Subaru Legacy 2003 Service Manual page 2392

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn ignition switch to OFF.
2) Disconnect connector from TCM and trans-
mission.
3) Measure resistance of harness between
TCM and transmission connector.
Connector & terminal
(B55) No. 24 — (B11) No. 19:
Is the measured value less than the speci-
fied value?
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure resistance of harness between TCM
and transmission connector.
Connector & terminal
(B54) No. 19 — (B11) No. 20:
Is the measured value less than the specified
value?
3 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure resistance of harness between TCM
and chassis ground.
Connector & terminal
(B55) No. 24 — Chassis ground:
Does the measured value exceed the specified
value?
4 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure resistance of harness between TCM
and chassis ground.
Connector & terminal
(B54) No. 19 — Chassis ground:
Does the measured value exceed the specified
value?
5 CHECK REAR VEHICLE SPEED SENSOR.
Measure resistance between transmission
connector receptacle's terminals.
Connector & terminal
(T4) No. 19 — No. 20:
Is the measured value within the specified
range?
6 PREPARE OSCILLOSCOPE.
Do you have oscilloscope?
7 PREPARE SUBARU SELECT MONITOR.
Do you have a Subaru Select Monitor?
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Value
1 Ω
1 Ω
1 MΩ
1 MΩ
450 — 650 Ω
Oscilloscope is available.
Subaru Select Monitor is avail-
able.
AT-117
Yes
Go to step 2. Repair open circuit
in harness
between TCM and
transmission con-
nector.
Go to step 3. Repair open circuit
in harness
between TCM and
transmission, and
poor contact in
coupling connec-
tor.
Go to step 4. Repair short circuit
in harness
between TCM and
transmission con-
nector.
Go to step 5. Repair short circuit
in harness
between TCM and
transmission con-
nector.
Go to step 6. Replace rear vehi-
cle speed sensor.
<Ref. to AT-58,
Rear Vehicle
Speed Sensor.>
Go to step 10. Go to step 7.
Go to step 9. Go to step 8.
No