Subaru Legacy III (2000-2003 year). Service manual — part 582

AT-62

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

10

CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Connect all connectors.
2) Connect Subaru Select Monitor to data link

connector.

3) Lift-up or raise the vehicle and place safety

stands.

NOTE:

Raise all wheels off floor.

4) Turn ignition switch to ON and turn Subaru

Select Monitor switch to ON.

5) Start the engine.
6) Read data of vehicle speed using Subaru

Select Monitor.

•Compare speedometer with Subaru Select
Monitor indications.
•Vehicle speed is indicated in “km/h” or “MPH”.
7) Slowly increase vehicle speed to 60 km/h

or 37 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.>

Does the speedometer indication increase
as the Subaru Select Monitor data
increases?

Subaru Select Monitor display
also increases.

Even if “POWER”
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. A tempo-
rary poor connec-
tor or harness may
be the case.
Repair harness or
connector in the
front vehicle speed
sensor circuit.

Go to step 11.

11

CHECK POOR CONTACT.
Is there poor contact in front vehicle speed
sensor circuit?

There is poor contact.

Repair poor con-
tact.

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

Step

Value

Yes

No

AT-63

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

MEMO:

AT-64

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

F: DTC 36 TORQUE CONVERTER TURBINE SPEED SENSOR

DIAGNOSIS:
Input signal circuit of TCM is open or shorted.
TROUBLE SYMPTOM:
Excessive shift shock.
WIRING DIAGRAM:

AT-00780

14

15

8

9

B11

B53

T4

TCM

B55

NT

TB

1
2

3

SENSOR

TORQUE

SHIELD
JOINT CONNECTOR

CONVERTER

TURBINE SPEED

B55

B11

1 2

5

6 7

8

13

14 15

16

9 10

11 12

3 4

17 18

19 20

1 2 3 4

10 11 12
19 20 21

13

5 6

14 15

7

8

9

16

17

18

22

23

24

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

B53

1 2 3 4 5 6

: TB

B53

: NT

4
5

6

: NON-TURBO MODEL

NT

: TURBO MODEL

TB

AT-65

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)

Step

Value

Yes

No

1

CHECK TORQUE CONVERTER TURBINE
SPEED SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from transmission.
3) Measure resistance between transmission

connector receptacle's terminals.

Connector & terminal

(T4) No. 14 — No. 15:

Is the measured value within the specified
range?

450 — 650

Ω

Go to step 2.

Replace turbine
speed sensor.
<Ref. to AT-59,
Torque Converter
Turbine Speed
Sensor.>

2

CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Disconnect connector from TCM.
2) Measure resistance of harness between

TCM and transmission connector.

Connector & terminal

(B55) No. 8 — (B11) No. 14:

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

1

Ω

Go to step 3.

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

3

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

Connector & terminal

(B55) No. 9 — (B11) No. 15:

Is the measured value less than the specified
value?

1

Ω

Go to step 4.

Repair open circuit
in harness
between TCM and
transmission con-
nector, and poor
contact in cou-
pling connector.

4

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

Connector & terminal

(B55) No. 9 — Chassis ground:

Does the measured value exceed the specified
value?

1 M

Ω

Go to step 5.

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

5

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

Connector & terminal

(B55) No. 8 — Chassis ground:

Does the measured value exceed the specified
value?

1 M

Ω

Go to step 6.

Repair short circuit
in harness
between TCM and
transmission con-
nector, and poor
contact in cou-
pling connector.

6

PREPARE OSCILLOSCOPE.
Do you have oscilloscope?

Oscilloscope is available.

Go to step 10.

Go to step 7.

7

PREPARE SUBARU SELECT MONITOR.
Do you have a Subaru Select Monitor?

Subaru Select Monitor is avail-
able.

Go to step 9.

Go to step 8.