Subaru Legacy (2005 year). 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