2004 SUBARU FORESTER automatic transmission

4AT(H4DOTC)-29
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure for Subaru Select Monitor Communication
10 CHECK INSTALLATION OF TRANSMISSION
HARNESS CONNECTOR.Is the transmission harness
connector inserted into bulk-
head harness connector?Go to step 11.Connect the bulk-
head harness con-
nector to
transmission har-
ness connector.
11 CHECK POOR CONTACT IN CONNECTORS.Is there poor contact in control
module power supply and data
link connector?Repair the poor
contact.Replace the TCM.
Transmission Con-
trol Module
(TCM).> Step Check Yes No

4AT(H4DOTC)-30
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
12.List of Diagnostic Trouble Code (DTC)
A: LIST
DTC Item Diagnosis content Reference
P0705Transmission Range Sen-
sor Circuit (PRNDL Input)Inhibitor switch malfunction, open or
short circuit TRANSMISSION RANGE SENSOR,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0712Transmission Fluid Temper-
ature Sensor Circuit Low
InputATF temperature sensor malfunction,
open input signal circuit TRANSMISSION FLUID TEMPERA-
TURE SENSOR CIRCUIT LOW INPUT,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0713Transmission Fluid Temper-
ature Sensor Circuit High
InputATF temperature sensor malfunction,
short input signal circuit TRANSMISSION FLUID TEMPERA-
TURE SENSOR CIRCUIT HIGH INPUT,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0715Input/Turbine Speed Sensor
CircuitTorque converter turbine speed sen-
sor malfunction, open or short input
signal circuit INPUT/TURBINE SPEED SENSOR
CIRCUIT, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
P0719Torque Converter/Brake
Switch “B” Circuit Low Brake switch malfunction, open input
signal circuit TORQUE CONVERTER/BRAKE
SWITCH “B” CIRCUIT LOW, Diagnostic
Procedure with Diagnostic Trouble Code
(DTC).>
P0720Output Speed Sensor Cir-
cuitFront vehicle speed sensor malfunc-
tion, open or short input signal circuit OUTPUT SPEED SENSOR CIRCUIT,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0724Torque Converter/Brake
Switch “B” Circuit HighBrake switch malfunction, short input
signal circuit TORQUE CONVERTER/BRAKE
SWITCH “B” CIRCUIT HIGH, Diagnostic
Procedure with Diagnostic Trouble Code
(DTC).>
P0725 Engine Speed Input CircuitOpen or short engine speed output
signal circuit ENGINE SPEED INPUT CIRCUIT, Diag-
nostic Procedure with Diagnostic Trouble
Code (DTC).>
P0731 Gear 1 Incorrect Ratio Vehicle speed sensor, torque con-
verter turbine speed sensor, or con-
trol valve malfunction GEAR 1 INCORRECT RATIO, Diagnos-
tic Procedure with Diagnostic Trouble
Code (DTC).>
P0732 Gear 2 Incorrect Ratio Vehicle speed sensor, torque con-
verter turbine speed sensor, or con-
trol valve malfunction GEAR 2 INCORRECT RATIO, Diagnos-
tic Procedure with Diagnostic Trouble
Code (DTC).>
P0733 Gear 3 Incorrect Ratio Vehicle speed sensor, torque con-
verter turbine speed sensor, or con-
trol valve malfunction GEAR 3 INCORRECT RATIO, Diagnos-
tic Procedure with Diagnostic Trouble
Code (DTC).>
P0734 Gear 4 Incorrect Ratio Vehicle speed sensor, torque con-
verter turbine speed sensor, or con-
trol valve malfunction GEAR 4 INCORRECT RATIO, Diagnos-
tic Procedure with Diagnostic Trouble
Code (DTC).>

4AT(H4DOTC)-31
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
P0736 Reverse Incorrect Ratio Vehicle speed sensor, torque con-
verter turbine speed sensor, or con-
trol valve malfunction REVERSE INCORRECT RATIO, Diag-
nostic Procedure with Diagnostic Trouble
Code (DTC).>
P0741Torque Converter Clutch
Circuit Performance or
Stuck OffLock up clutch malfunction or locking
of valve TORQUE CONVERTER CLUTCH CIR-
CUIT PERFORMANCE OR STUCK
OFF, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P0743Torque Converter Clutch
Circuit Electrical Lock up solenoid malfunction, open
or short output signal circuit TORQUE CONVERTER CLUTCH CIR-
CUIT ELECTRICAL, Diagnostic Proce-
dure with Diagnostic Trouble Code (DTC).>
P0748Pressure Control Solenoid
“A” ElectricalLine pressure linear solenoid malfunc-
tion, open or short output signal circuit PRESSURE CONTROL SOLENOID “A”
ELECTRICAL, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P0753 Shift Solenoid “A” ElectricalLow clutch duty solenoid malfunction,
open or short output signal circuit SHIFT SOLENOID “A” ELECTRICAL,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0758 Shift Solenoid “B” Electrical2-4 brake duty solenoid malfunction,
open or short output signal circuit SHIFT SOLENOID “B” ELECTRICAL,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0763 Shift Solenoid “C” ElectricalHigh clutch duty solenoid malfunction,
open or short output signal circuit SHIFT SOLENOID “C” ELECTRICAL,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0768 Shift Solenoid “D” ElectricalLow & reverse clutch duty solenoid
malfunction, open or short output sig-
nal circuit SHIFT SOLENOID “D” ELECTRICAL,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P0801Reverse Inhibitor Control
CircuitN–R lock solenoid malfunction, open
or short output signal circuit REVERSE INHIBITOR CONTROL CIR-
CUIT, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
P1706AT Vehicle Speed Sensor
Circuit Malfunction (rear
wheel)Rear vehicle speed sensor malfunc-
tion, open or short input signal circuit AT VEHICLE SPEED SENSOR CIR-
CUIT MALFUNCTION (REAR WHEEL),
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
P1707AT AWD Solenoid Valve Cir-
cuit MalfunctionTransfer duty solenoid malfunction,
open or short output signal circuit AT AWD SOLENOID VALVE CIRCUIT
MALFUNCTION, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P1708Throttle Position Sensor
Circuit Low InputAccelerator pedal position sensor or
throttle position sensor malfunction,
open input signal circuit THROTTLE POSITION SENSOR CIR-
CUIT LOW INPUT, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P1709Throttle Position Sensor
Circuit High InputAccelerator pedal position sensor or
throttle position sensor malfunction,
short input signal circuit THROTTLE POSITION SENSOR CIR-
CUIT HIGH INPUT, Diagnostic Procedure
with Diagnostic Trouble Code (DTC).>
P1714Throttle Position Sensor
Power Supply CircuitAccelerator pedal position sensor or
throttle position sensor malfunction,
open or short input signal circuit THROTTLE POSITION SENSOR
POWER SUPPLY CIRCUIT, Diagnostic
Procedure with Diagnostic Trouble Code
(DTC).> DTC Item Diagnosis content Reference

4AT(H4DOTC)-32
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
P1718CAN Communication Cir-
cuitOpen or short AT communication sig-
nal circuit CAN COMMUNICATION CIRCUIT,
Diagnostic Procedure with Diagnostic
Trouble Code (DTC).> DTC Item Diagnosis content Reference

4AT(H4DOTC)-33
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
13.Diagnostic Procedure with Diagnostic Trouble Code (DTC)
A: DTC P0705 TRANSMISSION RANGE SENSOR
DTC DETECTING CONDITION:
 Inhibitor switch with fault.
 Input signal circuit of inhibitor switch is open.
 More than 2 range signal is input.
 “D” range signal is not input when the select lever is shifted from “N” to “3” range.
TROUBLE SYMPTOM:
 Shift characteristics are erroneous.
 Engine brake is not effected when select lever is in “3” range.
 Engine brake is not effected when select lever is in “2” range.
 Engine brake is not effected when select lever is in “1” range.
 Range position of select lever and AT select lever position indicator light on combination meter is not
matched.
WIRING DIAGRAM:
 LHD model
AT-01841
B5B14B22B4A16A4A10A6
32187654
9810311465
E
B38
i3
i10i10
T3
T7 B12
A:
B:B54
TCM
B55
12
14
P
R
N
D
3
2
1
B12
123456789101112
123456789101112131415161718192021222324252627282930
B55
12 7
8956 34
10 11 12
19 20 2113 14 15 16
17 18 22 23 24
B:
INHIBITOR SWITCHCONBINATION
METER
B54
A:
12
7
89 56 34
10 11 1219 20 21
29 30 31 13 14 151617
27 2818
22 23 24 25 26
T7
123456
78910 11 12
B38
1234 56
10 11 12 13 14 15716
23 3019 20
22 26 27 28 29817
24 3118
25921
32

4AT(H4DOTC)-34
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
 RHD model
Step Check Yes No
1 CHECK “P” RANGE SWITCH.
Connect the Subaru Select Monitor to data link
connector, and then change to LED display
screen.When the “P” range is
selected, does LED light up?Go to step 2.Go to step 22.
2 CHECK INDICATOR LIGHT.Does the combination meter
“P” range indicator illuminate?Go to step 3.Go to step 26.
3 CHECK “P” RANGE SWITCH.When the “R” range is selected,
does “P” range LED light up?Go to step 28.Go to step 4.
4 CHECK “R” RANGE SWITCH.When the “R” range is
selected, does LED light up?Go to step 5.Go to step 29.
5 CHECK INDICATOR LIGHT.Does the combination meter
“R” range indicator illuminate?Go to step 6.Go to step 32.
6 CHECK “R” RANGE SWITCH.When the “N” range is selected,
does “R” range LED light up?Go to step 34.Go to step 7.
7 CHECK “N” RANGE SWITCH.When the “N” range is
selected, does LED light up?Go to step 8.Go to step 35.
AT-01842
B5B14B22B4A16A4A10A6
32187654
9810311465
E
B37
i2
i10
B12
T3
T7
A:
B:B54
TCM
B55
6
14
P
R
N
D
3
2
1
B12
123456789101112
i10
123456789101112131415161718192021222324252627282930
1234567812 13 14 15 16 17 1891011
i2
B55
12 7
8956 34
10 11 12
19 20 2113 14 15 16
17 18 22 23 24
B:
INHIBITOR SWITCHCONBINATION
METERA:
B54
123
89
10411 12
13 14 15 1656
7
17
T7
123456
78910 11 12

4AT(H4DOTC)-35
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
8 CHECK INDICATOR LIGHT.Does the combination meter
“N” range indicator illuminate?Go to step 9.Go to step 38.
9 CHECK “N” RANGE SWITCH.When the “D” range is selected,
does “N” range LED light up?Go to step 40.Go to step 10.
10 CHECK “D” RANGE SWITCH.When the “D” range is
selected, does LED light up?Go to step 11.Go to step 41.
11 CHECK INDICATOR LIGHT.Does the combination meter
“D” range indicator illuminate?Go to step 12.Go to step 44.
12 CHECK “D” RANGE SWITCH.When the “3” range is selected,
does “D” range LED light up?Go to step 46.Go to step 13.
13 CHECK “3” RANGE SWITCH.When the “3” range is selected,
does LED light up?Go to step 14.Go to step 47.
14 CHECK INDICATOR LIGHT.Does the combination meter
“3” range indicator illuminate?Go to step 15.Go to step 50.
15 CHECK “3” RANGE SWITCH.When the “2” range is selected,
does “3” range LED light up?Go to step 52.Go to step 16.
16 CHECK “2” RANGE SWITCH.When the “2” range is selected,
does LED light up?Go to step 17.Go to step 53.
17 CHECK INDICATOR LIGHT.Does the combination meter
“2” range indicator illuminate?Go to step 18.Go to step 56.
18 CHECK “2” RANGE SWITCH.When the “1” range is selected,
does “2” range LED light up?Go to step 58.Go to step 19.
19 CHECK “1” RANGE SWITCH.When the “1” range is selected,
does LED light up?Go to step 20.Go to step 59.
20 CHECK INDICATOR LIGHT.Does the combination meter
“1” range indicator illuminate?Go to step 21.Go to step 62.
21 CHECK “1” RANGE SWITCH.When the “2” range is selected,
does “1” range LED light up?Go to step 64.Replace the TCM.
Transmission Con-
trol Module
(TCM).>
22 CHECK HARNESS CONNECTOR BETWEEN
INHIBITOR SWITCH AND CHASSIS
GROUND.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from inhibitor
switch.
3) Measure the resistance of harness
between inhibitor switch and chassis ground.
Connector & terminal
(T7) No. 5 — Chassis ground:Is the resistance less than 1
Ω?Go to step 23.Repair the open
circuit in harness
between inhibitor
switch and chassis
ground, and poor
contact in coupling
connector.
23 CHECK HARNESS CONNECTOR BETWEEN
TCM AND INHIBITOR SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM and
inhibitor switch.
3) Measure the resistance of harness
between TCM and inhibitor switch connector.
Connector & terminal
(B55) No. 5 — (T7) No. 9:Is the resistance less than 1
Ω?Go to step 24.Repair the open cir-
cuit in harness
between TCM and
inhibitor switch con-
nector, and poor
contact in coupling
connector. Step Check Yes No

4AT(H4DOTC)-36
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
24 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
(B55) No. 5 (+) — Chassis ground (–):Is the voltage less than 1 V? Go to step 25.Go to step 65.
25 CHECK INPUT SIGNAL FOR TCM.
1) Shift the select lever except for “P” range.
2) Measure the voltage between TCM and
chassis ground.
Connector & terminal
(B55) No. 5 (+) — Chassis ground (–):Is the voltage more than 8 V? Go to step 65.Replace the TCM.
Transmission Con-
trol Module
(TCM).>
26 CHECK “P” RANGE INDICATOR LIGHT
BULB.
1) Turn the ignition switch to OFF.
2) Remove the combination meter.
3) Remove the “P” range indicator light bulb
from combination meter.Is the “P” range indicator light
bulb OK?Go to step 27.Replace the “P”
range indicator light
bulb. 10, Combination
Meter Assembly.>
27 CHECK HARNESS CONNECTOR BETWEEN
TCM AND COMBINATION METER.
1) Disconnect the connectors from TCM and
combination meter.
2) Measure the resistance of harness
between TCM and combination meter.
Connector & terminal
(B55) No. 5 — (i12) No. 14:Is the resistance more than 1
Ω?Go to step 65.Repair the open cir-
cuit in harness
between TCM con-
nector and combi-
nation meter, and
poor contact in cou-
pling connector.
28 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. 5 — Chassis ground:Is the resistance less than 1
MΩ?Go to step 29.Repair the ground
short circuit in “P”
range circuit.
29 CHECK HARNESS CONNECTOR BETWEEN
TCM AND INHIBITOR SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM and
inhibitor switch.
3) Measure the resistance of harness
between TCM and inhibitor switch connector.
Connector & terminal
(B55) No. 14 — (T7) No. 8:Is the resistance less than 1
Ω?Go to step 30.Repair the open cir-
cuit in harness
between TCM and
inhibitor switch con-
nector, and poor
contact in coupling
connector.
30 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
(B55) No. 14 (+) — Chassis ground (–):Is the voltage less than 1 V? Go to step 31.Go to step 65. Step Check Yes No