Subaru Legacy III (2000-2003 year). Manual - part 585

AT-74

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

7

CHECK SHIFT SOLENOID 1 (IN TRANSMIS-
SION).
1) Remove transmission connector from 

bracket.

2) Lift-up or raise the vehicle and support with 

safety stand.

3) Drain automatic transmission fluid.

CAUTION:

Do not drain the automatic transmission flu-
id until it cools down.

4) Remove oil pan, and disconnect connector 

from shift solenoid 1.

5) Measure resistance between shift solenoid 

1 connector and transmission ground.

Terminal

No. 1 — Transmission ground:

Is the measured value within the specified 
range?

10 — 16 

Ω

Go to step 8.

Replace shift sole-
noid 1. <Ref. to 
AT-67, Shift Sole-
noids, Duty Sole-
noids and ATF 
Temperature Sen-
sor.>

8

CHECK HARNESS CONNECTOR BETWEEN 
SHIFT SOLENOID 1 AND TRANSMISSION.
Measure resistance of harness between shift 
solenoid 1 and transmission connector.

Connector & terminal

(AT5) No. 1 — (T4) No. 1:

Is the measured value less than the specified 
value?

1 

Ω

Go to step 9.

Repair open circuit 
in harness 
between shift sole-
noid 1 and trans-
mission connector.

9

CHECK HARNESS CONNECTOR BETWEEN 
SHIFT SOLENOID 1 AND TRANSMISSION.
Measure resistance of harness between shift 
solenoid 1 connector and transmission ground.

Connector & terminal

(T4) No. 1 — Transmission ground:

Does the measured value exceed the specified 
value?

1 M

Ω

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 shift sole-
noid 1 and 
transmission.

Repair short circuit 
harness between 
shift solenoid 1 
and transmission 
connector.

Step

Value

Yes

No

AT-75

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

MEMO:

AT-76

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

J: DTC 72 SHIFT SOLENOID 2

DIAGNOSIS:
Output signal circuit of shift solenoid 2 is open or shorted.
TROUBLE SYMPTOM:
Does not shift.
WIRING DIAGRAM:

AT-00584

5

TRANSMISSION

B54

TCM

AT6

SHIFT

SOLENOID 2

B54

1 2

7

8

9

5 6

3 4

10 11 12
19 20 21

13

14 15

16

17

18

22

23

24

T4

B11

2

B11

1 2

5

6 7

8

13

14 15

16

9 10

11 12

3 4

17 18

19 20

AT-77

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

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

mission.

3) Measure resistance of harness between 

TCM and shift solenoid 2 connector.

Connector & terminal

(B54) No. 5 — (B11) No. 2:

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

1 

Ω

Go to step 2.

Repair open circuit 
in harness 
between TCM and 
transmission con-
nector.

2

CHECK HARNESS CONNECTOR BETWEEN 
TCM AND TRANSMISSION.
Measure resistance of harness between TCM 
connector and transmission ground.

Connector & terminal

(B54) No. 5 — Transmission ground:

Does the measured value exceed the specified 
range?

1 M

Ω

Go to step 3.

Repair short circuit 
in harness 
between TCM and 
transmission con-
nector.

3

CHECK SHIFT SOLENOID 2.
Measure resistance between transmission 
connector terminals.

Connector & terminal

(T4) No. 2 — No. 16:

Is the measured value within the specified 
range?

10 — 16 

Ω

Go to step 4.

Go to step 6.

4

CHECK OUTPUT SIGNAL EMITTED FROM 
TCM.
1) Connect connectors to TCM and transmis-

sion.

2) Lift-up or raise the vehicle and support with 

safety stand.

NOTE:

Raise all wheels off ground.

3) Start the engine and warm-up the transmis-

sion until ATF temperature is above 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.

4) Move selector lever to “D”, and slowly 

increase vehicle speed to 50 km/h (31 
MPH).

NOTE:

The speed difference between front and rear
wheels may light the ABS warning light, but this
indicates no malfunction. When AT control di-
agnosis is finished, perform the ABS memory
clearance procedure of on-board diagnostics
system. <Ref. to ABS-22, Clear Memory
Mode.> or <Ref. to VDC-25, Clear Memory
Mode.>

5) Measure voltage between TCM connector 

and chassis ground.

Connector & terminal

(B54) No. 22 (+) — 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 the TCM 
and transmission.

Go to step 5.