Subaru Legacy III (2000-2003 year). Manual — part 605

AT-154

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)

34

CHECK harness connector between TCM
and Steering roll connector.
1) Disconnect connector from TCM.
2) Measure harness resistance between TCM

connector and steering roll connector.

Connector & terminal

(B55) No. 1 — (B68) No. 3:

Is the measured value less than the speci-
fied value?

1

Ω

The circuit is
returned to a nor-
mal condition.
Temporary poor
contact of the har-
ness may be the
case. Repair poor
contact of steering
roll connector and
steering shift
switch harness or
connector.

Repair poor con-
tact or harness
disconnection
between connec-
tors of TCM con-
nector and
steering roll con-
nector

35

CHECK POOR CONTACT.
Is there poor contact in SPORT shift switch cir-
cuit?

There is poor contact.

Repair poor con-
tact.

Intermittent poor
contact in SPORT
shift switch circuit
connector or har-
ness

Step

Value

Yes

No

AT-155

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)

MEMO:

AT-156

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)

K: CHECK SPORT SHIFT INDICATOR.

DIAGNOSIS:
SPORT shift indicator output signal circuit is open or shorted.
TROUBLE SYMPTOM:
• SPORT shift indicator does not illuminate or remains illuminated.
• SPORT shift indicator display does not change.
WIRING DIAGRAM:

AT-00791

BATTERY

No.

5

IGNITION

RELA

Y

i11

i10

i1

B36

B56

COMBINATION
METER

TCM

E

B5

A4

A8

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

A1

A2

A3

M6

J6

K6

L6

12

4

3

13

SPORT SHIFT

INDICATOR

B56

1 2

7

8

9

5 6

3 4

10 11 12
19 20 21

13

14 15

16

17

18

22

23

24

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

i11

1 2 3
8 9 10

4

11 12 13 14 15 16

5 6 7

A:

B:

AT-157

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK SPORT SHIFT INDICATOR.
Does SPORT shift indicator operate normally
when driving in SPORT shift mode?

SPORT shift indicator operates
normally.

<Ref. to AT-158,
CHECK BUZZER.,
Diagnostic Proce-
dure for No-diag-
nostic Trouble
Code (DTC).>

Go to step 2.

2

CHECK COMBINATION METER.
Do meters and indicators other than SPORT
shift indicator operate normally?

Combination meter operates
normally.

Go to step 3.

Check combina-
tion meter.

3

CHECK HARNESS CONNECTOR BETWEEN
TCM AND COMBINATION METER.
1) Turn ignition switch to OFF.
2) Disconnect connector from TCM and com-

bination meter.

3) Measure resistance of harness between

TCM and combination meter.

Connector & terminal

(B56) No. 3 — (i10) No. 2:
(B56) No. 4 — (i10) No. 1:
(B56) No. 12 — (i10) No. 4:
(B56) No. 13 — (i10) No. 3:

Is the measured value less than the speci-
fied value?

1

Ω

Go to step 4.

Repair open circuit
in harness
between TCM and
combination meter
connector and
poor contact in
coupling connec-
tor.

4

CHECK HARNESS CONNECTOR BETWEEN
TCM AND COMBINATION METER.
Measure resistance between TCM and chassis
ground.

Connector & terminal

(B56) No. 3 — Chassis ground:
(B56) No. 4 — Chassis ground:
(B56) No. 12 — Chassis ground:
(B56) No. 13 — Chassis ground:

Does the measured value exceed the spec-
ified value?

1 M

Ω

Go to step 5.

Repair short circuit
in harness
between TCM and
combination meter
connector.

5

CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1) Connect connector to TCM and combina-

tion meter.

2) Turn ignition switch to ON. (Engine is

stopped.)

3) Measure voltage between TCM and chas-

sis ground.

Connector & terminal

(B56) No. 3 (+) — Chassis ground (–):
(B56) No. 4 (+) — Chassis ground (–):
(B56) No. 12 (+) — Chassis ground (–):
(B56) No. 13 (+) — Chassis ground (–):

Does the measured value exceed the spec-
ified value?

4 V

Go to step 6.

Replace combina-
tion meter.

6

CHECK POOR CONTACT.
Is there poor contact in SPORT shift indicator
circuit?

There is poor contact.

Repair poor con-
tact.

Replace TCM.