
5AT-56
Transmission Control Module (TCM)
AUTOMATIC TRANSMISSION
19.Transmission Control Mod-
ule (TCM)
A: REMOVAL
1) Disconnect the ground cable from battery.
2) Remove the lower cover and then disconnect
the connector.
3) Disconnect the connector from TCM.
4) Remove the relay from TCM body.
5) Remove the TCM.
B: INSTALLATION
1) Install the relay to TCM body.
2) Install the TCM.
Tightening torque:
7.5 N·m (0.76 kgf-m, 5.5 ft-lb)
3) Connect the connector to the TCM.
4) Install in the reverse order of removal.
5) Perform Clear Memory 2 operation.
TION, Subaru Select Monitor.>
6) Perform the inspection with driving the vehicle at
the end of repair work, and make sure there is no
faulty as below;
•Excessive shift shock
•Oil leakage from the transmission body, etc.
•Occurrence of noise caused by interference etc.
NOTE:
If excessive shift shock is felt, execute advance op-
eration of learning control.
(A) Transmission control module (TCM)
(B) Steering column
(A) Transmission control module (TCM)
(B) Steering column
AT-03258(A)
(B)
AT-03258(A)
(B)

5AT(diag)-5
General Description
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
3. General Description
A: CAUTION
•SRS AIRBAG SYSTEM
The airbag system wiring harness is routed near
the TCM.
CAUTION:
•All air bag system wiring harnesses and con-
nectors are colored yellow. Do not use an elec-
tric test equipment to check these circuits.
•Be careful not to damage the airbag system
wiring harness when performing diagnostics or
servicing the TCM.
•MEASUREMENT
When measuring the voltage and resistance of the
ECM, TCM or each sensor, use a tapered pin with
a diameter of less than 0.64 mm (0.025 in) in order
to avoid poor contact. Do not insert a pin of more
than 0.65 mm (0.026 in) diameter.
B: INSPECTION
1. BATTERY
Measure the battery voltage and specific gravity of
electrolyte.
Standard voltage: 12 V or more
Specific gravity: 1.260 or more
2. TRANSMISSION GROUND
Make sure that the ground terminal bolt is tightened
securely.
Tightening torque:
13 N·m (1.3 kgf-m, 9.4 ft-lb)
3. ATF LEVEL
Make sure that ATF level is the specified amount.
4. FRONT DIFFERENTIAL OIL LEVEL
Make sure the front differential oil level is the spec-
ified amount.
AT-03293
(A) Level gauge
(B) Inspection position when “HOT”
(C) Upper level
(D) Lower level
(E) Inspection position when “COLD”
(A) Upper level
(B) Lower level
AT-03276
COLDLF
HOTLF
(C)
(D)
(C)
(D)
(E)
(B)
(A)
AT-00317
(A)(B)L
F

5AT(diag)-11
Transmission Control Module (TCM) I/O Signal
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
5. Transmission Control Module (TCM) I/O Signal
A: ELECTRICAL SPECIFICATION
NOTE:
The measurement should be performed after warming up.
ItemConnector
No.
Te r m i n a l
No.Measuring condition Measured value
Resistance
between termi-
nal and chassis
ground
Remarks
P/L solenoid output B54 9
Engine ON, “P” range,
accelerator OFF, brake
ON
Approx. 4.0 —
6.0 V3 — 9 Ω (ATF
temperature
20°C (68°F))
Driving fre-
quency 750 —
850 HzManual mode 1st, accel-
erator OFF, brake ON
Approx. 2.0 —
4.0 V
PVIGN power supply B54
8Ignition switch ONPow er s up p ly
voltage—
7Ignition switch ONPow er s up p ly
voltage—
I/C oil pressure switch
inputB54 6 — — —
The condition
of I/C oil pres-
sure switch
cannot be read
by the tester.
Pow er G N D B 5 4 5 A lways A pp r ox . 0 V —
CAN communication
line (+)B54 4 — — —
CAN communication
line (–)B54 3 — — —
AT F t e m p e r a t u r e s e n -
sor 1 inputB54 2 Ignition switch ON
2.5 — 2.9 V
(ATF tempera-
ture 20°C
(68°F))
0.8 — 1.0 V
(ATF tempera-
ture 80°C
(176°F))
4.0 — 5.0 kΩ
(ATF tempera-
ture 20°C
(68°F))
0.7 — 0.9 kΩ
(ATF tempera-
ture 80°C
(176°F))
Battery power supply B54 1 AlwaysPow er s up p ly
voltage—
AT-01451
12341011 121920 21135614 1578916 17 1822 23 24
12789563410 11 1219 20 2113 14 15 16 17 18222324
B55B54

5AT(diag)-16
Subaru Select Monitor
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
•A list of the support data is shown in the following table.
NOTE:
For details concerning operation procedure, refer to the “SUBARU SELECT MONITOR OPERATION MAN-
UAL”.
Item Display Unit of measure
Engine speed signal Engine speed rpm
Battery voltage Battery Voltage V
Accelerator pedal position sensor Acceleration opening angle %
Fr o nt veh ic l e sp e ed se n so r s ig n al Fr o n t W h ee l S p e ed km/ h
Gear position Gear Position —
Tu r b i n e s p e e d s e n s o r s i g n a l Tu r b i n e R e v o l u t i o n S p e e d r p m
Rear vehicle speed sensor signal Rear Wheel Speed km/h
ATF temperature sensor 1 signal ATF Temp. °C
ATF temperature sensor 2 signal ATF Temp. 2 °C
Tu r b i n e s p e e d s e n s o r 1 s i g n a l Tu r b i n e R e v o l u t i o n S p e e d 1 r p m
Tu r b i n e s p e e d s e n s o r 2 s i g n a l Tu r b i n e R e v o l u t i o n S p e e d 2 r p m
High & low reverse clutch solenoid indicator current H&LR/C Solenoid Current A
Direct clutch solenoid indicator current D/C Solenoid Current A
Fr o nt b rake so l en oi d in di c at o r c u rr e n t F / B S o l en o id Cur r e nt A
Input clutch solenoid indicator current I/C Solenoid Current A
Line pressure solenoid indicator current P/L Solenoid Current A
Lock-up solenoid indicator current L/U Solenoid Current A
Tr a n s f e r s o l e n o i d i n d i c a t o r c u r r e n t A W D S o l e n o i d C u r r e n t A
High & low reverse clutch solenoid target oil pressure H&LR/C Solenoid Target Pressure kPa
Direct clutch solenoid target oil pressure D/C Solenoid Target Pressure kPa
Fr o nt b rake so l en oi d ta r g et o il pr e ss ur e F / B S o l en o id Ta r g et P r es su r e kPa
Input clutch solenoid target oil pressure I/C Solenoid Target Pressure kPa
Line pressure solenoid target oil pressure P/L Solenoid Target Pressure kPa
Lock-up solenoid target oil pressure L/U Solenoid Target Pressure kPa
Tr a n s f e r s o l e n o i d t a r g e t o i l p r e s s u r e A W D S o l e n o i d Ta r g e t P r e s s u r e k P a
Ignition switch Ignition SW ON Input or OFF Input
Tip signal Tip Mode SW ON or OFF
Cruise control ON signal Cruise Control Signal ON or OFF
Tip down shift signal Down SW ON or OFF
Stop light switch signal Stop Light SW ON or OFF
Tip up shift signal Up SW ON or OFF
Drive range signal D Range ON or OFF
Reverse range signal R Range ON or OFF
Diagnosis light output signal Diagnosis Lamp ON or OFF
AT F t e m p e r a t u r e l a m p s i g n a l AT F Te m p e r a t u r e L a m p O N o r O F F
Shift lock solenoid signal Shift Lock Solenoid ON or OFF
Par king range signal P range ON or OFF
P/N range output signal P/N Signal ON or OFF
Neutral range signal N range ON or OFF
Inhibitor switch 1 input signal Inhibitor SW1 High or Low
Inhibitor switch 2 input signal Inhibitor SW2 High or Low
Inhibitor switch 3 input signal Inhibitor SW3 High or Low
Inhibitor switch 4 input signal Inhibitor SW4 High or Low
Inhibitor switch 3 monitor input signal Inhibitor SW3 Monitor High or Low
Backup light relay output signal Back-up light relay ON or OFF
High & low reverse clutch oil pressure switch input signal H&LR/C Oil Pressure SW ON or OFF
Direct clutch oil pressure switch input signal D/C Oil Pressure SW ON or OFF
Fr o nt b rake oi l pr e ss ur e swi tc h i n pu t si gn a l Fr / B Oi l P r e ss ur e S W ON or OF F
Input clutch oil pressure switch input signal I/C Oil Pressure SW ON or OFF
Low coast brake oil pressure switch input signal LC/B Oil Pressure SW ON or OFF
Low coast brake solenoid input signal LC B Solenoid ON or OFF

5AT(diag)-23
SPORT Indicator Light Display
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
B: INSPECTION
DIAGNOSIS:
SPORT indicator light circuit is open or shorted.
TROUBLE SYMPTOM:
When the ignition switch is turned to ON (engine OFF), SPORT indicator light does not illuminate.
WIRING DIAGRAM:
AT-03284
34
2930
COMBINATIONMETER
i10
i84A:B280B:
A27A26
B20B30
43
TCMB54
BODY INTEGRATED UNIT
SPORT
BATTERY
MAIN SBF SBF-6
IGNITIONSWITCH
NO.5
E
i84
8765432122232120191615141312111093435333217301831292827262524
A:
B280
87654321
2223212019161514131211109173018292827262524
B:
B54
12789563410 11 1219 20 2113 14 15 16 17 18222324
i10
123456789101112131415161718192021222324252627282930

5AT(diag)-25
Diagnostic Procedure for Subaru Select Monitor Communication
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
12.Diagnostic Procedure for Subaru Select Monitor Communication
A: COMMUNICATION FOR INITIALIZING IMPOSSIBLE
DIAGNOSIS:
Defective harness connector
TROUBLE SYMPTOM:
Subaru Select Monitor communication failure
WIRING DIAGRAM:
AT-03285
B21
12345678910111213 14 15 16
B54A:
12789563410 11 1219 20 2113 14 15 16 17 18222324
B55B:
12341011 121920 21135614 1578916 17 1822 23 24
IGNITIONSWITCH
P-VIGNRELAY
BATTERY
DATA LINKCONNECTOR
TRANSMISSION
B54A:B55
B357
B: TCM
B402
E
NO.5
NO.32SBF-6 MAIN SBF
A1
A19B21
B1B10A20
A5A14
1
12
10
13
NO.13
B21
E216
E
EE
A7A8A10
32
41
B402
123 8910413 14 15 165671112
B357
34
12

5AT(diag)-26
Diagnostic Procedure for Subaru Select Monitor Communication
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step Check Yes No
1CHECK SUBARU SELECT MONITOR POW-
ER SUPPLY CIRCUIT.
Measure the voltage between data link con-
nector and chassis ground.
Connector & terminal
(B402) No. 1 (+) — Chassis ground (–):
Is the voltage more than 10 V? Go to step 2.Repair the har-
ness connector
between battery
and data link con-
nector, and poor
contact of connec-
tor.
2CHECK SUBARU SELECT MONITOR
GROUND CIRCUIT.
Measure the resistance of harness between
data link connector and chassis ground.
Connector & terminal
(B402) No. 12 — Chassis ground:
(B402) No. 13 — Chassis ground:
Is the resistance less than 1
Ω?
Go to step 3.Repair the open
circuit of harness
between data link
connector and
ground terminal,
and poor contact
of connector.
3CHECK COMMUNICATION OF SUBARU SE-
LECT MONITOR.
1) Turn the ignition switch to ON.
2) Using the Subaru Select Monitor, check
whether communication to transmission sys-
tem can be executed normally.
Are the name and year of sys-
tem displayed on Subaru
Select Monitor?
Go to step 8.Go to step 4.
4CHECK COMMUNICATION OF SUBARU SE-
LECT MONITOR.
1) Turn the ignition switch to OFF.
2) Disconnect the TCM connector.
3) Turn the ignition switch to ON.
4) Check whether communication to engine
system can be executed normally.
Are the name and year of sys-
tem displayed on Subaru
Select Monitor?
Go to step 6.Go to step 5.
5CHECK COMMUNICATION OF SUBARU SE-
LECT MONITOR.
1) Turn the ignition switch to OFF.
2) Connect the TCM connector.
3) Disconnect the connector from ECM.
4) Turn the ignition switch to ON.
5) Check whether communication to transmis-
sion system can be executed normally.
Are the name and year of sys-
tem displayed on Subaru
Select Monitor?
Inspect the ECM. Go to step 6.
6CHECK HARNESS CONNECTOR BETWEEN
EACH CONTROL MODULE AND DATA LINK
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the TCM and ECM connector.
3) Measure the resistance between TCM con-
nector and chassis ground.
Connector & terminal
(B402) No. 10 — Chassis ground:
Is the resistance more than 1
MΩ?
Go to step 7.Check harness
and connector
between each con-
trol module and
data link connec-
tor.
7CHECK OUTPUT SIGNAL OF TCM.
1) Turn the ignition switch to ON.
2) Measure the voltage between TCM and
chassis ground.
Connector & terminal
(B402) No. 10 (+) — Chassis ground (–):
Is the voltage more than 1 V? Check harness
and connector
between each con-
trol module and
data link connec-
tor.
Go to step 8.
8CHECK HARNESS CONNECTOR BETWEEN
TCM AND DATA LINK CONNECTOR.
Measure the resistance between TCM connec-
tor and data link connector.
Connector & terminal
(B54) No. 20 — (B402) No. 10:
Is the resistance less than 1
Ω?
Go to step 9.Repair the har-
ness and connec-
tor between TCM
and data link con-
nector.
9CHECK INSTALLATION OF TCM CONNEC-
TOR.
Tu r n t h e i g n i t i o n s w i t c h t o O F F.
Is TCM connector connected
to TCM?
Go to step 10.Connect the TCM
connector to TCM.

5AT(diag)-32
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
WIRING DIAGRAM:
AT-03286
i10
123456789101112131415161718192021222324252627282930
34
2930
COMBINATIONMETER
RANGE POSITION/GEAR POSITIONINDICATOR
i10
BODY INTEGRATED UNIT
i84A:
B280B:
A27A26
B20B30
C4C3
D3D13D20D4D14
31428
TRANSMISSION
TCMB54C:B55D:
B12
T3
BATTERY
MAIN SBF SBF-6 NO.5
E
E
i84
8765432122232120191615141312111093435333217301831292827262524
A:
B280
87654321
2223212019161514131211109173018292827262524
B:
B54
12789563410 11 1219 20 2113 14 15 16 17 18222324
C:
123410 11 1219 20 21135614 1578916 17 1822 23 24
B55D:
B12
12345678
123 68910 11 12 13 14451516
T5
7
53642T5
Step Check Yes No
1CHECK DTC OF TCM.Is DTC of AT CAN communica-
tion circuit displayed?
Pe r for m t h e d ia g -
nosis according to
DTC.
Go to step 2.