Subaru Legacy 2005 Service Manual page 2250

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
T: DTC P0768 SHIFT SOLENOID "D" ELECTRICAL
DTC DETECTING CONDITION:
The output signal circuit of low & reverse duty solenoid is open or shorted.
TROUBLE SYMPTOM:
Gear is not changed.
WIRING DIAGRAM:
B11
3 4
1 2
5 6 7 8
9 10 11 12
14 15
13 16
17 18 19 20
Step
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from transmis-
sion and TCM.
3) Measure the resistance of harness
between TCM and transmission connector.
Connector & terminal
(B55) No. 7 — (B11) No. 6:
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND CHASSIS GROUND.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B55) No. 7 — Chassis ground:
3 CHECK LOW & REVERSE DUTY SOLENOID.
Measure the resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 6 — No. 20:
B55
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20 21
22 23 24 25 26 27 28 29 30 31
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the resistance 2.0 — 6.0 Ω? Go to step 4.
4AT(diag)-78
B55
TCM
B11
T4
AT3
LOW & REVERSE
DUTY
SOLENOID
TRANSMISSION
AT3
1 2 3
4 5 6
Check
Go to step 2.
Go to step 3.
AT-01490
Yes No
Repair the open
circuit of harness
between TCM and
transmission con-
nector.
Repair the short
circuit of harness
between TCM and
transmission con-
nector.
Go to step 7.