Subaru Legacy 2004 Service Manual page 2505

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
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. 16 — (B12) No. 7:
(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. 16 — Chassis ground:
(B54) No. 16 — Chassis ground:
3 CHECK TCM POWER SUPPLY OUTPUT.
1) Connect the TCM connector. (Transmission
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. 16 (+) — (B54) No. 19 (
5 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.>
6 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).
Check
Is the resistance less than 1
"?
Is the resistance more than 1
M"?
Is the voltage 10 — 13 V?
$
):
Is the voltage 4 — 6 V?
$
):
Is TCM I/O signal OK?
Is the ground connecting har-
ness connected to transmis-
sion body securely?
And there are no excessive
damages on harness and ter-
minal?
5AT(diag)-46
Yes
Go to step 2. Repair the open
circuit in harness
between TCM and
transmission con-
nector.
Go to step 3. Repair the short
circuit in harness
between TCM and
chassis ground.
Go to step 4. Go to step 5.
Go to step 6. Go to step 5.
Replace the TCM. Repair the open or
<Ref. to 5AT-61, short circuit for
Transmission Con- power supply and
trol Module ground. Perform
(TCM).> the diagnosis
according to DTC
for PVIGN power
supply relay.
Go to step 7. If the poor installa-
tion of ground
occurs, install it
securely. Replace
the transmission
assembly when
the harness or ter-
minal is damaged.
<Ref. to 5AT-38,
Automatic Trans-
mission Assem-
bly.>
No