Subaru LEGACY 2006 Manual page 3433

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of the harness
between TCM connector and transmission
connector.
Connector & terminal
(B54) No. 15 — (B11) No. 18:
3 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of the harness
between TCM connector and transmission
connector.
Connector & terminal
(B54) No. 6 — Chassis ground:
4 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of the harness
between TCM connector and transmission
connector.
Connector & terminal
(B54) No. 15 — 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 and support with rigid
racks.
NOTE:
Raise all wheels off the floor.
4) Turn the ignition switch to ON, and the Sub-
aru Select Monitor power switch to ON.
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 (37 MPH).
NOTE:
The speed difference between front and rear
wheels may light the ABS warning light, but this
does not indicate a malfunction. When AT con-
trol diagnosis is finished, perform the ABS
memory clearance procedure of on-board diag-
nostics system. <Ref. to ABS(diag)-25, Clear
Memory Mode.>
7 CHECK POOR CONTACT.
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the resistance more than 1
MΩ?
Is the resistance between 450
— 650 Ω?
Does the speedometer indica-
tion increase as the Subaru
Select Monitor front wheel
speed data increases?
Is there poor contact in front
vehicle speed sensor circuit?
4AT(diag)-47
Yes No
Go to step 3. Repair the open
circuit of harness
between TCM and
transmission con-
nector, and poor
contact of the con-
nector.
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 trans-
mission connec-
tor, and poor
contact of connec-
tor.
Go to step 6. Replace the front
vehicle speed sen-
sor. <Ref. to 4AT-
50, Front Vehicle
Speed Sensor.>
Go to step 7.
Even if the SPORT
indicator light is
blinking, the cir-
cuit 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.
Repair the poor Replace the TCM.
contact. <Ref. to 4AT-62,
Transmission Con-
trol Module
(TCM).>