Subaru Legacy IV (2008 year). Manual - part 750

5AT(diag)-15

Transmission Control Module (TCM) I/O Signal

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

H & LR/C solenoid 
output

B54

5

While driving at 2nd of 
manual mode

5 V or more

3 — 9 

:

(ATF temperature 
20°C (68°F))

Drive frequency: 
300 Hz

While driving at 1st, 
3rd-5th of manual 
mode

Less than 1.5 V

Power GND

B54

13

Always

Approx. 0 V

 — 

 

Analog GND

B54

18

Always

Approx. 0 V

 — 

 

Fr/B solenoid output

B54

4

While driving at other 
than 4th of manual 
mode

5 V or more

3 — 9 

:

(ATF temperature 
20°C (68°F))

Drive frequency: 
300 Hz

While driving at 4th of 
manual mode

Less than 1.5 V

L/U solenoid output

B54

7

When lock-up

3 V or more

3 — 9 

:

(ATF temperature 
20°C (68°F))

Drive frequency: 
300 Hz

When not lock-up

Less than 1 V

D/C solenoid output

B54

1

While driving at 1st or 
5th of manual mode

5 V or more

3 — 9 

:

(ATF temperature 
20°C (68°F))

Drive frequency: 
300 Hz

While driving at 2nd-4th 
of manual mode

Less than 1.5 V

D/C oil pressure 
switch input

B54

22

While driving at 1st or 
5th of manual mode

6 V or more

While driving at 2nd-4th 
of manual mode

Less than 1.5 V

Subaru Select 
Monitor 
communication line

B55

8

Ignition switch ON

8 V or more

 — 

Ignition switch OFF

Less than 1 V

Sensor GND 
(analog)

B54

16

Always

Approx. 0 V

 — 

H&LR/C oil pressure 
switch input

B54

14

While driving at 2nd of 
manual mode

6 V or more

 — 

While driving at 3rd-5th 
of manual mode

Less than 1.5 V

Fwd/B solenoid 
output

B54

19

While driving at 1st or 
2nd of manual mode

5 V or more

Drive frequency: 
300 Hz

While driving at 3rd-5th 
of manual mode

Less than 1.5 V

Fwd/B oil pressure 
switch input

B54

21

While driving at 1st or 
2nd of manual mode

Less than 1.5 V

While driving at 3rd-5th 
of manual mode

6 V or more

Front vehicle speed 
sensor input

B54

24

While driving at 2nd 
and 20 km/h (12 MPH) 
of manual mode

Approx. 500 — 700 rpm

 — 

Use the Subaru 
Select Monitor.

While driving at 4th and 
80 km/h (50 MPH) of 
manual mode

Approx. 
2,000 — 2,500 rpm

Use the Subaru 
Select Monitor.

Inhibitor switch 1 
input

B54

8

Ignition switch ON, 
“P” range

Less than 0.5 V

 — 

Ignition switch ON, 
“N” range

5 V or more

Item

Connector 

No.

Terminal 

No.

Measuring condition

Measured value

Resistance 

between terminal 

and chassis 

ground

Remarks

5AT(diag)-16

Transmission Control Module (TCM) I/O Signal

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Inhibitor switch 2 
input

B54

9

Ignition switch ON, 
“P” range

5 V or more

 — 

Ignition switch ON, 
“D” range

Less than 0.5 V

Lateral G sensor 
signal

B55

9

Ignition switch ON

2.0 — 3.0

 — 

Ignition power 
supply

B54

27

Ignition switch ON

8 V or more

 — 

Ignition switch OFF

Less than 1 V

Rear vehicle speed 
sensor input

B54

23

While driving at 2nd 
and 20 km/h (12 MPH) 
of manual mode

Approx. 500 — 700 rpm

 — 

Use the Subaru 
Select Monitor.

While driving at 4th and 
80 km/h (50 MPH) of 
manual mode

Approx. 
2,000 — 2,500 rpm

Use the Subaru 
Select Monitor.

Fr/B oil pressure 
switch input

B54

15

While driving at other 
than 4th of manual 
mode

Less than 1.5 V

 — 

While driving at 4th of 
manual mode

6 V or more

Turbine speed 
sensor 1 input

B54

26

2nd of manual mode, 
turbine speed sensor is 
2,000 rpm (Read from 
Subaru Select Monitor)

Approx. 0 rpm

 — 

Use the Subaru 
Select Monitor.

4th of manual mode, 
turbine speed sensor is 
2,000 rpm (Read from 
Subaru Select Monitor)

Approx. 
1,900 — 2,100 rpm

Use the Subaru 
Select Monitor.

Lateral G sensor 
power supply output

B55

7

Ignition switch ON 
(when lateral G sensor 
is in horizontal position)

4.75 — 5.25

 — 

Inhibitor switch 3 
input

B54

10

Ignition switch ON, 
“R” range

5 V or more

 — 

Ignition switch ON, 
“D” range

Less than 0.5 V

Control GND1

B55

23

Ignition switch ON

Approx. 0 V

Ignition switch OFF

 

 

Control GND2

B55

22

Ignition switch ON

Approx. 0 V

Ignition switch OFF

 

 

Inhibitor switch 4 
input

B54

11

Ignition switch ON, 
“P” range

Less than 0.5 V

 — 

Ignition switch ON, 
“D” range

5 V or more

Back-up light relay 
output

B55

13

Ignition switch ON, 
“R” range

Less than 1 V

90 — 110 

:

(ATF temperature 
25°C (77°F))

Ignition switch ON, 
other than “R” range

8 V or more

AWD solenoid 
output

B54

2

Engine ON, “P” range 
or “N” range, 
accelerator OFF

Less than 1 V

3 — 9 

:

(ATF temperature 
20°C (68°F))

Drive frequency: 
300 Hz

Engine ON, “D” range, 
accelerator OFF, 
brake ON

2 V or more

Item

Connector 

No.

Terminal 

No.

Measuring condition

Measured value

Resistance 

between terminal 

and chassis 

ground

Remarks

5AT(diag)-17

Transmission Control Module (TCM) I/O Signal

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Turbine speed 
sensor 2 input

B54

25

2nd of manual mode, 
turbine speed sensor is 
2,000 rpm (Read from 
Subaru Select Monitor)

Approx. 
1,200 — 1,500 rpm

 — 

Use the Subaru 
Select Monitor.

4th of manual mode, 
turbine speed sensor is 
2,000 rpm (Read from 
Subaru Select Monitor)

Approx. 
1,900 — 2,100 rpm

 — 

Use the Subaru 
Select Monitor.

PN signal output

B55

11

Ignition switch ON, 
Other than “P” range or 
“N” range

8 V or more

 — 

Ignition switch ON, 
“P” range or “N” range

Less than 1 V

 — 

Ignition power 
supply 1

B55

26

Ignition switch ON

8 V or more

Ignition switch OFF

 

 

Ignition power 
supply 2

B55

19

Ignition switch ON

8 V or more

 

 

Ignition switch OFF

Less than 1 V

 

 

Ignition power 
supply 3

B55

18

Ignition switch ON

8 V or more

 

 

Ignition switch OFF

Less than 1 V

 

 

Ignition power 
supply 4

B55

25

Ignition switch ON

8 V or more

Ignition switch OFF

 

 

Item

Connector 

No.

Terminal 

No.

Measuring condition

Measured value

Resistance 

between terminal 

and chassis 

ground

Remarks

5AT(diag)-18

Subaru Select Monitor

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

6. Subaru Select Monitor

A: OPERATION

1. READ DIAGNOSTIC TROUBLE CODE 
(DTC)

1) Prepare the Subaru Select Monitor kit. <Ref. to
5AT(diag)-7, PREPARATION TOOL, General De-
scription.>
2) Prepare PC with Subaru Select Monitor in-
stalled.
3) Connect the USB cable between SDI (Subaru
Diagnosis Interface) and USB port on the personal
computer (dedicated port for the Subaru Select
Monitor).

NOTE:
The dedicated port for the Subaru Select Monitor
means the USB port which was used to install the
Subaru Select Monitor.
4) Connect the diagnosis cable to SDI.
5) Connect SDI to data link connector located in the
lower portion of the instrument panel (on the driv-
er’s side).

CAUTION:
Do not connect scan tools other than the Suba-
ru Select Monitor.
6) Start the PC.
7) Turn the ignition switch to ON (engine OFF) and
run the “PC application for Subaru Select Monitor”.
8) On the «Main Menu» display, select the {Each
System Check}.
9) On the «System Selection Menu» display, select
the {Transmission Control System}.
10) After transmission type information pops up,
select [OK].
11) On the «Transmission Diagnosis» display, se-
lect the {Diagnostic Code(s) Display}.
12) On the «Diagnostic Code(s) Display» display,
select the {Temporary Diagnostic Code(s)} or
{Memorized Diagnostic Code(s)}

2. READ CURRENT DATA

1) On the «Main Menu» display, select the {Each
System Check}.
2) On the «System Selection Menu» display, select
the {Transmission Control System}.
3) After transmission type information pops up, se-
lect [OK].
4) On the «Transmission Diagnosis» display, se-
lect the {Current Data Display & Save}.
5) On the «Current Data Display & Save» display,
select the {Normal sampling}.

AT-04371