Subaru IMPREZA GD 2007 Series Manual page 2723

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
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 transmission connector.
Connector & terminal
(B55) No. 5 — (B11) No. 8:
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of harness connector
between TCM and chassis ground.
Connector & terminal
(B55) No. 5 — Chassis ground:
3 CHECK TRANSFER DUTY SOLENOID.
Measure the resistance between transmission
connector and transmission terminals.
Connector & terminal
(T4) No. 8 — No. 20:
4 CHECK TRANSFER DUTY SOLENOID (IN
TRANSMISSION).
1) Lift up the vehicle.
NOTE:
Raise all wheels off the floor.
2) Drain the automatic transmission fluid.
CAUTION:
Do not drain ATF until it cools down.
3) Remove the extension case, and discon-
nect the connector from transfer duty solenoid.
4) Measure the resistance between transfer
duty solenoid connector and transmission
ground.
Connector & terminal
(AT12) No. 5 — Transmission ground:
5 CHECK HARNESS CONNECTOR BETWEEN
TRANSFER DUTY SOLENOID AND TRANS-
MISSION.
Measure the resistance of harness between
transfer duty solenoid and transmission con-
nector.
Connector & terminal
(T4) No. 8 — (AT12) No. 5:
6 CHECK HARNESS CONNECTOR BETWEEN
TRANSFER DUTY SOLENOID AND TRANS-
MISSION.
Measure the resistance of harness between
transmission connector and transmission
ground.
Connector & terminal
(T4) No. 8 — Transmission ground:
Check
Is resistance less than 1 Ω?
Is the resistance 1 MΩ or
more?
Is the resistance 2.0 — 6.0 Ω? Go to step 5.
Is the resistance 2.0 — 6.0 Ω? Go to step 5.
Is resistance less than 1 Ω?
Is the resistance 1 MΩ or
more?
4AT(D)(diag)-84
Yes No
Go to step 2. Repair the open
circuit of harness
between TCM and
transmission con-
nector.
Go to step 3. Repair the ground
short circuit of har-
ness between
TCM and transmis-
sion connector.
Go to step 4.
Replace the con-
trol valve body.
<Ref. to 4AT-59,
Control Valve
Body.>
Go to step 6. Repair the open
circuit of harness
between transfer
duty solenoid and
transmission con-
nector.
Even if the ATF Repair short cir-
temperature warn- cuit of harness
ing light blinks, the between the trans-
circuit is in normal fer duty solenoid
condition at this and transmission
time. A temporary connector.
poor contact of
connector or har-
ness may be the
cause. Repair the
harness or poor
contact in the
transfer duty sole-
noid and transmis-
sion.