Subaru Legacy 2002 Service Manual page 1812

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
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:
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:
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:
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:
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
operating temperature.
5) Disconnect connector from transmission.
6) Measure resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 11 — No. 12:
6 CHECK ATF TEMPERATURE SENSOR.
1) Turn ignition switch to ON (engine OFF).
2) Measure resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 11 — No. 12:
7 PREPARE SUBARU SELECT MONITOR.
Step
Is the resistance less than
1 Ω?
Is the resistance less than
1 Ω?
Is the resistance more than
1 MΩ?
Is the resistance more than
1 MΩ?
Is the resistance between
275 and 375 Ω?
Does the resistance value
increase while the ATF
temperature decreases?
Do you have a Subaru
Select Monitor?
AT-43
Automatic Transmission (Diagnostics)
Check Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
Go to step 7.
Go to step 9.
No
Repair open cir-
cuit in harness
between TCM and
transmission con-
nector.
Repair open cir-
cuit in harness
between TCM and
transmission con-
nector.
Repair short cir-
cuit in harness
between TCM and
transmission con-
nector.
Repair short cir-
cuit in harness
between TCM and
transmission con-
nector.
Go to step 11.
Go to step 11.
Go to step 8.