2004 SUBARU FORESTER automatic transmission

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. 4AT(H4SO)-4, Check List for Interview.>
2) Before performing the diagnosis, inspect
following items which might influence the AT
problems.
 General inspection INSPECTION, General Description.>
 Disconnection of harness connector
 Visually check the damage of harness
 Oil leak
 Stall speed test
 Line pressure test Pressure Test.>
 Transfer clutch pressure test 38, Transfer Clutch Pressure Test.>
 Time lag test Te s t . >
 Road test
 Inhibitor switch 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.
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
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code (DTC).>
With Subaru Select Monitor
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. 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”. Procedure without Diagnostic Trouble Code
(DTC).>
2) Inspect using “Symptom Related Diagnostic”.
Diagnostic.>
3) Perform the clear memory mode.
Without Subaru Select Monitor
SELECT MONITOR, OPERATION, Clear
Memory Mode.>
With Subaru Select Monitor
SELECT MONITOR, OPERATION, Clear
Memory Mode.>
4) Perform the inspection mode. 4AT(H4SO)-22, Inspection Mode.>
5) Calling up the DTC.
Without Subaru Select Monitor
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code (DTC).>
With Subaru Select Monitor
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”. cedure with Diagnostic Trouble Code (DTC).>
NOTE:
For DTC table, refer to “List of Diagnostic Trou-
ble Code (DTC)”. of Diagnostic Trouble Code (DTC).>
2) Repair the trouble cause.
3) Perform the clear memory mode.
Without Subaru Select Monitor
SELECT MONITOR, OPERATION, Clear
Memory Mode.>
With Subaru Select Monitor
SELECT MONITOR, OPERATION, Clear
Memory Mode.>
4) Perform the inspection mode. 4AT(H4SO)-22, Inspection Mode.>
5) Calling up the DTC.
Without Subaru Select Monitor
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code (DTC).>
With Subaru Select Monitor
SELECT MONITOR, OPERATION, Read
Diagnostic Trouble Code (DTC).>Is the DTC displayed? Inspect using “Diag-
nostics Chart with
Diagnostic Connec-
tor”. 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.
mission Fluid.>
4. FRONT DIFFERENTIAL OIL LEVEL
Make sure that the front differential oil level is in speci-
fication. 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