Subaru 2009 IMPREZA Service Manual page 2044

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
4 CHECK OUTPUT SIGNAL OF TCM.
1) Connect the connectors to TCM and trans-
mission.
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 "P" or "N" range, and
depress the accelerator pedal.
9) Read the data of "Low Clutch Duty" using
Subaru Select Monitor.
5 CHECK OUTPUT SIGNAL FROM TCM US-
ING SUBARU SELECT MONITOR.
1) Turn the ignition switch to ON.
2) Set the select lever to the "D" range.
3) Read the data of "Low Clutch Duty" using
Subaru Select Monitor.
6 CHECK POOR CONTACT.
7 CHECK LOW CLUTCH 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 control
valve body.
5) Measure the resistance between low clutch
duty solenoid connector and transmission
ground.
Connector & terminal
(AT2) No. 2 — Transmission ground:
8 CHECK HARNESS CONNECTOR BETWEEN
TRANSMISSION AND LOW CLUTCH DUTY
SOLENOID.
Measure the resistance of harness between low
clutch duty solenoid and transmission connec-
tor.
Connector & terminal
(T4) No. 4 — (AT2) No. 2:
9 CHECK HARNESS CONNECTOR BETWEEN
TRANSMISSION AND LOW CLUTCH DUTY
SOLENOID.
Measure the resistance of harness between
transmission connector and transmission
ground.
Connector & terminal
(T4) No. 4 — Transmission ground:
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the measured value 100%?
Is the measured value 0%?
Is there poor contact of low
clutch 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)-59
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 low clutch
duty solenoid and
transmission con-
nector.
Check the har-
Repair the short
nesses or connec- circuit of harness
tors between low between low clutch
clutch duty sole- duty solenoid and
noid and transmis- transmission con-
sion, and repair the nector.
defective part.