Subaru Legacy 2004 Service Manual page 2502

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM and
transmission.
3) Measure the resistance of harness
between TCM connector and chassis ground.
Connector & terminal
(B54) No. 13 — Chassis ground:
(B54) No. 2 — Chassis ground:
2 CHECK ATF TEMPERATURE SENSOR.
1) Turn the ignition switch to OFF.
2) Connect the connectors to transmission
and TCM.
3) Turn the ignition switch to ON and start
engine.
4) Warm-up the transmission until the ATF
temperature reaches to 80#C (176#F).
NOTE:
If the ambient temperature is below 0#C (32#F),
drive the vehicle until the ATF reaches its oper-
ating temperature.
5) Disconnect the connector from transmis-
sion.
6) Measure the resistance between transmis-
sion connector terminals.
Connector & terminal
(T4) No. 5 — (T4) No. 12:
3 CHECK ATF TEMPERATURE SENSOR.
Measure the resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 5 — (T4) No. 12:
4 PREPARE SUBARU SELECT MONITOR.
5 CHECK INPUT SIGNAL FROM TCM.
1) Connect the connector to transmission.
2) Warm-up the transmission until the ATF
temperature is approx. 80#C (176#F).
NOTE:
If the ambient temperature is below 0#C (32#F),
drive the vehicle until the ATF reaches its oper-
ating temperature.
3) Measure the voltage between TCM con-
nector terminals.
Connector & terminal
(B54) No. 2 (+) — (B54) No. 13 (
Check
Is the resistance more than 1
M"?
Is the resistance 500 — 1,200
"?
Does the resistance value
increase while the ATF temper-
ature decreases?
Do you have a Subaru Select
Monitor?
Is the voltage 0.5 — 1.2 V?
$
):
5AT(diag)-43
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 6.
Even if the SPORT
indicator lights
blinks, the system
is in normal condi-
tion. A temporary
poor contact of
connector or har-
ness may be the
cause. Repair the
poor contact of
harness between
ATF temperature
sensor and trans-
mission connector.
No
Repair the short
circuit in harness
between TCM and
transmission con-
nector.
Go to step 7.
Go to step 7.
Go to step 5.
Go to step 8.