Subaru 2009 IMPREZA Service Manual page 2048

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
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
(B54) No. 6 — (B11) No. 7:
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of the harness connec-
tor between TCM connector and chassis
ground.
Connector & terminal
(B54) No. 6 — Chassis ground:
3 CHECK HIGH CLUTCH DUTY SOLENOID.
Measure the resistance between transmission
connector receptacle's terminals.
Connector & terminal
(T4) No. 7 — No. 20:
4 CHECK OUTPUT SIGNAL OF TCM.
1) Connect the connectors to TCM and trans-
mission.
2) Lift up the vehicle.
3) Connect the Subaru Select Monitor to data
link connector.
4) Start the engine.
5) Run the Subaru Select Monitor.
6) Warm up the engine until the ATF tempera-
ture exceeds 80°C (176°F).
7) Shift the select lever to "D" range, and slowly
increase vehicle speed to measure at 3rd or
4th.
NOTE:
The speed difference between front and rear
wheels lights the ABS warning light or the VDC
warning light, but this does not indicate a mal-
function. If the warning light is illuminated, clear
the memory of ABS or VDC after completing AT
control diagnosis. <Ref. to ABS(diag)-21, Clear
Memory Mode.> <Ref. to VDC(diag)-24, Clear
Memory Mode.>
8) Read the data of "High Clutch Duty Ratio"
using Subaru Select Monitor.
5 CHECK OUTPUT SIGNAL OF TCM.
1) Return the engine speed to idle.
2) Set the select lever to "N" range.
NOTE:
The speed difference between front and rear
wheels lights the ABS warning light or the VDC
warning light, but this does not indicate a mal-
function. If the warning light is illuminated, clear
the memory of ABS or VDC after completing AT
control diagnosis. <Ref. to ABS(diag)-21, Clear
Memory Mode.> <Ref. to VDC(diag)-24, Clear
Memory Mode.>
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the resistance less than 1 ? Go to step 2.
Is the resistance 1 M or
more?
Is the resistance 2.0 — 6.0 ? Go to step 4.
Is the measured value 0%?
Is the measured value 100%?
4AT(diag)-63
Yes No
Repair the open
circuit of harness
between TCM and
transmission con-
nector.
Go to step 3. Repair the short
circuit of harness
between TCM and
transmission con-
nector.
Go to step 7.
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.