Subaru Legacy 2003 Service Manual page 2325

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
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:
Does the resistance value increase while
the ATF temperature decreases?
7 PREPARE SUBARU SELECT MONITOR.
Do you have a Subaru Select Monitor?
8 CHECK INPUT SIGNAL FOR TCM.
1) Connect connector to transmission.
2) Warm-up the transmission until ATF tem-
perature is about 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.
3) Measure voltage between TCM connector
terminal.
Connector & terminal
(B54) No. 11 (+) — No. 20 ( − − − − ):
Is the measured value within the specified
range?
9 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Connect connector to transmission.
2) Turn ignition switch to ON (engine OFF).
Does the ATF temperature gradually
decrease?
10 CHECK POOR CONTACT.
Is there poor contact in ATF temperature sen-
sor circuit?
Step Value
Resistance value increases.
Subaru Select Monitor is avail-
able.
0.4 — 0.9 V
ATF temperature gradually
increases.
There is poor contact.
AT-50
Yes
Go to step 7. Replace ATF sen-
sor.
Go to step 9. Go to step 8.
Even if "POWER" Go to step 10.
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. Tempo-
rary poor contact
of the connector or
harness may be
the case. Repair
harness or con-
tact in the ATF
temperature sen-
sor and transmis-
sion connector.
Even if "POWER" Go to step 10.
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. Tempo-
rary poor contact
of the connector or
harness may be
the case. Repair
harness or con-
tact in the ATF
temperature sen-
sor and transmis-
sion connector.
Repair poor con- Replace TCM.
tact. <Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
No