Subaru Legacy 2005 Service Manual page 2525

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM and
transmission.
3) Measure the resistance of harness
between TCM and transmission connector.
Connector & terminal
(B55) No. 22 — (B12) No. 6:
(B54) No. 16 — (B11) No. 7:
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B55) No. 22 — Chassis ground:
(B54) No. 16 — Chassis ground:
3 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 TCM con-
nector and chassis ground.
Connector & terminal
(B54) No. 16 (+) — Chassis ground:
4 CHECK TURBINE SPEED SENSOR INPUT
CIRCUIT OF TCM.
Measure the voltage between TCM connector
terminals.
Connector & terminal
(B55) No. 22 (+) — (B54) No. 19 (
5 CHECK TCM I/O SIGNAL.
Check TCM I/O signal of power supply, ground
and PVIGN power supply relay.
<Ref. to 5AT(diag)-13, ELECTRICAL SPECIFI-
CATION, Transmission Control Module (TCM)
I/O Signal.>
Check
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the voltage 10 — 13 V?
Is the voltage 4 — 6 V?
−
):
Is I/O signal OK?
5AT(diag)-107
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 6.
Replace the TCM.
<Ref. to 5AT-61,
Transmission Con-
trol Module
(TCM).>
No
Repair the open
circuit of harness
between TCM and
transmission con-
nector.
Repair the short
circuit of harness
between TCM and
transmission con-
nector.
Go to step 5.
Go to step 5.
Repair the open or
short circuit for
power supply and
ground. Perform
the diagnosis
according to DTC
for PVIGN power
supply relay.