Subaru LEGACY 2006 Manual page 3432

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
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 shorted or open.
TROUBLE SYMPTOM:
Driving performance is poor.
WIRING DIAGRAM:
VEHICLE SPEED
Step
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 the harness
between TCM connector and transmission
connector.
Connector & terminal
(B54) No. 6 — (B11) No. 14:
B54 TCM
* JOINT
CONNECTOR
B53
*
*
: TEMINAL No. OPTIONAL ARRANGEMENT
AMONG 1, 11 AND 12
B11
T4
FRONT
SENSOR
Is the resistance less than 1
Ω?
4AT(diag)-46
5
13
17
1 2
8 9
17 18
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
Check Yes
Go to step 2.
B11
1 2 3 4
6 7 8
9 10 11 12
14 15 16
20
18 19
B54
3 4 5 6 7
10 11 12 13 14 15 16
19 20 21 22 23 24
B53
AT-03409
No
Repair the open
circuit of harness
between TCM and
transmission con-
nector.