SUBARU FORESTER 2004 Service Repair Manual

4AT(H4DOTC)-25
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Power Indicator Light Display
2. CHECK POWER SUPPLY AND GROUND LINE
WIRING DIAGRAM:
Step Check Yes No
1 CHECK BATTERY TERMINAL.
Turn the ignition switch to OFF.Is there poor contact in battery
terminal?Repair or tighten the
battery terminal.Go to step 2.
AT-01840
B40B55B56
B21
F2B61F45
F60
B55 B:B56
B11
T4TCM C:
B40
E
NO.11
NO.4
SBF-4 SBF-1 C27
C28C29
B8
B17C31C21
C12 C2
C3
12 345678
9101112
13 14 1516
1
12 10
13
SBF-5
B21
E216
E
B100
F29
F60
F316
F44B61 7
E
EE
123
4
5678
9101112
13 14 15 16
B11
1
234
56
78
9
1314
15
20
19 1716 10 1112
18
12 7
8956 34
10 11 12
19 20 2113 14 15 16
17 18 22 23 2412 78956 34
10 11 12 19 20 21
29 30 31 13 14 15 16 17
27 2818
22 23 24 25 26
19
20
BATTERY
IGNITION
SWITCH
TRANSMISSION
B:
C:DATA LINK
CONNECTOR
F45
B629
LHD
RHD
RHD
LHD
LHDRHD
LHD
RHDRHD
LHD
1234 5678910 11 12 13 14 15 16 17 18 19 201234567891011121314151612345678

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)-27
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure for Subaru Select Monitor Communication
11.Diagnostic Procedure for Subaru Select Monitor Communication
A: COMMUNICATION FOR INITIALIZING IMPOSSIBLE
DIAGNOSTIC:
Faulty harness connector
TROUBLE SYMPTOM:
Subaru Select Monitor communication failure
WIRING DIAGRAM:
AT-01840
B40B55B56
B21
F2B61F45
F60
B55 B:B56
B11
T4TCM C:
B40
E
NO.11
NO.4
SBF-4 SBF-1 C27
C28C29
B8
B17C31C21
C12 C2
C3
12 345678
9101112
13 14 1516
1
12 10
13
SBF-5
B21
E216
E
B100
F29
F60
F316
F44B61 7
E
EE
123
4
5678
9101112
13 14 15 16
B11
1
234
56
78
9
1314
15
20
19 1716 10 1112
18
12 7
8956 34
10 11 12
19 20 2113 14 15 16
17 18 22 23 2412 78956 34
10 11 12 19 20 21
29 30 31 13 14 15 16 17
27 2818
22 23 24 25 26
19
20
BATTERY
IGNITION
SWITCH
TRANSMISSION
B:
C:DATA LINK
CONNECTOR
F45
B629
LHD
RHD
RHD
LHD
LHDRHD
LHD
RHDRHD
LHD
1234 5678910 11 12 13 14 15 16 17 18 19 201234567891011121314151612345678

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)-29
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure for Subaru Select Monitor Communication
10 CHECK INSTALLATION OF TRANSMISSION
HARNESS CONNECTOR.Is the transmission harness
connector inserted into bulk-
head harness connector?Go to step 11.Connect the bulk-
head harness con-
nector to
transmission har-
ness connector.
11 CHECK POOR CONTACT IN CONNECTORS.Is there poor contact in control
module power supply and data
link connector?Repair the poor
contact.Replace the TCM.
Transmission Con-
trol Module
(TCM).> Step Check Yes No

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)-31
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
P0736 Reverse Incorrect Ratio Vehicle speed sensor, torque con-
verter turbine speed sensor, or con-
trol valve malfunction REVERSE INCORRECT RATIO, Diag-
nostic Procedure with Diagnostic Trouble
Code (DTC).>
P0741Torque Converter Clutch
Circuit Performance or
Stuck OffLock up clutch malfunction or locking
of valve TORQUE CONVERTER CLUTCH CIR-
CUIT PERFORMANCE OR STUCK
OFF, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P0743Torque Converter Clutch
Circuit Electrical Lock up solenoid malfunction, open
or short output signal circuit TORQUE CONVERTER CLUTCH CIR-
CUIT ELECTRICAL, Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>
P0748Pressure Control Solenoid
“A” ElectricalLine pressure linear solenoid malfunc-
tion, open or short output signal circuit PRESSURE CONTROL SOLENOID “A”
ELECTRICAL, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P0753 Shift Solenoid “A” ElectricalLow clutch duty solenoid malfunction,
open or short output signal circuit SHIFT SOLENOID “A” ELECTRICAL,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0758 Shift Solenoid “B” Electrical2-4 brake duty solenoid malfunction,
open or short output signal circuit SHIFT SOLENOID “B” ELECTRICAL,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0763 Shift Solenoid “C” ElectricalHigh clutch duty solenoid malfunction,
open or short output signal circuit SHIFT SOLENOID “C” ELECTRICAL,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0768 Shift Solenoid “D” ElectricalLow & reverse clutch duty solenoid
malfunction, open or short output sig-
nal circuit SHIFT SOLENOID “D” ELECTRICAL,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0801Reverse Inhibitor Control
CircuitN–R lock solenoid malfunction, open
or short output signal circuit REVERSE INHIBITOR CONTROL CIR-
CUIT, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1706AT Vehicle Speed Sensor
Circuit Malfunction (rear
wheel)Rear vehicle speed sensor malfunc-
tion, open or short input signal circuit AT VEHICLE SPEED SENSOR CIR-
CUIT MALFUNCTION (REAR WHEEL),
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P1707AT AWD Solenoid Valve Cir-
cuit MalfunctionTransfer duty solenoid malfunction,
open or short output signal circuit AT AWD SOLENOID VALVE CIRCUIT
MALFUNCTION, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P1708Throttle Position Sensor
Circuit Low InputAccelerator pedal position sensor or
throttle position sensor malfunction,
open input signal circuit THROTTLE POSITION SENSOR CIR-
CUIT LOW INPUT, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P1709Throttle Position Sensor
Circuit High InputAccelerator pedal position sensor or
throttle position sensor malfunction,
short input signal circuit THROTTLE POSITION SENSOR CIR-
CUIT HIGH INPUT, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P1714Throttle Position Sensor
Power Supply CircuitAccelerator pedal position sensor or
throttle position sensor malfunction,
open or short input signal circuit THROTTLE POSITION SENSOR
POWER SUPPLY CIRCUIT, Diagnostic
Procedure with Diagnostic Trouble Code
(DTC).> DTC Item Diagnosis content Reference

4AT(H4DOTC)-32
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
P1718CAN Communication Cir-
cuitOpen or short AT communication sig-
nal circuit CAN COMMUNICATION CIRCUIT,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).> DTC Item Diagnosis content Reference

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)-34
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
 RHD model
Step Check Yes No
1 CHECK “P” RANGE SWITCH.
Connect the Subaru Select Monitor to data link
connector, and then change to LED display
screen.When the “P” range is
selected, does LED light up?Go to step 2.Go to step 22.
2 CHECK INDICATOR LIGHT.Does the combination meter
“P” range indicator illuminate?Go to step 3.Go to step 26.
3 CHECK “P” RANGE SWITCH.When the “R” range is selected,
does “P” range LED light up?Go to step 28.Go to step 4.
4 CHECK “R” RANGE SWITCH.When the “R” range is
selected, does LED light up?Go to step 5.Go to step 29.
5 CHECK INDICATOR LIGHT.Does the combination meter
“R” range indicator illuminate?Go to step 6.Go to step 32.
6 CHECK “R” RANGE SWITCH.When the “N” range is selected,
does “R” range LED light up?Go to step 34.Go to step 7.
7 CHECK “N” RANGE SWITCH.When the “N” range is
selected, does LED light up?Go to step 8.Go to step 35.
AT-01842
B5B14B22B4A16A4A10A6
32187654
9810311465
E
B37
i2
i10
B12
T3
T7
A:
B:B54
TCM
B55
6
14
P
R
N
D
3
2
1
B12
123456789101112
i10
123456789101112131415161718192021222324252627282930
1234567812 13 14 15 16 17 1891011
i2
B55
12 7
8956 34
10 11 12
19 20 2113 14 15 16
17 18 22 23 24
B:
INHIBITOR SWITCHCONBINATION
METERA:
B54
123
89
10411 12
13 14 15 1656
7
17
T7
123456
78910 11 12