Subaru Legacy III (2000-2003 year). Manual - part 598

AT-126

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)

F: CHECK KICK–DOWN SWITCH.

DIAGNOSIS:
• The kick-down switch is not ON when the throttle is fully open but is OFF when the throttle is partially open
or fully closed.
• Kick-down switch circuit is open or shorted.
TROUBLE SYMPTOM:
No kick-down occurs (when the throttle is fully open).
WIRING DIAGRAM:

Step

Value

Yes

CHECK KICK-DOWN SWITCH OPERATION.
When the accelerator pedal is depressed,
does “ON” displayed?

ON is displayed.

Go to step CHECK
POWER MODE
SWITCH. <Ref. to
AT-128, CHECK
POWER MODE
SWITCH., Diag-
nostic Procedure
for No-diagnostic
Trouble Code
(DTC).>

Go to step 2.

CHECK KICK-DOWN SWITCH GROUND
LINE.
1) Disconnect connector from kick-down

switch.

2) Measure resistance of harness connector

between kick-down switch and chassis
ground.

Connector & terminal

(B129) No. 1 — Chassis ground:

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

Ω

Go to step 3.

Repair open circuit
in harness
between kick-
down switch and
chassis ground.

AT-00594

B55

TCM

KICK-DOWN

SWITCH

B129

1 2 3 4

10 11 12
19 20 21

5 6

14 15

1
2

AT-127

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)

CHECK KICK-DOWN SWITCH.
Measure resistance for kick-down switch when
depressing the accelerator pedal.

Terminals

No. 1 — No. 2:

Is the measured value less than the specified
value?

Ω

Go to step 4.

Replace kick-down
switch.

CHECK KICK-DOWN SWITCH.
Measure resistance for kick-down switch when
pressing the accelerator pedal.

Terminals

No. 1 — No. 2:

Does the measured value exceed the specified
value?

1 M

Ω

Go to step 5.

Replace kick-down
switch.

CHECK HARNESS CONNECTOR BETWEEN
TCM AND KICK-DOWN SWITCH.
1) Turn ignition switch OFF.
2) Disconnect connectors from kick-down

switch.

3) Measure resistance of harness connector

between TCM and kick-down switch.

Connector & terminal

(B55) No. 11 — (B129) No. 2:

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

Ω

Go to step 6.

Repair open circuit
in harness
between TCM and
kick-down switch.

CHECK HARNESS CONNECTOR BETWEEN
TCM AND KICK-DOWN SWITCH.
Measure resistance of harness connector
between TCM and chassis ground.

Connector & terminal

(B55) No. 11 — Chassis ground:

Does the measured value exceed the specified
value?

1 M

Ω

Go to step 7.

Repair short circuit
in harness
between TCM and
chassis ground.

CHECK INPUT SIGNAL FOR TCM.
1) Turn ignition switch to OFF.
2) Connect connector to kick-down switch.
3) Turn ignition switch ON (with engine OFF).
4) Measure signal voltage for TCM when

depressing the accelerator pedal.

Connector & terminal

(B55) No. 11 (+) — Chassis ground (

−−−−

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

1 V

Go to step 8.

Go to step 9.

CHECK INPUT SIGNAL FOR TCM.
Measure signal voltage for TCM when press-
ing the accelerator pedal.

Connector & terminal

(B55) No. 11 (+) — Chassis ground (

−−−−

Does the measured value exceed the specified
value?

6.5 V

A temporary poor
contact of the con-
nector and har-
ness may be the
cause. Repair har-
ness and connec-
tor in the TCM.

Go to step 9.

CHECK POOR CONTACT.
Is there poor contact?

There is poor contact.

Repair poor con-
tact.

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

Step

Value

Yes

AT-128

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)

G: CHECK POWER MODE SWITCH.

DIAGNOSIS:
• LED does not come on when power switch is ON.
• Power switch circuit is open or shorted.
TROUBLE SYMPTOM:
No power mode occurs.
WIRING DIAGRAM:

AT-00787

BATTERY

No.5

IGNITION

RELAY

i11

1 2 3 4

5 6 7

8 9 10 11 12 13 14 15 16

i12

1 2 3

4 5 6

7 8 9 10 11 12 13 14

B55

TCM

B56

B133

POWER

MODE

SWITCH

OFF

B55

B56

1 2 3 4

10 11 12
19 20 21

5 6

14 15

1 2 3 4

10 11 12
19 20 21

5 6

14 15

COMBINATION
METER

i10

i11

i12

B36

B12

H6L

H4N

POWER

H6RT : RHD 3.0L MODEL AND TURBO MODEL

H6L : LHD 3.0L MODEL

H4N : EXCEPT 3.0L MODEL AND TURBO MODEL

: 3.0L MODEL AND TURBO MODEL

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

B133

3 4 5 6

A13

H6RT

C11

B23

AT-129

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

CHECK POWER SWITCH OPERATION.
When power switch is turned OFF, does LED
light up?

LED lights up.

Go to step 5.

Go to step 2.

CHECK POWER SWITCH OPERATION.
When power switch is turned ON, does LED
light up?

LED lights up.

Go to step CHECK
INHIBITOR
SWITCH. <Ref. to
AT-132, CHECK
INHIBITOR
SWITCH., Diag-
nostic Procedure
for No-diagnostic
Trouble Code
(DTC).>

Go to step 3.

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.
<Ref. to IDI-14,
Combination
Meter Assembly.>

CHECK POWER SWITCH GROUND LINE.
1) Turn ignition switch to OFF.
2) Disconnect connector from power switch.
3) Measure resistance of harness connector

between power switch and chassis ground.

Connector & terminal

(B133) No. 4 — Chassis ground:

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

Ω

Go to step 5.

Repair open circuit
in harness
between power
switch and chassis
ground.

CHECK POWER SWITCH.
1) Power switch turned ON.
2) Measure resistance between terminals of

power switch.

Terminals

No. 3 — No. 4:

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