Subaru Legacy III (2000-2003 year). Manual - part 579
AT-50
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
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?
Resistance value increases.
Replace ATF sen-
sor.
7
PREPARE SUBARU SELECT MONITOR.
Do you have a Subaru Select Monitor?
Subaru Select Monitor is avail-
able.
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?
0.4 — 0.9 V
Even if “POWER”
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.
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?
ATF temperature gradually
increases.
Even if “POWER”
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.
10
CHECK POOR CONTACT.
Is there poor contact in ATF temperature sen-
sor circuit?
There is poor contact.
Repair poor con-
tact.
Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
Step
Value
Yes
No