Subaru Legacy IV (2008 year). Service manual — part 702
4AT(diag)-29
Diagnostic Procedure for Subaru Select Monitor Communication
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
17
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.
18
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.
19
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.
20
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
No
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
Vehicle sensor, torque converter tur-
bine speed sensor or control valve
malfunction
<Ref. to 4AT(diag)-54, DTC P0731 GEAR 1
INCORRECT RATIO, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0732
Gear 2 Incorrect
Ratio
Vehicle sensor, torque converter tur-
bine speed sensor or control valve
malfunction
<Ref. to 4AT(diag)-54, DTC P0732 GEAR 2
INCORRECT RATIO, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0733
Gear 3 Incorrect
Ratio
Vehicle sensor, torque converter tur-
bine speed sensor or control valve
malfunction
<Ref. to 4AT(diag)-54, DTC P0733 GEAR 3
INCORRECT RATIO, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0734
Gear 4 Incorrect
Ratio
Vehicle sensor, torque converter tur-
bine speed sensor or control valve
malfunction
<Ref. to 4AT(diag)-54, DTC P0734 GEAR 4
INCORRECT RATIO, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0736
Reverse Incorrect
Ratio
Vehicle sensor, torque converter tur-
bine speed sensor or control valve
malfunction
<Ref. to 4AT(diag)-55, DTC P0736 REVERSE
INCORRECT RATIO, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0741
Torque Converter
Clutch Circuit
Performance or
Stuck Off
Lock-up clutch is faulty or valve is
stuck.
<Ref. to 4AT(diag)-56, DTC P0741 TORQUE CON-
VERTER CLUTCH CIRCUIT PERFORMANCE OR
STUCK OFF, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0743
Torque Converter
Clutch Circuit
Electrical
Lock-up solenoid is faulty or output
signal circuit is open or shorted.
<Ref. to 4AT(diag)-57, DTC P0743 TORQUE CON-
VERTER CLUTCH CIRCUIT ELECTRICAL, Diag-
nostic Procedure with Diagnostic Trouble Code
(DTC).>
P0748
Pressure Control
Solenoid “A”
Electrical
Line pressure linear solenoid is faulty
or output signal circuit is open or
shorted.
<Ref. to 4AT(diag)-60, DTC P0748 PRESSURE
CONTROL SOLENOID “A” ELECTRICAL, Diag-
nostic Procedure with Diagnostic Trouble Code
(DTC).>
4AT(diag)-31
List of Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
P0753
Shift Solenoid “A”
Electrical
Low clutch duty solenoid is faulty or
output signal circuit is open or
shorted.
<Ref. to 4AT(diag)-62, DTC P0753 SHIFT SOLE-
NOID “A” ELECTRICAL, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0758
Shift Solenoid “B”
Electrical
2-4 brake duty solenoid is faulty or
output signal circuit is open or
shorted.
<Ref. to 4AT(diag)-65, DTC P0758 SHIFT SOLE-
NOID “B” ELECTRICAL, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0763
Shift Solenoid “C”
Electrical
High clutch duty solenoid is faulty or
output signal circuit is open or
shorted.
<Ref. to 4AT(diag)-68, DTC P0763 SHIFT SOLE-
NOID “C” ELECTRICAL, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0768
Shift Solenoid “D”
Electrical
Low & reverse clutch duty solenoid is
faulty or output signal circuit is open
or shorted.
<Ref. to 4AT(diag)-71, DTC P0768 SHIFT SOLE-
NOID “D” ELECTRICAL, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0801
Reverse Inhibit
Control Circuit
Shift lock solenoid is faulty or output
signal circuit is open or shorted.
<Ref. to 4AT(diag)-74, DTC P0801 REVERSE
INHIBIT CONTROL CIRCUIT, Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>
P1706
AT Vehicle Speed
Sensor Circuit
Malfunction (Rear
Wheel)
Rear vehicle speed sensor is faulty or
input signal circuit is open or shorted.
<Ref. to 4AT(diag)-76, DTC P1706 AT VEHICLE
SPEED SENSOR CIRCUIT MALFUNCTION
(REAR WHEEL), Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1707
AT AWD Solenoid
Valve Circuit
Malfunction
Transfer duty solenoid is faulty or out-
put signal circuit is open or shorted.
<Ref. to 4AT(diag)-78, DTC P1707 AT AWD SOLE-
NOID VALVE CIRCUIT MALFUNCTION, Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>
P1718
CAN Communication
Circuit
CAN communication circuit is open
or shorted.
<Ref. to 4AT(diag)-80, DTC P1718 CAN COMMU-
NICATION CIRCUIT, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P1817
SPORT Mode Switch
Circuit
SPORT shift switch is faulty or input
signal circuit is open or shorted.
<Ref. to 4AT(diag)-81, DTC P1817 SPORT MODE
SWITCH CIRCUIT, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
DTC
Item
Contents of diagnosis
Reference
4AT(diag)-32
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
13.Diagnostic Procedure with Diagnostic Trouble Code (DTC)
A: DTC P0705 TRANSMISSION RANGE SENSOR CIRCUIT (PRNDL INPUT)
DTC DETECTING CONDITION:
• Inhibitor switch is faulty.
• At least 2 range signal is input.
TROUBLE SYMPTOM:
• Shift characteristics are erroneous.
• The range position of the select lever and the AT select lever position indicator light on the combination
meter do not match.
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