Subaru Legacy (2005 year). Service manual — part 562

4AT(diag)-85

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

6

CHECK INPUT SIGNAL FOR TCM.
1) Connect the connectors to TCM and trans-
mission.
2) Lift-up the vehicle and support with rigid
racks.

NOTE:

Raise all wheels off floor.

3) Start the engine and set vehicle in 20 km/h
(12 MPH) condition.

NOTE:

The speed difference between front and rear
wheels may light the ABS warning light or VDC
warning light, but this indicates no malfunction.
When AT control diagnosis is finished, perform
the ABS memory clearance procedure or VDC
memory clearance procedure of on-board diag-
nostics system. <Ref. to ABS(diag)-26, Clear
Memory Mode.> <Ref. to VDC(diag)-25, Clear
Memory Mode.>

4) Measure the AC voltage between TCM
connector terminals.

Connector & terminal

(B54) No. 24 (+) — No. 23 (

−

):

Is the voltage approx. 2 V or
more?

Go to step 7.

Replace the rear
vehicle speed sen-
sor.

7

CHECK POOR CONTACT.

Is there poor contact in rear
vehicle speed sensor circuit?

Repair the poor
contact.

Replace the TCM.
<Ref. to 4AT-66,
Transmission Con-
trol Module
(TCM).>

Step

Check

Yes

No

4AT(diag)-86

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

W: DTC P1707 AT AWD SOLENOID VALVE CIRCUIT MALFUNCTION

DTC DETECTING CONDITION:
Output signal circuit of transfer duty solenoid is open or shorted.
TROUBLE SYMPTOM:
• Tight corner braking phenomenon is occurred.
• Front wheel slips on the slippery road.
WIRING DIAGRAM:

Step

Check

Yes

No

1

CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM and
transmission.
3) Measure the resistance of harness
between TCM and transmission connector.

Connector & terminal

(B55) No. 4 — (B11) No. 8:

Is the resistance less than 1
Ω?

Go to step 2.

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

2

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

Connector & terminal

(B55) No. 4 — Chassis ground:

Is the resistance more than 1
M

Ω?

Go to step 3.

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

3

CHECK TRANSFER DUTY SOLENOID.
Measure the resistance between transmission
connector and transmission terminals.

Connector & terminal

(T4) No. 8 — No. 20:

Is the resistance 2.0 — 6.0

Ω? Go to step 4.

Go to step 7.

AT-01493

B11

B55

AT3

1

2

3 4

5

6 7

8

9

13

14 15

20

19

17

16

10

11 12

18

4

B55

B11

AT3

T4

TCM

8

5

1

2

7

8

9

5

6

3

4

10 11 12

19 20 21

29 30 31

13 14 15 16 17

27 28

18

22 23 24 25 26

1

3

4 5 6

2

TRANSMISSION

TRANSFER
DUTY
SOLENOID

4AT(diag)-87

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

4

CHECK OUTPUT SIGNAL EMITTED FROM
TCM USING SUBARU SELECT MONITOR.
1) Connect the connectors to TCM and trans-
mission.
2) Connect the Subaru Select Monitor to data
link connector.
3) Turn the ignition switch to ON (engine
OFF), and turn the Subaru Select Monitor
power switch to ON.
4) Shift the select lever to the “N” range, and
fully close the throttle pedal. (Vehicle speed is
0 km/h (0 MPH))
5) Read the data of transfer duty solenoid
using Subaru Select Monitor.
• Transfer duty solenoid is indicated in “%”.

Is the measured value approx.
5%?

Go to step 5.

Go to step 6.

5

CHECK OUTPUT SIGNAL EMITTED FROM
TCM USING SUBARU SELECT MONITOR.
1) Shift the select lever to “D” range.
2) Read the data of transfer duty solenoid
using Subaru Select Monitor.
• Transfer duty solenoid is indicated in “%”.

Is the measured value 18 —
35%?

Even if the SPORT
indicator light is
blinking, the cir-
cuit has returned
to normal condi-
tion at this time. A
temporary poor
contact of connec-
tor or harness may
be the cause.
Repair the har-
ness or connector
in TCM and trans-
mission.

Go to step 6.

6

CHECK POOR CONTACT.

Is there poor contact in transfer
duty solenoid circuit?

Repair the poor
contact.

Replace the TCM.
<Ref. to 4AT-66,
Transmission Con-
trol Module
(TCM).>

7

CHECK TRANSFER DUTY SOLENOID (IN
TRANSMISSION).
1) Lift-up the vehicle and support with rigid
racks.

NOTE:

Raise all wheels off floor.

2) Drain the ATF.

CAUTION:

Do not drain ATF until it cools down.

3) Remove the extension case, and discon-
nect the connector from transfer duty solenoid.
4) Measure the resistance between transfer
duty solenoid connector and transmission
ground.

Connector & terminal

(AT3) No. 5 — Transmission ground:

Is the resistance 2.0 — 6.0

Ω? Go to step 8.

Replace the con-
trol valve body.
<Ref. to 4AT-62,
Control Valve
Body.>

8

CHECK HARNESS CONNECTOR BETWEEN
TRANSFER DUTY SOLENOID AND TRANS-
MISSION.
Measure the resistance of harness between
transfer duty solenoid and transmission con-
nector.

Connector & terminal

(T4) No. 8 — (AT3) No. 5:

Is the resistance less than 1
Ω?

Go to step 9.

Repair the open
circuit of harness
between transfer
duty solenoid and
transmission con-
nector.

Step

Check

Yes

No

4AT(diag)-88

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

9

CHECK HARNESS CONNECTOR BETWEEN
TRANSFER DUTY SOLENOID AND TRANS-
MISSION.
Measure the resistance of harness between
transmission connector and transmission
ground.

Connector & terminal

(T4) No. 8 — Transmission ground:

Is the resistance more than 1
M

Ω?

Even if the SPORT
indicator light is
blinking, the cir-
cuit has returned
to normal condi-
tion at this time. A
temporary poor
contact of connec-
tor or harness may
be the cause.
Repair the har-
ness or poor con-
tact in the transfer
duty solenoid and
transmission.

Repair the short
circuit of harness
between transfer
duty solenoid and
transmission con-
nector.

Step

Check

Yes

No