Subaru 2009 IMPREZA Service Manual page 2049

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
6 CHECK POOR CONTACT.
7 CHECK HIGH 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 control valve body connec-
tor.
5) Measure the resistance between high clutch
duty solenoid connector and transmission
ground.
Connector & terminal
(AT2) No. 3 — Transmission ground:
8 CHECK HARNESS CONNECTOR BETWEEN
HIGH CLUTCH DUTY SOLENOID AND
TRANSMISSION.
Measure the resistance of harness between
high clutch duty solenoid and transmission con-
nector.
Connector & terminal
(T4) No. 7 — (AT2) No. 3:
9 CHECK HARNESS CONNECTOR BETWEEN
HIGH CLUTCH DUTY SOLENOID AND
TRANSMISSION.
Measure the resistance of harness between
transmission connector and transmission
ground.
Connector & terminal
(T4) No. 7 — Transmission ground:
Check
Is there poor contact of high
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)-64
Yes No
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 TCM and
transmission con-
nector.
Check the har- Repair the short
nesses or connec- circuit of harness
tors between high between high
clutch duty sole- clutch duty sole-
noid and transmis- noid and transmis-
sion, and repair the sion connector.
defective part.