Subaru 2009 IMPREZA Service Manual page 2046

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
4 CHECK OUTPUT SIGNAL OF TCM.
1) Connect all connectors.
2) Connect the Subaru Select Monitor to data
link connector.
3) Start the engine.
4) Run the Subaru Select Monitor.
5) Warm up the transmission until the ATF
temperature exceeds approximately 80°C
(176°F).
6) Stop the engine.
7) Turn the ignition switch to ON.
8) Shift the select lever to "N" range, and
depress the accelerator pedal.
9) Read the data of "Brake Clutch Duty Ratio"
using Subaru Select Monitor.
5 CHECK OUTPUT SIGNAL OF TCM.
1) Shift the select lever to "D" range. (2nd gear
in manual mode).
2) Read the data of "Brake Clutch Duty Ratio"
using Subaru Select Monitor.
6 CHECK POOR CONTACT.
7 CHECK 2-4 BRAKE DUTY SOLENOID (IN
TRANSMISSION).
1) Remove the transmission connector from
bracket.
2) Drain the automatic transmission fluid.
CAUTION:
Do not drain ATF until it cools down.
3) Remove the oil pan.
4) Disconnect the connector from the 2-4
brake duty solenoid.
5) Measure the resistance of harness between
2-4 brake duty solenoid connector and trans-
mission ground.
Connector & terminal
(AT2) No. 8 — Transmission ground:
8 CHECK HARNESS CONNECTOR BETWEEN
2-4 BRAKE DUTY SOLENOID AND TRANS-
MISSION.
Measure the resistance of harness between 2-4
brake duty solenoid and transmission connec-
tor.
Connector & terminal
(T4) No. 3 — (AT2) No. 8:
9 CHECK HARNESS CONNECTOR BETWEEN
2-4 BRAKE DUTY SOLENOID AND TRANS-
MISSION.
Measure the resistance of harness between
transmission connector and transmission
ground.
Connector & terminal
(T4) No. 3 — Transmission ground:
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the measured value 100%?
Is the measured value 0%?
Is there poor contact of 2-4
brake duty solenoid circuit?
Is the resistance 2.0 — 6.0 ? Go to step 8.
Is the resistance less than 1 ? Go to step 9.
Is the resistance 1 M or
more?
4AT(diag)-61
Yes No
Go to step 5. Go to step 6.
Check the har- Go to step 6.
nesses or connec-
tors between TCM
and transmission,
and repair the
defective part.
Repair the poor Replace the TCM.
contact. <Ref. to 4AT-63,
Transmission Con-
trol Module
(TCM).>
Replace the con-
trol valve body.
<Ref. to 4AT-58,
Control Valve
Body.>
Repair the open
circuit of harness
between 2-4 brake
duty solenoid and
transmission con-
nector.
Check the har- Repair the short
nesses or connec- circuit of harness
tors between 2-4 between 2-4 brake
brake duty sole- duty solenoid and
noid and transmis- transmission con-
sion, and repair the nector.
defective part.