Subaru 2002 IMPREZA Service Manual page 1633

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ATF TEMPERATURE SENSOR.
Measure the 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 the 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 the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B54) No. 11 — Chassis ground:
5 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 ATF temper-
ature reaches to 80°C (176°F).
NOTE:
If ambient temperature is below 0°C (32°F),
drive the vehicle until ATF reaches its operating
temperature.
5)Disconnect the connector from transmission.
6)Measure the resistance between transmis-
sion connector terminals.
Connector & terminal
(T4) No. 11 — No. 12:
6 CHECK ATF TEMPERATURE SENSOR.
1)Turn the ignition switch to ON (engine OFF).
2)Measure the resistance between transmis-
sion connector terminals.
Connector & terminal
(T4) No. 11 — No. 12:
7 PREPARE SUBARU SELECT MONITOR.
8 CHECK INPUT SIGNAL FOR TCM.
1)Connect the connector to transmission.
2)Warm-up the transmission until ATF temper-
ature is about 80°C (176°F).
NOTE:
If ambient temperature is below 0°C (32°F),
drive the vehicle until ATF reaches its operating
temperature.
3)Measure the voltage between TCM connec-
tor terminal.
Connector & terminal
(B54) No. 11 (+) — No. 20 ( − − − − ):
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
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 ATF tempera-
ture decreases?
Do you have a Subaru Select
Monitor?
Is the voltage between 0.4 and
0.9 V?
AT-47
Yes
Go to step 3. Repair the open
circuit in harness
between TCM and
transmission con-
nector.
Go to step 4. Repair the short
circuit in harness
between TCM and
transmission con-
nector.
Go to step 5. Repair the short
circuit in harness
between TCM and
transmission con-
nector.
Go to step 6. Go to step 11.
Go to step 7. Go to step 11.
Go to step 9. Go to step 8.
Even if the Go to step 10.
POWER indicator
lights up, the cir-
cuit has returned
to a normal condi-
tion at this time.
Temporary poor
contact of the con-
nector or harness
may be the cause.
Repair the har-
ness or contact in
ATF temperature
sensor and trans-
mission connector.
No