Subaru LEGACY 2006 Manual page 3536

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
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.>
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. 16 — (B12) No. 7:
3 CHECK TCM AND TRANSMISSION HAR-
NESS CONNECTOR.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B54) No. 16 — Chassis ground:
(B55) No. 16 — Chassis ground:
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 (–):
5 CHECK HARNESS ASSEMBLY (TURBINE
SPEED SENSOR GROUND).
Check the installing condition of ground con-
necting harness of harness assembly (used for
both of turbine speed sensor 1, rear vehicle
speed sensor).
6 CHECK HARNESS ASSEMBLY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from transmis-
sion.
3) Disconnect the connector from turbine
speed sensor 1.
4) Measure the resistance between transmis-
sion connector and turbine speed sensor 1
connector.
Connector & terminal
(T4) No. 7 — (AT1) No. 3:
(T3) No. 7 — (AT1) No. 2:
(AT1) No. 1 — Chassis ground:
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is TCM I/O signal OK?
Is the resistance less than 1
Ω?
Is the resistance 1 MΩ or
more?
Is the voltage 10 — 13 V?
Is the ground connecting har-
ness installed securely to the
transmission body? Is there
any serious damage in the har-
ness and terminal?
Is the resistance less than 1
Ω?
5AT(diag)-43
Yes No
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.
Go to step 3. Repair the open
circuit of harness
between TCM and
transmission con-
nector.
Go to step 4. Repair the short
circuit of harness
between TCM and
transmission con-
nector.
Go to step 5.
Replace the TCM.
<Ref. to 5AT-56,
Transmission Con-
trol Module
(TCM).>
Go to step 6.
When poor instal-
lation of ground
occurs, install it
securely. Replace
the transmission
assembly if the
harness or termi-
nal is damaged.
<Ref. to 5AT-34,
Automatic Trans-
mission Assem-
bly.>
Go to step 7.
Repair the open
circuit of harness
between TCM and
transmission con-
nector, or poor
contact of connec-
tor.