Subaru LEGACY 2006 Manual page 3458

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND SHIFT LOCK SOLENOID.
Measure the resistance of the harness
between TCM and chassis ground.
Connector & terminal
(B55) No. 18 — Chassis ground:
3 CHECK HARNESS BETWEEN SHIFT LOCK
SOLENOID AND CHASSIS GROUND TERMI-
NAL.
Measure the resistance of harness between
shift lock solenoid and chassis ground.
Connector & terminal
(B116) No. 4 — Chassis ground:
4 CHECK SHIFT LOCK SOLENOID.
Measure the resistance of shift lock solenoid
terminals.
Connector & terminal
(B116) No. 3 — No. 4:
5 CHECK OUTPUT SIGNAL OF TCM.
1) Connect all connectors.
2) Turn the ignition switch to ON.
3) Shift the select lever to "D" range.
4) Measure the voltage between TCM and
chassis ground.
Connector & terminal
(B55) No. 18 (+) — Chassis ground (–):
6 CHECK OUTPUT SIGNAL OF TCM.
1) Lift up the vehicle and support with rigid
racks.
NOTE:
Raise all wheels off the floor.
2) Start the engine.
3) Shift the select lever to "D" range and
slowly increase vehicle speed to over 20 km/h
(12 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.>
4) Measure the voltage between TCM and
chassis ground.
Connector & terminal
(B55) No. 18 (+) — Chassis ground (–):
7 CHECK POOR CONTACT.
Check
Is the resistance more than 1
MΩ?
Is the resistance less than 1
Ω?
Is the resistance between 12
— 18 Ω?
Is the voltage more than 10.5
V?
Is the voltage less than 1 V?
Is there poor contact in the
reverse inhibitor control circuit?
4AT(diag)-72
Yes No
Go to step 3. Repair the short
circuit of harness
between TCM and
shift lock solenoid
connector.
Go to step 4. Repair the open
circuit of harness
between chassis
ground and shift
lock solenoid con-
nector.
Go to step 5. Replace the shift
lock solenoid.
Go to step 6. Go to step 7.
Even if the SPORT Go to step 7.
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 or con-
nector in the
reverse inhibitor
control circuit.
Repair the poor Replace the TCM.
contact. <Ref. to 4AT-62,
Transmission Con-
trol Module
(TCM).>