Subaru IMPREZA GD 2007 Series Manual page 2693

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
3 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of harness between
TCM connector and transmission connector.
Connector & terminal
(B55) No. 27 — Chassis ground:
4 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of harness between
TCM connector and transmission connector.
Connector & terminal
(B55) No. 16 — Chassis ground:
5 CHECK FRONT VEHICLE SPEED SENSOR.
Measure the resistance between transmission
connector receptacle's terminals.
Connector & terminal
(T4) No. 14 — No. 18:
6 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Connect all connectors.
2) Connect the Subaru Select Monitor to the
data link connector.
3) Lift up the vehicle.
NOTE:
Raise all wheels off the floor.
4) Turn the ignition switch to ON and run the
Subaru Select Monitor.
5) Start the engine.
6) Read the data of vehicle speed using Sub-
aru Select Monitor.
• Compare the speedometer with Subaru
Select Monitor indications.
• Vehicle speed is indicated in "km/h" or "MPH"
7) Slowly increase the vehicle speed to 60 km/
h or 37 MPH.
NOTE:
The speed difference between front and rear
wheels may illuminate the ABS warning light,
but this does not indicate a malfunction. When
AT control diagnosis is finished, perform the
ABS memory clearance procedure of on-board
diagnostics system. <Ref. to ABS(diag)-26,
Clear Memory Mode.>
Check
Is the resistance 1 MΩ or
more?
Is the resistance 1 MΩ or
more?
Is the resistance 450 — 650 Ω? Go to step 6.
Does the speedometer indica-
tion increase as the Subaru
Select Monitor front wheel
speed data increases?
4AT(D)(diag)-54
Yes No
Go to step 4. Repair the short
circuit of harness
between TCM and
transmission con-
nector.
Go to step 5. Repair the short
circuit of the har-
ness between
TCM and transmis-
sion connector,
and poor contact of
connector.
Replace the front
vehicle speed sen-
sor. <Ref. to 4AT-
51, Front Vehicle
Speed Sensor.>
Even if the ATF Repair the poor
temperature warn- contact.
ing light blinks, the
circuit is in normal
condition at this
time. A temporary
poor contact of
connector or har-
ness may be the
cause. Repair the
harness in of front
vehicle speed sen-
sor circuit.