Subaru 2003 LEGACY Service Manual page 51

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ATF TEMPERATURE SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from transmission
and TCM.
3) Measure resistance of harness between
TCM and transmission connector.
Connector & terminal
(B54) No. 20 — (B11) No. 12:
Is the measured value less than the speci-
fied value?
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ATF TEMPERATURE SENSOR.
Measure resistance of harness between TCM
and transmission connector.
Connector & terminal
(B54) No. 11 — (B11) No. 11:
Is the measured value less than the specified
value?
3 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ATF TEMPERATURE SENSOR.
Measure resistance of harness between TCM
connector and chassis ground.
Connector & terminal
(B54) No. 20 — Chassis ground:
Does the measured value exceed the specified
value?
4 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ATF TEMPERATURE SENSOR.
Measure resistance of harness between TCM
connector and chassis ground.
Connector & terminal
(B54) No. 11 — Chassis ground:
Does the measured value exceed the specified
value?
5 CHECK ATF TEMPERATURE SENSOR.
1) Turn ignition switch to OFF.
2) Connect connectors to transmission and
TCM.
3) Turn ignition switch to ON and start engine.
4) Warm-up the transmission until ATF tem-
perature reaches to 80°C (176°F).
NOTE:
If ambient temperature is below 0°C (32°F),
drive the vehicle until the ATF reaches its oper-
ating temperature.
5) Disconnect connector from transmission.
6) Measure resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 11 — No. 12:
Is the measured value within the specified
range?
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Value
1 Ω
1 Ω
1 MΩ
1 MΩ
275 — 375 Ω
AT-49
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 con-
nector.
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 with ATF
sensor.
No