5AT(diag)-43
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
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:
Is the resistance more than 1
M
Ω?
Go to step 2.
Repair the short
circuit of harness
between TCM and
transmission con-
nector.
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 exceeds 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:
Is the resistance 500 — 1,200
Ω
Go to step 3.
Go to step 5.
3
CHECK ATF TEMPERATURE SENSOR.
Measure the resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 5 — (T4) No. 12:
Does the resistance value
increase while the ATF temper-
ature decreases?
Go to step 4.
Go to step 5.
4
CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Connect the connector.
2) Turn the ignition switch to ON. (Engine
OFF)
3) Read the ATF temperature using Subaru
Select Monitor.
Does the ATF temperature
gradually decrease?
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.
Go to step 6.