Subaru Legacy III (2000-2003 year). Service manual — part 599
AT-130
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
8
CHECK HARNESS CONNECTOR BETWEEN
TCM AND POWER SWITCH.
Measure resistance of harness connector
between TCM and chassis ground.
Connector & terminal
(B55) No. 23 — Chassis ground:
Does the measured value exceed the specified
value?
1 M
Ω
Repair short circuit
in harness
between TCM and
power switch con-
nector.
9
CHECK INPUT SIGNAL FOR TCM.
1) Connect connectors to TCM and power
switch.
2) Turn ignition switch ON (with engine OFF).
3) Measure signal voltage for TCM while turn-
ing power switch OFF.
Connector & terminal
(B55) No. 23 (+) — Chassis ground (–):
Does the measured value exceed the spec-
ified value?
10 V
Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
10
CHECK INPUT SIGNAL FOR TCM.
Measure signal voltage for TCM while turning
power switch ON.
Connector & terminal
(B55) No. 23 (+) — Chassis ground (–):
Is the measured value less than the specified
value?
1 V
Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
11
CHECK POOR CONTACT.
Is there poor contact?
There is poor contact.
Repair poor con-
tact.
A temporary poor
contact of the con-
nector or harness
in power switch
circuit.
Step
Value
Yes
No
AT-131
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
MEMO:
AT-132
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
H: CHECK INHIBITOR SWITCH.
DIAGNOSIS:
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.
WIRING DIAGRAM:
AT-00788
9
INHIBITOR SWITCH
COMBINATION
METER
8
10
3
11
4
6
5
P
R
N
D
3
2
1
3
2
1
8
7
6
5
4
7
6
5
4
14
3
1
T7
T3
B12
B1
B2
B3
B4
B11
B12
B5
A14
A22
A21
A20
A19
A16
A15
H4
H6
H4
H6
C3
A8
B5
P4
M5
L4
L5
O4
N4
M4
i10
i11
i12
A:
i1
B36
B:
C:
NO. 5 15A
B
A
TTER
Y
IGNITION
RELAY
T7
1 2 3 4 5 6
7 8 9 10 11 12
B12
1 2 3 4
5 6 7 8
9 10 11 12
i12
1 2 3
4 5 6
7 8 9 10 11 12 13 14
B36
B4 B5 B6
A4 A5 A6
C5 C6
F6
D4 D5 D6
F1
H1
C4
G6
G1
C2
K1
M1 M2
K6
L1
D1 D2
A1 A2
B1 B2
I6
J6
L2
I1
J1
H6
M4 M5 M6
L4 L5 L6
N5 N6
O4 O5 O6
N4
P4 P5
N2
O1 O2
P1 P2
N3
O3
P3
P6
A3
B3
C3
E4 E5 E6
E1 E2
i10
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
B55
1 2 3 4
10 11 12
19 20 21
13
5 6
14 15
7
8
9
16
17
18
22
23
24
P
R
N
D
3
2
1
ILLUMINATION CONTROL CIRCUIT
i11
1 2 3 4
5 6 7
8 9 10 11 12 13 14 15 16
TCM
B55
H6
H4
: EXCEPT 3.0L MODEL AND
TURBO MODEL
: 3.0L MODEL AND TURBO MODEL
H6
H6
AT-133
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK “P” RANGE SWITCH.
When “P” range is selected, does LED light
up?
LED lights up.
2
CHECK INDICATOR LIGHT.
Does combination meter “P” range indicator
illuminate?
P range indicator lights up.
3
CHECK “P” RANGE SWITCH.
When the “R” range is selected, does “P”
range LED light up?
LED lights up.
4
CHECK “R” RANGE SWITCH.
When the “R” range is selected, does LED light
up?
LED lights up.
5
CHECK INDICATOR LIGHT.
Does combination meter “R” range indicator
illuminate?
R range indicator lights up.
6
CHECK “R” RANGE SWITCH.
When the “N” range is selected, does “R”
range LED light up?
LED lights up.
7
CHECK “N” RANGE SWITCH.
When the “N” range is selected, does LED light
up?
LED lights up.
8
CHECK INDICATOR LIGHT.
Does combination meter “N” range indicator
illuminate?
N range indicator lights up.
9
CHECK “N” RANGE SWITCH.
When the “D” range is selected, does “N”
range LED light up?
LED lights up.
10
CHECK “D” RANGE SWITCH.
When the “D” range is selected, does LED light
up?
LED lights up.
11
CHECK INDICATOR LIGHT.
Does combination meter “D” range indicator
illuminate?
D range indicator lights up.
12
CHECK “D” RANGE SWITCH.
When the “3” range is selected, does “D” range
LED light up?
LED lights up.
13
CHECK “3” RANGE SWITCH.
When the “3” range is selected, does LED light
up?
LED lights up.
14
CHECK INDICATOR LIGHT.
Does combination meter “3” range indicator
illuminate?
3 range indicator lights up.
15
CHECK “3” RANGE SWITCH.
When the “2” range is selected, does “3” range
LED light up?
LED lights up.
16
CHECK “2” RANGE SWITCH.
When the “2” range is selected, does LED light
up?
LED lights up.
17
CHECK INDICATOR LIGHT.
Does combination meter “2” range indicator
illuminate?
2 range indicator lights up.
18
CHECK “2” RANGE SWITCH.
When the “1” range is selected, does “2” range
LED light up?
LED lights up.
19
CHECK “1” RANGE SWITCH.
When the “1” range is selected, does LED light
up?
LED lights up.
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