2004 SUBARU FORESTER automatic transmission

4AT(H4SO)-90
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure without Diagnostic Trouble Code (DTC)
4 CHECK KICK-DOWN SWITCH.
Measure the resistance for kick-down switch
when releasing the accelerator pedal.
Te r m i n a l s
No. 1 — No. 2:Is the resistance more than 1
MΩ?Go to step 5.Replace the kick-
down switch. to SP(H4SO)-4,
Accelerator
Pedal.>
5 CHECK HARNESS CONNECTOR BETWEEN
TCM AND KICK-DOWN SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from kick-down
switch.
3) Measure the resistance of harness connec-
tor between TCM and kick-down switch.
Connector & terminal
(B55) No. 11 — (B129) No. 2:Is the resistance less than 1
Ω?Go to step 6.Repair the open
circuit in harness
between TCM and
kick-down switch.
6 CHECK HARNESS CONNECTOR BETWEEN
TCM AND KICK-DOWN SWITCH.
Measure the resistance of harness connector
between TCM and chassis ground.
Connector & terminal
(B55) No. 11 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 7.Repair the short
circuit in harness
between TCM and
chassis ground.
7 CHECK INPUT SIGNAL FOR TCM.
1) Turn the ignition switch to OFF.
2) Connect the connector to kick-down switch.
3) Turn the ignition switch to ON (engine OFF).
4) Measure the signal voltage for TCM when
depressing the accelerator pedal.
Connector & terminal
(B55) No. 11 (+) — Chassis ground (
−):Is the voltage less than 1 V? Go to step 8.Go to step 9.
8 CHECK INPUT SIGNAL FOR TCM.
Measure the signal voltage for TCM when
releasing the accelerator pedal.
Connector & terminal
(B55) No. 11 (+) — Chassis ground (
−):Is the voltage more than 6.5 V? A temporary poor
contact of the con-
nector and har-
ness may be the
cause. Repair the
harness and con-
nector in TCM.Go to step 9.
9 CHECK POOR CONTACT.Is there poor contact? Repair the poor
contact.Replace the TCM.
Transmission Con-
trol Module
(TCM).> Step Check Yes No

4AT(H4SO)-91
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure without Diagnostic Trouble Code (DTC)
F: CHECK POWER MODE SWITCH
DETECTING CONDITION:
 The LED does not come on when POWER switch is ON.
 The POWER switch circuit is open or shorted.
TROUBLE SYMPTOM:
No power mode occurs.
WIRING DIAGRAM:
 LHD model
AT-01831
SBF-4 SBF-1
No.14
IGNITION
SWITCH
i10
i2
B37 B:
B55
TCM B:B56
R92 C: C:
i11
C2
B9
C11
B23
COMBINATION
METER
E
B55R92B56
1234
56789
10 1112
13 14 15 16 17 18
192021
2223 241234
56789
101112
13
1415 16 17 18
19
202122 23
24
123456
78 9 10 1112
13
14
15 16 17
1819
2021
2223
24
2526
2728
2930
i10B37
1234
578
910112324
121314
156
16 17 1819
20 2122123456
78 910
i11
B16
POWER AND
HOLD SWITCH
BATTERY
E
POWEROFF
3
5
4 POWER
56
i3
B38
12
34
56219
32
B38
1234
5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
25
21
20B98
R2
HOLD
B98
B:
C:
C: B:

4AT(H4SO)-92
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure without Diagnostic Trouble Code (DTC)
 RHD model
AT-01832
SBF-4 SBF-1
No.14
IGNITION
SWITCH
i10BATTERY
A:
B55
TCM B:B56
B133 C: B:
i11
C2
B9
C11
B23
COMBINATION
METER
E
E
B55
B56
1234 56 7 8 9
10 11 12 13 14 15 16 17 18
19 20 21 22 23 241234 5 6 7 8 9
10 11 12 13 14 15 16 17 18
19 20 21 22 23 24
123456 7 891011121314
15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
i10
12345678910
i11
B16
POWER AND
HOLD SWITCH
3
5
4 POWER
POWER OFF
i2
34 12 8910
1112 13 14 15 16 17 18 19 20 21 22567
B133
12
3456
i3
B3816i2
B3712
219
32
i3
1234
5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
25
HOLD
C:
A: B:
B:

4AT(H4SO)-93
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure without Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK POWER SWITCH OPERATION.When the POWER switch is
turned to OFF, does LED light
up?Go to step 5.Go to step 2.
2 CHECK POWER SWITCH OPERATION.When the POWER switch is
turned to ON, does LED light
up?Go to step CHECK
INHIBITOR
SWITCH. 4AT(H4SO)-95,
CHECK INHIBI-
TOR SWITCH,
Diagnostic Proce-
dure without Diag-
nostic Trouble
Code (DTC).>Go to step 3.
3 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.Inspect the combi-
nation meter.
Combination
Meter Assembly.>
4 CHECK POWER SWITCH GROUND LINE.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from POWER
switch.
3) Measure the resistance of harness connec-
tor between POWER switch and chassis
ground.
Connector & terminal
LHD model
(R92) No. 4 — Chassis ground:
RHD model
(B133) No. 4 — Chassis ground:Is the resistance less than 1
Ω?Go to step 5.Repair the open
circuit in harness
between POWER
switch and chas-
sis ground.
5 CHECK POWER SWITCH.
1) Turn the POWER switch to ON.
2) Measure the resistance between terminals
of POWER switch.
Te r m i n a l s
No. 5 — No. 4:Is the resistance less than 1
Ω?Go to step 6.Repair the
POWER switch.
6 CHECK POWER SWITCH.
1) Turn the POWER switch to OFF.
2) Measure the resistance between terminals
of POWER switch.
Te r m i n a l s
No. 5 — No. 4:Is the resistance more than 1
MΩ?Go to step 7.Repair the
POWER switch.
7 CHECK HARNESS CONNECTOR BETWEEN
TCM AND POWER SWITCH.
Measure the resistance of harness connector
between TCM and POWER switch.
Connector & terminal
(B55) No. 23 — (B133) No. 3:Is the resistance less than 1
Ω?Go to step 8.Repair the open
circuit in harness
between TCM and
POWER switch
connector.
8 CHECK HARNESS CONNECTOR BETWEEN
TCM AND POWER SWITCH.
Measure the resistance of harness connector
between TCM and chassis ground.
Connector & terminal
(B55) No. 23 — Chassis ground:Is the resistance more than 1
MΩ?Go to step 9.Repair the short
circuit in harness
between TCM and
POWER switch
connector.

4AT(H4SO)-94
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure without Diagnostic Trouble Code (DTC)
9 CHECK INPUT SIGNAL FOR TCM.
1) Connect the connectors to TCM and
POWER switch.
2) Turn the ignition switch to ON (engine OFF).
3) Measure the signal voltage for TCM while
turning POWER switch to OFF.
Connector & terminal
(B55) No. 23 (+) — Chassis ground (–):Is the voltage more than 10 V? Go to step 10.Replace the TCM.
Transmission Con-
trol Module
(TCM).>
10 CHECK INPUT SIGNAL FOR TCM.
Measure the signal voltage for TCM while turn-
ing POWER switch to ON.
Connector & terminal
(B55) No. 23 (+) — Chassis ground (–):Is the voltage less than 1 V? Go to step 11.Replace the TCM.
Transmission Con-
trol Module
(TCM).>
11 CHECK POOR CONTACT.Is there poor contact in
POWER switch circuit?Repair the poor
contact.A temporary poor
contact of the con-
nector or harness
or connector in
POWER switch cir-
cuit. Step Check Yes No

4AT(H4SO)-95
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure without Diagnostic Trouble Code (DTC)
G: CHECK INHIBITOR SWITCH
DETECTING CONDITION:
The input signal circuit of inhibitor switch is open or shorted.
TROUBLE SYMPTOM:
 Shift characteristics are erroneous.
 Engine brake is not effected when selector lever is in “3” range.
 Engine brake is not effected when selector lever is in “2” range.
 Engine brake is not effected when selector lever is in “1” range.

4AT(H4SO)-96
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure without Diagnostic Trouble Code (DTC)
WIRING DIAGRAM:
 LHD model
AT-00597
BATTERY
SBF-4
COMBINATION
METER IGNITION
SWITCH SBF-1
INHIBITOR SWITCH
E
E
1
3
14
4
5
6
7
10
11
2
3
5
4
1
PRND321
9
8
10
3
11
4
6
53
2
1
8
7
6
5
4
T7
T7B12
B55
B55
B37T3
B12
1234
1234 56
56
12345 7897
78
89
9 10 1112
10 11
10
1112
13
12
1314 15
141516
1617 18
17 18192021
19 20212223 24
22 2324
1 2
i3
B38
TCM
i10
i10
1234
5678
9
10
11
12
No.14
19
2
3
4
5
6
7
ILLUMINATION CONTROL CIRCUIT
3 D N R P
5i2
B37
123456
78 9 10 1112
13
14
15 16 17
1819
2021
2223
24
2526
2728
2930
219
32
1234 5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
25
B38
6

4AT(H4SO)-97
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure without Diagnostic Trouble Code (DTC)
 RHD model
AT-01833
BATTERY
SBF-4
COMBINATION
METER IGNITION
SWITCH SBF-1
INHIBITOR SWITCH
E
E
1
3
14
4
5
6
7
98
7
6
5
4
3
P RND3 2 1
9
8
10
3
11
4
6
53
2
1
8
7
6
5
4
T7
T7B12
B55
B55T3B12
12 34
123456
56 789
789 10 1112
10 1112
13 14 15 16 17 18
192021
2223 24
1 2
TCM
i10
12 34
56 78
9
10
11
12
No.14
ILLUMINATION CONTROL CIRCUIT
3 D N R P
9
3
4
5
6
7 21
123456
78 9 10 1112
13
14
15 16 17
1819
2021
2223
24
2526
2728
2930
i10
219
32
i3
1234
5610 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
25
16i3
B38i2
B37
i2
12345 678910
11
1219 20 21
13 14 15 1617
18 22