Subaru Legacy IV (2008 year). Service manual — part 702

4AT(diag)-29

Diagnostic Procedure for Subaru Select Monitor Communication

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

CHECK FUSE (NO. 12).
Remove the fuse (F/B No. 12).

Is the fuse (No. 12) blown out? Replace the fuse

(No. 12). If the
replaced fuse (No.
12) has blown out
easily, repair short
circuit of harness
between fuse (No.
12) and TCM.

Repair the open
circuit of harness
between fuse (No.
12) and TCM, or
fuse (No. 12) and
battery, and poor
contact of the con-
nector.

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. 20 — (B11) No. 20:
(B55) No. 21 — (B11) No. 20:
(B55) No. 22 — (B11) No. 19:
(B55) No. 23 — (B11) No. 19:

Is the resistance less than 1

:? Go to step 19.

Repair the open
circuit of harness
between TCM and
transmission har-
ness connector,
and poor contact of
connector.

CHECK HARNESS CONNECTOR BETWEEN
TRANSMISSION AND TRANSMISSION
GROUND.
Measure the resistance of the harness between
transmission and transmission ground.

Connector & terminal

(T4) No. 19 — Transmission ground:
(T4) No. 20 — Transmission ground:

Is the resistance less than 1

:? Go to step 20.

Repair the open
circuit of the har-
ness between
transmission and
transmission
ground.

CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in TCM

power supply, ground and data
link connector?

Repair the connec-
tor.

Replace the TCM.
<Ref. to 4AT-61,
Transmission Con-
trol Module
(TCM).>

Step

Check

Yes

4AT(diag)-30

List of Diagnostic Trouble Code (DTC)

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

12.List of Diagnostic Trouble Code (DTC)

A: LIST

DTC

Item

Contents of diagnosis

Reference

P0705

Transmission Range
Sensor Circuit
(PRNDL Input)

Inhibitor switch malfunction or short
circuit

<Ref. to 4AT(diag)-32, DTC P0705 TRANSMIS-
SION RANGE SENSOR CIRCUIT (PRNDL
INPUT), Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>

P0712

Transmission Fluid
Temperature Sensor
Circuit Low Input

ATF temperature sensor is faulty or
input signal circuit is open.

<Ref. to 4AT(diag)-39, DTC P0712 TRANSMIS-
SION FLUID TEMPERATURE SENSOR CIRCUIT
LOW INPUT, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>

P0713

Transmission Fluid
Temperature Sensor
Circuit High Input

ATF temperature sensor is faulty or
input signal circuit is shorted.

<Ref. to 4AT(diag)-42, DTC P0713 TRANSMIS-
SION FLUID TEMPERATURE SENSOR CIRCUIT
HIGH INPUT, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>

P0715

Input/Turbine Speed
Sensor Circuit

Torque converter turbine speed sen-
sor malfunction, open or shorted
input signal circuit

<Ref. to 4AT(diag)-44, DTC P0715 INPUT/TUR-
BINE SPEED SENSOR CIRCUIT, Diagnostic Pro-
cedure with Diagnostic Trouble Code (DTC).>

P0719

Brake Switch Circuit
Low

Brake switch malfunction, open input
signal circuit

<Ref. to 4AT(diag)-46, DTC P0719 BRAKE
SWITCH CIRCUIT LOW, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>

P0720

Output Speed Sensor
Circuit

Front vehicle speed sensor malfunc-
tion, open or shorted input signal cir-
cuit

<Ref. to 4AT(diag)-49, DTC P0720 OUTPUT
SPEED SENSOR CIRCUIT, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>

P0724

Brake Switch Circuit
High

Brake switch malfunction, shorted
input signal circuit

<Ref. to 4AT(diag)-51, DTC P0724 BRAKE
SWITCH CIRCUIT HIGH, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>

P0725

Engine Speed Input
Circuit

Open or shorted engine speed out-
put signal circuit

<Ref. to 4AT(diag)-53, DTC P0725 ENGINE
SPEED INPUT CIRCUIT, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>

P0731

Gear 1 Incorrect
Ratio