Subaru 2006 Legacy, Manual

Page: 3541 / 4302

5AT(diag)-48
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step Check Yes No
1 CHECK TCM I/O SIGNAL.
Check I/O signal of power supply, ground and
PVIGN power supply relay.
<Ref. to 5AT(diag)-12, ELECTRICAL SPECIFI-
CATION, Transmission Control Module (TCM)
I/O Signal.>
Is TCM I/O signal OK? Go to step
2
. Repair the open or
short circuit for
power supply and
ground. Perform
the diagnosis
according to DTC
P0882 for PVIGN
power supply
relay.
2 CHECK TCM AND TRANSMISSION HAR-
NESS CONNECTOR.
1) Disconnect the connectors from TCM and
transmission.
2) Measure the resistance of harness
between TCM connector and transmission
connector.
Connector & terminal
(B54) No. 16 — (B11) No. 7:
(B55) No. 7 — (B11) No. 1:
Is the resistance less than 1
Ω
?
Go to step
3
. Repair the open
circuit of harness
between TCM and
transmission con-
nector.
3 CHECK TCM AND TRANSMISSION HAR-
NESS CONNECTOR.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B55) No. 7 — Chassis ground:
(B54) No. 16 — Chassis ground:
Is the resistance 1 M
Ω
or
more?
Go to step 4 . Repair the short
circuit of harness
between TCM and
transmission con-
nector.
4 CHECK TCM POWER SUPPLY OUTPUT.
1) Connect the connector to TCM. (Transmis-
sion connector is disconnected)
2) Turn the ignition switch to ON. (engine
OFF)
3) Measure the voltage between transmission
connector and chassis ground.
Connector & terminal
(B11) No. 7 (+) — Chassis ground (–):
Is the voltage 10 — 13 V? Go to step 5 . Replace the TCM.
<Ref. to 5AT-56,
Transmission Con-
trol Module
(TCM).>
5 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Connect all connectors.
2) Lift-up the vehicle and support with rigid
racks.
NOTE:
Raise all wheels off floor.
3) Start the engine, and drive it.
4) Read the current data of front wheel speed
using Subaru Select Monitor. <Ref. to
5AT(diag)-16, READ CURRENT DATA, OPER-
ATION, Subaru Select Monitor.>
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 VDC(diag)-20, CLEAR
MEMORY MODE, OPERATION, Subaru Se-
lect Monitor.>
Does the value of the front
wheel speed change depend-
ing on the acceleration and
deceleration of the vehicle? Even if the SPORT
indicator light
blinks, the system
is in normal condi-
tion. A temporary
poor contact of
connector or har-
ness may be the
cause. Repair the
poor contact of
harness between
ATF temperature
sensor and trans-
mission connector. Go to step 6 .
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