Subaru IMPREZA GD 2007 Series Manual page 2685

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ATF TEMPERATURE SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from TCM.
3) Measure the resistance between TCM con-
nector terminals.
Connector & terminal
(B55) No. 23 — No. 12:
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ATF TEMPERATURE SENSOR.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B55) No. 23 — Chassis ground:
3 CHECK HARNESS.
Measure the resistance between TCM connec-
tor terminals while shaking the harness.
Connector & terminal
(B55) No. 23 — No. 12:
4 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ATF TEMPERATURE SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from transmis-
sion.
3) Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B55) No. 23 — Chassis ground:
5 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ATF TEMPERATURE SENSOR.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B55) No. 12 — Chassis ground:
6 CHECK ATF TEMPERATURE SENSOR.
Measure the resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 11 — No. 15:
7 CHECK TRANSMISSION HARNESS.
1) Lift up the vehicle.
2) Drain the automatic transmission fluid.
CAUTION:
Do not drain ATF until it cools down.
3) Remove the oil pan.
4) Disconnect the harness connector from
control valve.
5) Measure the resistance between ATF tem-
perature sensor connector terminals.
6) Measure the resistance between transmis-
sion connector and transmission ground.
Connector & terminal
(T4) No. 11 — Transmission ground:
Check
Is the resistance 500 Ω or
more?
Is the resistance 1 MΩ or
more?
Does the resistance change?
Is the resistance 1 MΩ or
more?
Is the resistance 1 MΩ or
more?
Is the resistance 500 Ω or
more?
Is the resistance 1 MΩ or
more?
4AT(D)(diag)-46
Yes No
Go to step 2. Go to step 4.
Go to step 3. Go to step 4.
Go to step 4. Repair the poor
contact.
Go to step 5.
Repair the short
circuit of harness
between TCM and
transmission har-
ness.
Go to step 6. Repair the short
circuit of harness
between TCM and
transmission har-
ness.
Go to step 7.
Even if the ATF
temperature warn-
ing light blinks, the
circuit is in normal
condition at this
time. A temporary
short circuit of con-
nector or harness
may be the cause.
Repair the harness
or connector.
Go to step 8. Replace the trans-
mission harness.