Subaru 2006 Legacy, Manual

Page: 3597 / 4302

5AT(diag)-104
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 SPECIFICATION, Transmis-
sion 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
(B55) No. 22 — (B12) No. 6:
(B54) No. 16 — (B11) No. 7:
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. 22 — 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 set the vehicle in 1st
speed driving condition of manual mode.
4) Read the current data of torque converter
turbine speed 2 using Subaru Select Monitor.
<Ref. to 5AT(diag)-16, OPERATION, 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 turbine
speed sensor 2 change
depending on the acceleration,
deceleration and shifting gear
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 of turbine
speed sensor 2
and transmission
connector. Go to step 6 .
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