Subaru Legacy (2005 year). Service manual — part 554
4AT(diag)-53
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
F: DTC P0720 OUTPUT SPEED SENSOR CIRCUIT
DTC DETECTING CONDITION:
• The vehicle speed signal is abnormal.
• The harness connector between TCM and vehicle speed sensor is in short or open.
TROUBLE SYMPTOM:
• The neutralizing control does not operate.
• The slip lock up control does not operate.
• Poor driving performance.
WIRING DIAGRAM:
AT-03160
LH RH
LH
RH
18
14
B11
T4
6
B11
1
2
3 4
5
6 7
8
9
13
14 15
20
19
17
16
10
11 12
18
TCM
B54
FRONT
VEHICLE SPEED
SENSOR
B54
1 2
7
8 9
5
6
3
4
10 11 12
19 20 21
13 14 15 16
17 18
22 23 24
B53
15
B53
JOINT
CONNECTOR
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
: LHD MODEL
LH
RH : RHD MODEL
*
: TERMINAL No. RANDOM ARRANGEMENT
AMONG 1,11, AND 12
* *
*
*
*
*
4AT(diag)-54
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
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
(B54) No. 6 — (B11) No. 14:
Is the resistance less than 1
Ω?
Repair the open
circuit of harness
between TCM and
transmission con-
nector.
2
CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of harness between
TCM and transmission connector.
Connector & terminal
(B54) No. 15 — (B11) No. 18:
Is the resistance less than 1
Ω?
Repair the open
circuit of harness
between TCM and
transmission con-
nector, and poor
contact in connec-
tor.
3
CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of harness between
TCM and transmission connector.
Connector & terminal
(B54) No. 6 — Chassis ground:
Is the resistance more than 1
M
Ω?
Repair the short
circuit of harness
between TCM and
transmission con-
nector.
4
CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of harness between
TCM and transmission connector.
Connector & terminal
(B54) No. 15 — Chassis ground:
Is the resistance more than 1
M
Ω?
Repair the short
circuit of harness
between TCM and
transmission con-
nector, and poor
contact in connec-
tor.
5
CHECK FRONT VEHICLE SPEED SENSOR.
Measure the resistance between transmission
connector receptacle’s terminals.
Connector & terminal
(T4) No. 14 — No. 18:
Is the resistance 450 — 650
Ω?
Replace the front
vehicle speed sen-
sor. <Ref. to 4AT-
55, Front Vehicle
Speed Sensor.>
4AT(diag)-55
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
6
CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Connect all the connectors.
2) Connect the Subaru Select Monitor to data
link connector.
3) Lift-up the vehicle.
NOTE:
Raise all wheels off floor.
4) Turn the ignition switch to ON and the Sub-
aru Select Monitor power switch to ON.
5) Start the engine.
6) Read the data of vehicle speed using Sub-
aru Select Monitor.
• Compare the speedometer with Subaru
Select Monitor indications.
• Vehicle speed is indicated in “km/h” or
“MPH”.
7) Slowly increase the vehicle speed to 60 km/
h (37 MPH).
NOTE:
The speed difference between front and rear
wheels may light the ABS warning light or VDC
warning light, but this indicates no malfunction.
When AT control diagnosis is finished, perform
the ABS memory clearance procedure or VDC
memory clearance procedure of on-board diag-
nostics system. <Ref. to ABS(diag)-26, Clear
Memory Mode.> <Ref. to VDC(diag)-25, Clear
Memory Mode.>
Does the speedometer indica-
tion increase as the front wheel
vehicle speed data of Subaru
Select Monitor increases?
Even if the SPORT
indicator light is
blinking, the cir-
cuit has returned
to normal condi-
tion at this time. A
temporary poor
contact of connec-
tor or harness may
be the cause.
Repair the har-
ness in the front
vehicle speed sen-
sor circuit.
7
CHECK POOR CONTACT.
Is there poor contact in front
vehicle speed sensor circuit?
Repair the poor
contact.
Replace the TCM.
<Ref. to 4AT-66,
Transmission Con-
trol Module
(TCM).>
Step
Check
Yes
No
4AT(diag)-56
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
G: DTC P0724 TORQUE CONVERTER/BRAKE SWITCH “B” CIRCUIT HIGH
DTC DETECTING CONDITION:
Brake switch malfunction, open input signal circuit
TROUBLE SYMPTOM:
• Gear is not shifted down when driving a down hill.
• The neutralizing control does not operate.
WIRING DIAGRAM:
• LHD model
AT-03158
B159
2
1
3 4
8 9
7
6
5
B280
8
7
6
5
4
3
2
1
22
23
21
20
19
16
15
14
13
12
11
10
9
17
30
18
29
28
27
26
25
24
B281
8
7
6
5
4
3
2
1
21
22
20
19
16
15
14
13
12
11
10
9
17 18
28
27
26
25
24
23
B64
2
1
B54
8
3
4
5
6
7
2
1
18 19 20
17
16
15
14
13
12
11
10
9
24
23
22
21
C:
B:
B159
B280
B:
B281
C:
C23
B20
B30
3
5
9
MAIN SBF
SBF-2
No.8
E
B
A
TTER
Y
STOP LIGHT
SWITCH
JOINT
CONNECTOR
BODY INTEGRATED
MODULE
3
12
TCM
B54
2
4
5
7
B352
JOINT
CONNECTOR
B355
JOINT
CONNECTOR
2
WC
WC
1
OC
2
OC
: WITHOUT CRUISE CONTROL
: WITH CRUISE CONTROL
OC
WC
OC
WC
:
:
B64
B65
1
2
3
4
B65
1 2 3 4
5 6 7 8
B54
B355
B352
OC
WC
:
:
1
*
: TERMINAL No. RANDOM ARRANGEMENT
AMONG 1,2,5, AND 6
2
*
: TERMINAL No. RANDOM ARRANGEMENT
AMONG 3,4,7, AND 8
2
*
2
*
1
*
1
*
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