Subaru Legacy III (2000-2003 year). Service manual — part 579
AT-50
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
6
CHECK ATF TEMPERATURE SENSOR.
1) Turn ignition switch to ON (engine OFF).
2) Measure resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 11 — No. 12:
Does the resistance value increase while
the ATF temperature decreases?
Resistance value increases.
Replace ATF sen-
sor.
7
PREPARE SUBARU SELECT MONITOR.
Do you have a Subaru Select Monitor?
Subaru Select Monitor is avail-
able.
8
CHECK INPUT SIGNAL FOR TCM.
1) Connect connector to transmission.
2) Warm-up the transmission until ATF tem-
perature is about 80
°
C (176
°
F).
NOTE:
If ambient temperature is below 0
°
C (32
°
F),
drive the vehicle until the ATF reaches its oper-
ating temperature.
3) Measure voltage between TCM connector
terminal.
Connector & terminal
(B54) No. 11 (+) — No. 20 (
−−−−
):
Is the measured value within the specified
range?
0.4 — 0.9 V
Even if “POWER”
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. Tempo-
rary poor contact
of the connector or
harness may be
the case. Repair
harness or con-
tact in the ATF
temperature sen-
sor and transmis-
sion connector.
9
CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Connect connector to transmission.
2) Turn ignition switch to ON (engine OFF).
Does the ATF temperature gradually
decrease?
ATF temperature gradually
increases.
Even if “POWER”
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. Tempo-
rary poor contact
of the connector or
harness may be
the case. Repair
harness or con-
tact in the ATF
temperature sen-
sor and transmis-
sion connector.
10
CHECK POOR CONTACT.
Is there poor contact in ATF temperature sen-
sor circuit?
There is poor contact.
Repair poor con-
tact.
Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
Step
Value
Yes
No
AT-51
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
MEMO:
AT-52
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
D: DTC 31 THROTTLE POSITION SENSOR
DIAGNOSIS:
Input signal circuit of throttle position sensor is open or shorted.
TROUBLE SYMPTOM:
Shift point too high or too low; excessive shift shock; excessive tight corner “braking”.
WIRING DIAGRAM:
EXCEPT 3.0 L MODEL
AT-00777
NT
TB
THROTTLE
POSITION SENSOR
SHIELD AND
SENSOR GROUND
JOINT CONNECTOR
E13
NT
TB
B21
E2
B54
B122
TB
:
B83
B22
E3
C17
C15
C16
A8
A22
A27
A7
15
13
8
A7
C21
C22
B6
00L
C17
C15
C16
A8
A27
A7
C21
C22
00R
B13
B3
B19
A7
C26
A35
C5
C16
B21
D14
WO
2
3
4
3
2
TCM
16
NT
TB
14
B54
1 2 3 4
10 11 12
19 20 21
13
5 6
14 15
7
8
9
16
17
18
22
23
24
B21
1 2
5
6 7
8
13
14 15
16
9 10
11 12
3 4
17 18
19 20
B22
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
E13
1 2 3
1 2 3 4
1 2 3 4 5 6 7 8 9 10 11 12
B83
EG
:
E13
NT
:
B83
B134
1 2
3 4
5 6
7 8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25
26 27 28 29
30 31 32 33
34 35
5 6 7
8
2
1
9
4
3
10
24
22 23
25
11 12 13 14 15
26
27 28
16 17 18 19
20 21
B135
B134
1 2
3 4
5 6
7 8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25
26 27 28 29
30 31 32 33
34 35
5
4
6 7
8
2
1
9
3
10
22
23
11 12 13 14 15
24 25
26 27
16 17 18
28
29
19 20
21
30
B136
B137
D:
B84
E:
B134
A:
B135
B:
ECM
B136
C:
: WITH OBD EXCEPT FOR
G.C.C COUNTRIES AND
LATIN AMERICA MODEL
: NON-TURBO MODEL
EG
: WITH OBD G.C.C
COUNTRIES AND LATIN
AMERICA MODEL
FG
NT
: TURBO MODEL
TB
: WITH OBD MODEL
: WITHOUT OBD RHD MODEL
WO
: WITHOUT OBD MODEL
OO
00R
: WITHOUT OBD LHD MODEL
00L
5 6 7
8
2
1
9
4
3
10
24
22 23
25
11 12 13 14 15
26
27 28
16 17 18 19
20 21
B135
OO
4
6
EG
3
4
OO
:
: TB
12
11
9
20
19
18
1
3
2
FG
OO
EG
:
TB
1
6
FG
2
1
,
15
13
3
16
14
B7
B9
B19
C17
C18
C8
D8
D9
A15
A12
E1
TB
00R
00L
E: B84
B: B135
D: B137
C: B136
A: B134
1 2 3 4
10 11 12
19 20 21
13
5
6
14 15
7
8 9
16 17
18
22
1
2
7
8
9
5
6
3
4
10 11 12
19 20 21
29 30 31
13 14 15 16 17
27 28
18
22 23 24 25 26
5 6
7
2
1
9
8
4
3
22
20
23
21
24
10 11 12 13 14
25 26
15 16 17
18 19
B136
WO
TB
B137
1 2
3 4
9
8
7
6
5
10 11 12 13
14 15
16 17 18
19 20
1 2
7
8 9
5
6
3
4
10 11 12
19 20 21
13 14 15 16
17 18
22 23 24
5 6
7 8
2
1
9
4
3
10
24
22
23
25
11 12 13 14 15
26 27 28
16 17 18 19
20 21
5 6
7 8
2
1
9
4
3
10 11 12
13 14 15
16 17
1 2 3 4 5 6
B122
B83
FG
:
AT-53
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
3.0 L MODEL
THROTTLE
POSITION SENSOR
E13
B20
E1
B83
B252
E49
B7
B9
B19
D21
D31
D8
D9
C18
A22
5
1
2
3
6
7
C8
C17
2
3
16
15
13
3
2
1
8
5
14
15
13
ECM
B136
C:
B137
D:
B134
A:
B135
B:
TCM
B54
B54
B20
1 2 3 4
5 6 7 8
9 10 11 12
13 14 15 16
B136
1 2
7
8 9
5
6
3
4
10 11 12
19 20 21
13 14 15 16
17 18
22 23 24
B137
1
2
7
8
9
5
6
3
4
10 11 12
19 20 21
29 30 31
13 14 15 16 17
27 28
18
22 23 24 25 26
E13
1 2 3
B252
B83
1 2
7
8
9
5 6
3 4
10 11 12
19 20 21
13
14 15
16
17
18
22
23
24
1 2 3 4
5 6 7 8
SHIELD AND
SENSOR GROUND
JOINT CONNECTOR
A15
A7
B134
1 2 3 4
10 11 12
19 20 21
13
5
6
14 15
7
8 9
16 17
18
22
B135
5 6
7 8
2
1
9
4
3
10
24
22
23
25
11 12 13 14 15
26 27 28
16 17 18 19
20 21
AT-00778
1 2 3 4
5 6 7 8 9 10
11 12
19
20
13 14 15 16 17 18
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