Subaru Legacy (2005 year). Manual — part 550

4AT(diag)-37

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

13

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

Connector & terminal

(B54) No. 5 — (T7) No. 9:

Is the resistance less than 1
Ω?

Go to step 14.

Repair the open
circuit of harness
between TCM and
inhibitor switch
connector, and
poor contact in
coupling connec-
tor.

14

CHECK INPUT SIGNAL FOR TCM.
1) Turn the ignition switch to OFF.
2) Connect the connector to TCM and inhibitor
switch.
3) Turn the ignition switch to ON.
4) Shift the select lever to “P” range.
5) Measure the voltage between TCM and
chassis ground.

Connector & terminal

(B54) No. 5 (+) — Chassis ground (

−

):

Is the voltage less than 1 V?

Go to step 15.

Go to step 41.

15

CHECK INPUT SIGNAL FOR TCM.
1) Shift the select lever to any range other
than “P”.
2) Measure the voltage between TCM and
chassis ground.

Connector & terminal

(B54) No. 5 (+) — Chassis ground (

−

):

Is the voltage more than 8 V?

Go to step 16.

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

16

CHECK BODY INTEGRATED MODULE.
Read the data of inhibitor switch from Subaru
Select Monitor. <Ref. to LAN(diag)-14, OPER-
ATION, Subaru Select Monitor.>

Is 7 displayed?

Go to step 17.

Check the body
integrated module.

17

CHECK BODY INTEGRATED MODULE.
Check DTC of body integrated module.

Is DTC of CAN communication
displayed?

Perform the diag-
nosis according to
DTC.

Go to step 18.

18

CHECK COMBINATION METER.
Check the “P” range indicator light. <Ref. to
IDI-3, INSPECTION, Combination Meter Sys-
tem.>

Is the “P” range indicator light
OK?

Go to step 41.

Replace the com-
bination meter
assembly. <Ref. to
IDI-15, Combina-
tion Meter.>

19

CHECK HARNESS CONNECTOR BETWEEN
TCM AND INHIBITOR SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM,
inhibitor switch and combination meter.
3) Measure the resistance of harness
between TCM connector and chassis ground.

Connector & terminal

(B54) No. 5 — Chassis ground:

Is the resistance more than 1
M

Ω?

Go to step 42.

Repair the ground
short circuit in “P”
range circuit.

20

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

Connector & terminal

(B54) No. 14 — (T7) No. 8:

Is the resistance less than 1
Ω?

Go to step 21.

Repair the open
circuit of harness
between TCM and
inhibitor switch
connector, and
poor contact in
coupling connec-
tor.

Step

Check

Yes

No

4AT(diag)-38

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

21

CHECK INPUT SIGNAL FOR TCM.
1) Turn the ignition switch to OFF.
2) Connect the connector to TCM and inhibitor
switch.
3) Turn the ignition switch to ON.
4) Shift the select lever to “R” range.
5) Measure the voltage between TCM and
chassis ground.

Connector & terminal

(B54) No. 14 (+) — Chassis ground (

−

):

Is the voltage less than 1 V?

Go to step 22.

Go to step 41.

22

CHECK INPUT SIGNAL FOR TCM.
1) Shift the select lever to other than “R”
range.
2) Measure the voltage between TCM and
chassis ground.

Connector & terminal

(B54) No. 14 (+) — Chassis ground (

−

):

Is the voltage more than 8 V?

Go to step 41.

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

23

CHECK BODY INTEGRATED MODULE.
Read the data of shift position from Subaru
Select Monitor. <Ref. to LAN(diag)-14, OPER-
ATION, Subaru Select Monitor.>

Is 6 displayed?

Go to step 24.

Check the body
integrated module.

24

CHECK BODY INTEGRATED MODULE.
Check DTC of body integrated module.

Is DTC of CAN communication
displayed?

Perform the diag-
nosis according to
DTC.

Go to step 25.

25

CHECK COMBINATION METER.
Check the “R” range indicator light. <Ref. to
IDI-3, INSPECTION, Combination Meter Sys-
tem.>

Is the “R” range indicator light
OK?

Go to step 41.

Replace the com-
bination meter
assembly. <Ref. to
IDI-15, Combina-
tion Meter.>

26

CHECK HARNESS CONNECTOR BETWEEN
TCM AND INHIBITOR SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM,
inhibitor switch and combination meter.
3) Measure the resistance of harness
between TCM connector and chassis ground.

Connector & terminal

(B54) No. 14 — Chassis ground:

Is the resistance more than 1
M

Ω?

Go to step 41.

Repair the ground
short circuit in “R”
range circuit.

27

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

Connector & terminal

(B54) No. 22 — (T7) No. 10:

Is the resistance less than 1
Ω?

Go to step 28.

Repair the open
circuit of harness
between TCM and
inhibitor switch
connector, and
poor contact in
coupling connec-
tor.

28

CHECK INPUT SIGNAL FOR TCM.
1) Turn the ignition switch to OFF.
2) Connect the connector to TCM and inhibitor
switch.
3) Turn the ignition switch to ON.
4) Shift the select lever to “N” range.
5) Measure the voltage between TCM and
chassis ground.

Connector & terminal

(B54) No. 22 (+) — Chassis ground (

−

):

Is the voltage less than 1 V?

Go to step 29.

Go to step 41.

Step

Check

Yes

No

4AT(diag)-39

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

29

CHECK INPUT SIGNAL FOR TCM.
1) Shift the select lever to other than “N”
range.
2) Measure the voltage between TCM and
chassis ground.

Connector & terminal

(B54) No. 22 (+) — Chassis ground (

−

):

Is the voltage more than 8 V?

Go to step 41.

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

30

CHECK BODY INTEGRATED MODULE.
Read the data of shift position from the Subaru
Select Monitor. <Ref. to LAN(diag)-14, OPER-
ATION, Subaru Select Monitor.>

Is 5 displayed?

Go to step 31.

Check the body
integrated module.

31

CHECK BODY INTEGRATED MODULE.
Check DTC of body integrated module.

Is DTC of CAN communication
displayed?

Perform the diag-
nosis according to
DTC.

Go to step 32.

32

CHECK COMBINATION METER.
Check the “N” range indicator light. <Ref. to
IDI-3, INSPECTION, Combination Meter Sys-
tem.>

Is the “N” range indicator light
OK?

Go to step 41.

Replace the com-
bination meter
assembly. <Ref. to
IDI-15, Combina-
tion Meter.>

33

CHECK HARNESS CONNECTOR BETWEEN
TCM AND INHIBITOR SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM,
inhibitor switch and combination meter.
3) Measure the resistance of harness
between TCM connector and chassis ground.

Connector & terminal

(B54) No. 22 — Chassis ground:

Is the resistance more than 1
M

Ω?

Go to step 41.

Repair the ground
short circuit in “N”
range circuit.

34

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

Connector & terminal

(B54) No. 4 — (T7) No. 3:

Is the resistance less than 1
Ω?

Go to step 35.

Repair the open
circuit of harness
between TCM and
inhibitor switch
connector, and
poor contact in
coupling connec-
tor.

35

CHECK INPUT SIGNAL FOR TCM.
1) Turn the ignition switch to OFF.
2) Connect the connector to TCM and inhibitor
switch.
3) Turn the ignition switch to ON.
4) Shift the select lever to “D” range.
5) Measure the voltage between TCM and
chassis ground.

Connector & terminal

(B54) No. 4 (+) — Chassis ground (

−

):

Is the voltage less than 1 V?

Go to step 36.

Go to step 41.

36

CHECK INPUT SIGNAL FOR TCM.
1) Shift the select lever to other than “D”
range.
2) Measure the voltage between TCM and
chassis ground.

Connector & terminal

(B54) No. 4 (+) — Chassis ground (

−

):

Is the voltage more than 8 V?

Go to step 41.

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

37

CHECK BODY INTEGRATED MODULE.
Read the data of inhibitor switch from Subaru
Select Monitor. <Ref. to LAN(diag)-14, OPER-
ATION, Subaru Select Monitor.>

Is 4 displayed?

Go to step 38.

Check the body
integrated module.

Step

Check

Yes

No

4AT(diag)-40

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

38

CHECK BODY INTEGRATED MODULE.
Check DTC of body integrated module.

Is DTC of CAN communication
displayed?

Perform the diag-
nosis according to
DTC.

Go to step 39.

39

CHECK COMBINATION METER.
Check the “D” range indicator light. <Ref. to
IDI-3, INSPECTION, Combination Meter Sys-
tem.>

Is the “D” range indicator light
OK?

Go to step 41.

Replace the com-
bination meter
assembly. <Ref. to
IDI-15, Combina-
tion Meter.>

40

CHECK HARNESS CONNECTOR BETWEEN
TCM AND INHIBITOR SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM,
inhibitor switch and combination meter.
3) Measure the resistance of harness
between TCM connector and chassis ground.

Connector & terminal

(B55) No. 4 — Chassis ground:

Is the resistance more than 1
M

Ω?

Go to step 41.

Repair the ground
short circuit in “D”
range circuit.

41

CHECK POOR CONTACT.

Is there poor contact in inhibi-
tor switch circuit?

Repair the poor
contact.

Go to step 42.

42

CHECK INHIBITOR SWITCH.

Is the inhibitor switch in normal
position?

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

Adjust inhibitor
switch and select
cable. <Ref. to
4AT-51, Inhibitor
Switch.> <Ref. to
CS-27, Select
Cable.>

Step

Check

Yes

No