Subaru Legacy III (2000-2003 year). Manual - part 574

AT-30

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE FOR POWER INDICATOR LIGHT

12.Diagnostic Procedure for POWER Indicator Light

A: POWER INDICATOR LIGHT DOES NOT COME ON OR GO OFF

DIAGNOSIS:
The POWER Indicator light circuit is open or shorted.
TROUBLE SYMPTOM:
• When ignition switch is turned to ON (engine OFF), POWER indicator light does not illuminate.
• When on-board diagnostics is performed, POWER indicator light remains illuminated.
WIRING DIAGRAM:

AT-00773

INHIBITOR SWITCH

COMBINATION
METER

B14

B12

C11

i10

i11

i12

B36

NO. 5

BATTERY

IGNITION
RELAY

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

TCM

B55

B56

1 2 3 4 5 6
7 8 9 10 11 12

B55

1 2 3 4

10 11 12
19 20 21

5 6

14 15

B56

1 2

5 6

3 4

10 11 12
19 20 21

14 15

A13

B12

H6RT

H6L

H4N

POWER

H6RT

H4N : LHD 3.0L MODEL

: RHD 3.0L MODEL AND
TURBO MODEL

H4N : EXCEPT 3.0L MODEL AND

NON-TURBO MODEL

: 3.0L MODEL AND TURBO MODEL

i11

1 2 3
8 9 10

11 12 13 14 15 16

5 6 7

B36

B4 B5 B6

A4 A5 A6

C5 C6

D4 D5 D6

M1 M2

D1 D2

A1 A2
B1 B2

M4 M5 M6

L4 L5 L6

N5 N6

O4 O5 O6

P4 P5

O1 O2

P1 P2

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

AT-31

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE FOR POWER INDICATOR LIGHT

Step

Value

Yes

CHECK POWER INDICATOR LIGHT.
Turn ignition switch to ON (engine OFF).
Does POWER indicator light illuminate?

POWER indicator illuminates.

Go to step 3.

Go to step 2.

CHECK POWER INDICATOR LIGHT.
1) Turn ignition switch to OFF.
2) Remove combination meter.
3) Remove POWER indicator light bulb from

combination meter.
Is POWER indicator light bulb OK?

Bulb is normal.

Go to step 4.

Replace POWER
indicator light bulb.

CHECK POWER INDICATOR LIGHT.
Perform “Read Diagnostic Trouble Code
(DTC)”. <Ref. to AT-24, WITHOUT SUBARU
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code (DTC).>
Does POWER indicator light blink?

Power indicator light illumi-
nates.

A temporary poor
contact of the con-
nector or harness
may be the cause.
Repair harness or
connector in TCM,
inhibitor switch
and combination
meter.

Go to step 9.

CHECK FUSE (No. 5).
Remove fuse (No. 5).
Is the fuse (No. 5) blown out?

Fuse is blown.

Replace fuse (No.
5). If replaced fuse
(No. 5) is blown
out easily, repair
short circuit in har-
ness between fuse
(No. 5) and combi-
nation meter.

Go to step 5.

CHECK HARNESS CONNECTOR BETWEEN
COMBINATION METER AND IGNITION RE-
LAY.
1) Turn ignition switch to ON (engine OFF).
2) Measure voltage between combination

meter connector and chassis ground.

Connector & terminal

Except 3.0 L model

(i12) No. 3 (+) — Chassis ground (

−−−−

3.0 L model

(i11) No. 5 (+) — Chassis ground (

−−−−

(i10) No. 8 (+) — Chassis ground (

−−−−

Does the measured value exceed the spec-
ified value?

9 V

Go to step 6.

Repair open or
short circuit in har-
ness between
combination meter
and battery.

CHECK COMBINATION METER.
Measure voltage between combination meter
connector and chassis ground.

Connector & terminal

Except 3.0 L model and TURBO model

(i11) No. 6 (+) — Chassis ground (

−−−−

LHD: 3.0 L model

(i11) No. 12 (+) — Chassis ground (

−−−−

RHD: 3.0 L model and TURBO model

(i10) No. 13 (+) — Chassis ground (

−−−−

Is the measured value less than the specified
value?

1 V

Repair combina-
tion meter. <Ref.
to IDI-14, Combi-
nation Meter
Assembly.>

Go to step 7.

AT-32

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE FOR POWER INDICATOR LIGHT

CHECK OPEN CIRCUIT OF HARNESS.
1) Turn ignition switch to OFF.
2) Disconnect TCM and combination meter

connector.

3) Measure resistance of harness between

combination meter.

Connector & terminal

Except 3.0 L model and TURBO model

(B56) No. 11 — (i11) No. 6:

LHD: 3.0 L model

(B56) No. 11 — (i12) No. 12

RHD: 3.0 L and TURBO models

(B56) No. 11 — (i0) No. 13

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

Ω

Go to step 8.

Repair open circuit
in harness
between TCM and
combination
meter, and poor
contact in cou-
pling connector.

CHECK INPUT SIGNAL FOR TCM.
1) Connect connector to TCM and combina-

tion meter.

2) Turn ignition switch to ON (engine OFF).
3) Measure voltage between TCM connector

and chassis ground.

Connector & terminal

(B56) No. 11 (+) — Chassis ground (

−−−−

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

1 V

Even if POWER
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. A tempo-
rary poor contact
of the connector or
harness may be
the cause. Repair
harness or con-
nector in TCM.

Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>

CHECK SUBARU SELECT MONITOR.
Do you have Subaru Select Monitor?

Subaru Select Monitor is avail-
able.

Go to step 10.

Go to step 11.

CHECK INHIBITOR SWITCH.
1) Connect Subaru Select Monitor to data link

connector.

2) Turn ignition switch to ON.
3) Subaru Select Monitor to ON.
4) Read data of range switch using Subaru

Select Monitor.

•Range switch is indicated in ON

⇔

OFF.