2004 SUBARU FORESTER diagram

4AT(H4DOTC)-52
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
E: DTC P0719 TORQUE CONVERTER/BRAKE SWITCH “B” CIRCUIT LOW
DTC DETECTING CONDITION:
Stop light switch malfunction or input signal open circuit.
TROUBLE SYMPTOM:
Gear is not shifted down when climbing hill.
WIRING DIAGRAM:
Step Check Yes No
1 CHECK OPERATION OF BRAKE LIGHT.
Depress the brake pedal.Does the brake light illumi-
nate?Go to step 2.Check the brake
light circuit.
2 CHECK TCM INPUT SIGNAL.
1) Depress the brake pedal.
2) Measure the voltage of harness between
TCM and stop light switch.
Connector & terminal
(B55) No. 20 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 5.Go to step 3.
AT-01844
B55
B65
E
2 3
SBF-1
SBF-2
NO.16
20
B55
B65
TCM
12 7
8956 34
10 11 12
19 20 2113 14 15 16
17 18 22 23 24
1234
BATTERY
STOP LIGHT
SWITCH
TO STOP LIGHT

4AT(H4DOTC)-54
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
F: DTC P0720 OUTPUT SPEED SENSOR CIRCUIT
DTC DETECTING CONDITION:
 The vehicle speed signal is abnormal.
 The circuit in combination meter is faulty.
 The harness connector between TCM and vehicle speed sensor is in short or open.
TROUBLE SYMPTOM:
 Erroneous idling.
 Engine stalls.
 Poor driving performance.
WIRING DIAGRAM:
AT-01845
18 14
B11
B299
T4
B6
B15C1
B11
12 34
5678
9
13 14 15
20 19 1716 10 11 1218
i10
B37
i2
B38
i3
TCM
B55 B:
B56 C:
18
12
1234567813 14 15 16 17 18 1911 101225 26 27 28 29 30 31
921203223 2224
i3
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:
FRONT
VEHICLE SPEED
SENSOR CONBINATION
METER
SPEEDOMETER
: RHD MODEL SHIELD
JOINT
CONNECTOR
LHD
RHD
RHD
: LHD MODEL
LHD RHD
7
834
LHD
i10
123456789101112131415161718192021222324252627282930
B:B55
12 7
8956 34
10 11 12
19 20 2113 14 15 16
17 18 22 23 24
B37
34 12 89
10 11
12 13 14 15 16 17 18 19 20 21 22 23 24567
B299
12345678

4AT(H4DOTC)-57
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
G: DTC P0724 TORQUE CONVERTER/BRAKE SWITCH “B” CIRCUIT HIGH
DTC DETECTING CONDITION:
Stop light switch malfunction or open input signal circuit.
TROUBLE SYMPTOM:
Gear is not shifted down when climbing hill.
WIRING DIAGRAM:
Step Check Yes No
1 CHECK TCM INPUT SIGNAL.
1) Disconnect the harness connector from
TCM.
2) Measure the voltage of harness between
TCM and stop light switch.
Connector & terminal
(B55) No. 20 (+) — Chassis ground (
−):Is the voltage more than 10 V? Go to step 2.Go to step 4.
AT-01844
B55
B65
E
2 3
SBF-1
SBF-2
NO.16
20
B55
B65
TCM
12 7
8956 34
10 11 12
19 20 2113 14 15 16
17 18 22 23 24
1234
BATTERY
STOP LIGHT
SWITCH
TO STOP LIGHT

4AT(H4DOTC)-59
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
H: DTC P0725 ENGINE SPEED INPUT CIRCUIT
DTC DETECTING CONDITION:
Engine speed input signal circuit is open or shorted.
TROUBLE SYMPTOM:
 No lock-up (after engine warm-up).
 POWER indicator light remains on when vehicle speed is “0”.
WIRING DIAGRAM:
Step Check Yes No
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM and
ECM.
3) Measure the resistance of harness
between TCM and ECM connector.
Connector & terminal
(B55) No. 13 — (B134) No. 23:Is the resistance less than 1
Ω?Go to step 2.Repair the open
circuit in harness
between TCM and
ECM connector.
AT-01846
B55
23
13
B134
ECM
B55
TCM
B134
12
7
8956 3410 11 12
19 20 2113 14 15 16
17 1822
23
24
56 7
82 1
94 310
24 22 23 25 11 12 13 14 15
26 27
2816 17
18 19 20 21
33 34 29
32 30 31

4AT(H4DOTC)-65
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
O: DTC P0743 TORQUE CONVERTER CLUTCH CIRCUIT ELECTRICAL
DTC DETECTING CONDITION:
Output signal circuit of lock-up duty solenoid is open or shorted.
TROUBLE SYMPTOM:
No “lock-up” (after engine warm-up).
WIRING DIAGRAM:
Step Check Yes No
1 CHECK DTC.Are multiple DTCs indicated? Go to another
DTC.Go to step 2.
2 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
(B56) No. 5 — (B11) No. 12:Is the resistance less than 1
Ω?Go to step 3.Repair the open
circuit in harness
between TCM and
transmission con-
nector.
AT-01117
B11
B56
AT12
1
234
56
78
9
1314
15
20
19 1716 10 1112
18
5
B56
B11
AT12
T4 TCM12 4
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
13
4562
LOCK-UP
DUTY
SOLENOID
TRANSMISSION

4AT(H4DOTC)-69
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
P: DTC P0748 PRESSURE CONTROL SOLENOID “A” ELECTRICAL
DTC DETECTING CONDITION:
Output signal circuit of line pressure linear solenoid is open or shorted.
TROUBLE SYMPTOM:
Excessive shift shock.
WIRING DIAGRAM:
Step Check Yes No
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from transmis-
sion and TCM.
3) Measure the resistance of harness
between TCM and transmission connector.
Connector & terminal
(B56) No. 19 — (B11) No. 2:
(B56) No. 20 — (B11) No. 1:Is the resistance less than 1
Ω?Go to step 2.Repair the open
circuit in harness
between TCM and
transmission con-
nector.
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND CHASSIS GROUND.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B56) No. 19 — Chassis ground:
(B56) No. 20 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 3.Repair the short
circuit in harness
between TCM and
transmission con-
nector.
3 CHECK LINE PRESSURE LINEAR SOLE-
NOID.
Measure the resistance between transmission
connector receptacle’s terminals.
Connector & terminal
(T4) No. 1 — No. 2:Is the resistance 4 — 6 Ω? Go to step 4.Go to step 10.
AT-01847
19
B56
B11
AT11
T4 TCM
B11
1
234
56
78
9
1314
15
20
19 1716 10 1112
18
422021
B56AT11
12 78 956 34
10 11 12 19 20 21
29 30 31 13 14 15 16 17
27 2818
22 23 24 25 263412
TRANSMISSIONLINE
PRESSURE
LINEAR
SOLENOID

4AT(H4DOTC)-72
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Q: DTC P0753 SHIFT SOLENOID “A” ELECTRICAL
DTC DETECTING CONDITION:
Output signal circuit of low clutch timing solenoid is open or shorted.
TROUBLE SYMPTOM:
Excessive shift shock.
WIRING DIAGRAM:
Step Check Yes No
1 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
(B56) No. 9 — (B11) No. 4:Is the resistance less than 1
Ω?Go to step 2.Repair the open
circuit in harness
between TCM and
transmission con-
nector.
AT-01848
B11
B56
AT12
1
234
56
78
9
1314
15
20
19 1716 10 1112
18
9
B56
B11
AT12
T4 TCM4
2
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
13
4562
LOW CLUTCH
DUTY
SOLENOID
TRANSMISSION

4AT(H4DOTC)-76
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
R: DTC P0758 SHIFT SOLENOID “B” ELECTRICAL
DTC DETECTING CONDITION:
Output signal circuit of 2-4 brake duty solenoid is open or shorted.
TROUBLE SYMPTOM:
Excessive shift shock.
WIRING DIAGRAM:
Step Check Yes No
1 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 shift transmission connector.
Connector & terminal
(B56) No. 6 — (B11) No. 3:Is the resistance less than 1
Ω?Go to step 2.Repair the open
circuit in harness
between TCM and
transmission con-
nector.
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND CHASSIS GROUND.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B56) No. 6 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 3.Repair the short
circuit in harness
between TCM and
transmission con-
nector.
3 CHECK 2-4 BRAKE DUTY SOLENOID.
Measure the resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 3 — No. 20:Is the resistance 2.0 — 4.5 Ω? Go to step 4.Go to step 10.
4 PREPARE SUBARU SELECT MONITOR.Do you have a Subaru Select
Monitor?Go to step 7.Go to step 5.
AT-01119
6
B56
B11
AT12
T4 TCM
B11
1
234
56
78
9
1314
15
20
19 1716 10 1112
18
3 6
B56AT12
12 78 956 34
10 11 12 19 20 21
29 30 31 13 14 15 16 17
27 2818
22 23 24 25 2613
4562
TRANSMISSION2-4 BRAKE
DUTY
SOLENOID