SUBARU FORESTER 2004 Service Repair Manual

4AT(H4SO)-2
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Basic Diagnostic Procedure
1. Basic Diagnostic Procedure
A: PROCEDURE
Step Check Yes No
1 CHECK PRE-INSPECTION.
1) Ask the customer when and how trouble
occurred using interview checklist. <Ref. to
4AT(H4SO)-4, Check List for Interview.>
2) Before performing the diagnosis, inspect
following items which might influence the AT
problems.
 General inspection <Ref. to 4AT(H4SO)-5,
INSPECTION, General Description.>
 Disconnection of harness connector
 Visually check the damage of harness
 Oil leak
 Stall speed test <Ref. to 4AT-33, Stall Test.>
 Line pressure test <Ref. to 4AT-36, Line
Pressure Test.>
 Transfer clutch pressure test <Ref. to 4AT-
38, Transfer Clutch Pressure Test.>
 Time lag test <Ref. to 4AT-35, Time Lag
Te s t . >
 Road test <Ref. to 4AT-32, Road Test.>
 Inhibitor switch <Ref. to 4AT-51, Inhibitor
Switch.>Is the unit that might influence
AT problem normal?Go to step 2.Repair or replace
each item.
2 CHECK POWER INDICATOR LIGHT.
Turn the ignition switch to ON.Does the POWER indicator
light illuminate?Go to step 4.Go to step 3.
3 CHECK POWER INDICATOR LIGHT.
1) Turn the ignition switch to OFF.
2) Repair the POWER indicator light circuit or
power supply and ground line circuit.
<Ref. to 4AT(H4SO)-25, INSPECTION, Power
Indicator Light Display.>
3) Turn the ignition switch to ON.Is the POWER indicator light
illuminate?Go to step 4.Go to step 5.
4 CHECK INDICATION OF DTC.
Calling up the DTC.
Without Subaru Select Monitor
<Ref. to 4AT(H4SO)-20, WITHOUT SUBARU
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code (DTC).>
With Subaru Select Monitor
<Ref. to 4AT(H4SO)-21, WITH SUBARU
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code (DTC).>
NOTE:
If the communication function of select monitor
cannot be executed normally, check the communi-
cation circuit. <Ref. to 4AT(H4SO)-32, COMMU-
NICATION FOR INITIALIZING IMPOSSIBLE,
Diagnostic Procedure for Subaru Select Monitor
Communication.>Is the DTC displayed? Go to step 6.
NOTE:
Record all DTC.Go to step 5.

4AT(H4SO)-3
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Basic Diagnostic Procedure
5 PERFORM THE GENERAL DIAGNOSTICS.
1) Inspect using “Diagnostic Procedure with-
out DTC”. <Ref. to 4AT(H4SO)-84, Diagnostic
Procedure without Diagnostic Trouble Code
(DTC).>
2) Inspect using “Symptom Related Diagnostic”.
<Ref. to 4AT(H4SO)-110, Symptom Related
Diagnostic.>
3) Perform the clear memory mode.
Without Subaru Select Monitor
<Ref. to 4AT(H4SO)-23, WITHOUT SUBARU
SELECT MONITOR, OPERATION, Clear
Memory Mode.>
With Subaru Select Monitor
<Ref. to 4AT(H4SO)-23, WITH SUBARU
SELECT MONITOR, OPERATION, Clear
Memory Mode.>
4) Perform the inspection mode. <Ref. to
4AT(H4SO)-22, Inspection Mode.>
5) Calling up the DTC.
Without Subaru Select Monitor
<Ref. to 4AT(H4SO)-20, WITHOUT SUBARU
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code (DTC).>
With Subaru Select Monitor
<Ref. to 4AT(H4SO)-21, WITH SUBARU
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code (DTC).>Is the DTC displayed? Go to step 6.Complete the
diagnosis.
6 PERFORM THE DIAGNOSIS.
1) Inspect using “Diagnostics Chart with
DTC”. <Ref. to 4AT(H4SO)-36, Diagnostic Pro-
cedure with Diagnostic Trouble Code (DTC).>
NOTE:
For DTC table, refer to “List of Diagnostic Trou-
ble Code (DTC)”. <Ref. to 4AT(H4SO)-35, List
of Diagnostic Trouble Code (DTC).>
2) Repair the trouble cause.
3) Perform the clear memory mode.
Without Subaru Select Monitor
<Ref. to 4AT(H4SO)-23, WITHOUT SUBARU
SELECT MONITOR, OPERATION, Clear
Memory Mode.>
With Subaru Select Monitor
<Ref. to 4AT(H4SO)-23, WITH SUBARU
SELECT MONITOR, OPERATION, Clear
Memory Mode.>
4) Perform the inspection mode. <Ref. to
4AT(H4SO)-22, Inspection Mode.>
5) Calling up the DTC.
Without Subaru Select Monitor
<Ref. to 4AT(H4SO)-20, WITHOUT SUBARU
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code (DTC).>
With Subaru Select Monitor
<Ref. to 4AT(H4SO)-21, WITH SUBARU
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code (DTC).>Is the DTC displayed? Inspect using “Diag-
nostics Chart with
Diagnostic Connec-
tor”. <Ref. to
4AT(H4SO)-36,
Diagnostic Proce-
dure with Diagnos-
tic Trouble Code
(DTC).>Complete the
diagnosis. Step Check Yes No

4AT(H4SO)-4
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Check List for Interview
2. Check List for Interview
A: CHECK
Check the following items when problem has occurred.
NOTE:
Use copies of this page for interviewing customers.
Customer’s name
Date of purchase
Date of repair
Trans. model TRANSMISSION VIN
Odometer readingkm/h (miles)
Frequency❏ Continuous ❏ Intermittent ( times a day)
Weather❏ Fine ❏ Cloudy ❏ Rainy ❏ Snowy
❏ Others
()
Place❏ High ❏ Suburbs ❏ Inner city ❏ Uphill ❏ Rough road
❏ Others
()
Outdoor temperature❏ Hot ❏ Wa r m ❏ Cool ❏ Cold
Vehicle speedkm/h (MPH)
AT warning light (POWER indicator
light)❏ Continuously lit❏ Not lit
Select lever position❏ P ❏ R ❏ N ❏ D ❏ 3 ❏ 2 ❏ 1
Driving condition❏ Not affected
❏ At racing
❏ While decelerating❏ At starting
❏ While accelerating
❏ While turning (❏ RH/❏
LH)❏ While idling
❏ While cruising
POWER switch❏ ON ❏ OFF
HOLD switch❏ ON ❏ OFF
Symptoms❏ No up-shift
❏ No down-shift
❏ No kick down
❏ Vehicle does not move (❏ Any position ❏ Particular position)
❏ Lock-up malfunction
❏ Noise or vibration
❏ Shift shock or slip
❏ Select lever does not move
❏ Others
()

4AT(H4SO)-5
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
General Description
3. General Description
A: CAUTION
Supplemental Restraint System “Airbag”
The airbag system wiring harness is routed near
the transmission control module (TCM).
CAUTION:
 All airbag system wiring harness and con-
nectors are colored yellow. Do not use an elec-
trical test equipment on these circuit.
 Be careful not to damage the airbag system wir-
ing harness when performing diagnostics and ser-
vicing the TCM.
Measurement
When measuring the voltage and resistance of
ECM, TCM or each sensor, use a tapered pin with
diameter of less than 0.64 mm (0.025 in) in order to
avoid poor contact. Do not insert the pin more than
0.65 mm (0.256 in).
B: INSPECTION
1. BATTERY
Measure the battery voltage and specific gravity of
electrolyte.
Standard voltage: 12 V or more
Specific gravity: Above 1.260
2. TRANSMISSION GROUND
Make sure that the ground terminal bolt is tightened
securely.
Chassis side
Tightening torque:
13 N
⋅m (1.3 kgf-m, 9.4 ft-lb)
3. ATF LEVEL
Make sure that ATF level is in the specification.
<Ref. to 4AT-30, INSPECTION, Automatic Trans-
mission Fluid.>
4. FRONT DIFFERENTIAL OIL LEVEL
Make sure that the front differential oil level is in speci-
fication. <Ref. to 4AT-31, INSPECTION, Differential
Gear Oil.>
AT-00412
(A) Level gauge
(B) “HOT” side
(C) Upper level
(D) Lower level
(E) “COLD” side
(A) Upper level
(B) Lower level
PI-00105
COLD
LFHOT LF
(A)
(C)
(D)
(C)
(D)
(E)
(B)
AT-00317
(A)
(B)
LF

4AT(H4SO)-6
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
General Description
5. OPERATION OF SHIFT SELECT LEVER
Make sure there is no abnormal noise, dragging or
contact pattern in each select lever range.
WARNING:
Stop the engine while checking operation of se-
lect lever.
6. POWER SWITCH
Make sure that the POWER indicator light in com-
bination meter comes ON, when turning the POW-
ER switch to ON.
7. HOLD SWITCH
Make sure that the HOLD indicator light in combi-
nation meter comes ON, when turning the HOLD
switch to ON.
AT-00413
P
R
N
D
3
2
1
AT-00319
AT-00320

4AT(H4SO)-7
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
General Description
C: PREPARATION TOOL
1. SPECIAL TOOL
2. GENERAL TOOL
ILLUSTRATION TOOL NUMBER DESCRIPTION REMARKS
24082AA230
(Newly adopted tool)CARTRIDGE Troubleshooting for electrical systems.
22771AA030 SUBARU SELECT
MONITOR KITTroubleshooting for electrical systems.
 English: 22771AA030 (Without printer)
 German: 22771AA070 (Without printer)
 French: 22771AA080 (Without printer)
 Spanish: 22771AA090 (Without printer)
TOOL NAME REMARKS
Circuit tester Used for measuring resistance, voltage and ampere.
Oscilloscope Used for measuring sensor.
ST24082AA230
ST22771AA030

4AT(H4SO)-8
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Electrical Components Location
4. Electrical Components Location
A: LOCATION
1. CONTROL MODULE
 LHD MODEL
 RHD MODEL
(1) Engine control module (ECM) (3) Transmission control module
(TCM)(4) Data link connector
(2) AT warning light (POWER indica-
tor light)
AT-00414
(1) (2)
(3) (4)
AT-00369 (2)
(4)
(1)
(3)

4AT(H4SO)-9
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Electrical Components Location
LHD RHD
AT-00323
(1)
AT-00324
(2)
(3)
AT-00416
(3)
AT-00372
(4)
AT-00417

4AT(H4SO)-10
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Electrical Components Location
2. SENSOR
(1) Throttle position sensor (4) Rear vehicle speed sensor (6) ATF temperature sensor
(2) Front vehicle speed sensor (5) Torque converter turbine speed
sensor
(3) Inhibitor switch
AT-00744
(1)
(2)(3)
(4) (5)(6)
AT-00328 (1)
(2)
(4)
AT-00329
(3)
AT-00330
(5)
AT-00331

4AT(H4SO)-11
AUTOMATIC TRANSMISSION (DIAGNOSTIC)
Electrical Components Location
3. SOLENOID
(1) Shift solenoid 1 (4) Low clutch timing solenoid (7) 2-4 brake timing solenoid
(2) Shift solenoid 2 (5) Lock-up duty solenoid (8) Transfer duty solenoid
(3) Line pressure duty solenoid (6) 2-4 brake duty solenoid
(6)
AT-00332
AT-00333 (1) (2) (3) (4) (5)(6)(7)
(8)
AT-00334
(1)
(6)
(7) (2)(3)(4)(5)
AT-00335(8)