOR.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B55) No. 21 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 4.Repair the short
circuit in harness
between TCM and
transmission con-
nector.
4 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ATF TEMPERATURE SENSOR.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B55) No. 9 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 5.Repair the short
circuit in harness
between TCM and
transmission con-
nector.
5 CHECK ATF TEMPERATURE SENSOR.
1) Turn the ignition switch to OFF.
2) Connect the connectors to transmission
and TCM.
3) Turn the ignition switch to ON and start
engine.
4) Warm-up the transmission until ATF tem-
perature reaches to 80°C (176°F).
N
OTE:
If ambient temperature is below 0°C (32°F),
drive the vehicle until ATF reaches its operating
temperature.
5) Disconnect the connector from transmis-
sion.
6) Measure the resistance between transmis-
sion connector terminals.
Connector & terminal
(T4) No. 11 — No. 15:Is the resistance 500 — 600
Ω?Go to step 6.Go to step 11.
6 CHECK ATF TEMPERATURE SENSOR.
Measure the resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 11 — No. 15:Does the resistance value
increase when ATF tempera-
ture decreases?Go to step 7.Go to step 11.
7 PREPARE SUBARU SELECT MONITOR.Do you have a Subaru Select
Monitor?Go to step 9.Go to step 8.
8 CHECK INPUT SIGNAL FOR TCM.
1) Connect the connector to transmission.
2) Warm-up the transmission until ATF tem-
perature is about 80°C (176°F).
N
OTE:
If ambient temperature is below 0°C (32°F),
drive the vehicle until ATF reaches its operating
temperature.
3) Measure the voltage between TCM con-
nector terminal.
Connector & terminal
(B55) No. 9 (+) — No. 21 (
−):Is the voltage 1.5 — 1.9 V? Even if the POWER
indicator light was
blinking the circuit
has returned to a
normal condition at
this time. Tempo-
rary poor contact of
the connector or
harness may be the
cause. Repair the
harness or contact
in ATF temperature
sensor and trans-
mission connector.Go to step 10. Step Check Yes No

4AT(H4DOTC)-44
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
9 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Connect the connector to transmission.
2) Turn the ignition switch to ON (engine
OFF).
3) Read the data of ATF temperature using the
Subaru Select Monitor. 15, OPERATION, Subaru Select Monitor.>Does the ATF temperature
gradually decrease?Even if the POWER
indicator light was
blinking, the circuit
has returned to a
normal condition at
this time. Tempo-
rary poor contact of
the connector or
harness may be the
cause. Repair the
harness or contact
in ATF temperature
sensor and trans-
mission connector.Go to step 10.
10 CHECK POOR CONTACT.Is there poor contact in ATF
temperature sensor circuit?Repair the poor
contact.Replace the TCM.
Transmission Con-
trol Module
(TCM).>
11 CHECK HARNESS CONNECTOR BETWEEN
TRANSMISSION AND ATF TEMPERATURE
SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from transmis-
sion.
3) Remove the transmission connector from
bracket.
4) Lift-up the vehicle and place rigid racks.
NOTE:
Raise all wheels off floor.
5) Drain the ATF.
CAUTION:
Do not drain the ATF until it cools down.
6) Remove the oil pan, and disconnect the
connector from ATF temperature sensor con-
nector.
7) Measure the resistance of harness
between ATF temperature sensor and trans-
mission connector.
Connector & terminal
(T4) No. 11 — (AT11) No. 1:Is the resistance less than 1
Ω?Go to step 12.Repair the open
circuit in harness
between ATF tem-
perature sensor
and transmission
connector.
12 CHECK HARNESS CONNECTOR BETWEEN
TRANSMISSION AND ATF TEMPERATURE
SENSOR.
Measure the resistance of harness between
ATF temperature sensor and transmission con-
nector.
Connector & terminal
(T4) No. 15 — (AT11) No. 3:Is the resistance less than 1
Ω?Go to step 13.Repair the open
circuit in harness
between ATF tem-
perature sensor
and transmission
connector.
13 CHECK HARNESS CONNECTOR BETWEEN
TRANSMISSION AND ATF TEMPERATURE
SENSOR.
Measure the resistance of harness between
transmission connector and transmission
ground.
Connector & terminal
(T4) No. 11 — Transmission ground:Is the resistance more than 1
MΩ?Go to step 14.Repair the short
circuit in harness
between ATF tem-
perature sensor
and transmission
connector. Step Check Yes No