Subaru Legacy 2004 Service Manual page 2496

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
8 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance between TCM connec-
tor and chassis ground.
Connector & terminal
(B55) No. 4 — Chassis ground:
(B55) No. 3 — Chassis ground:
(B55) No. 14 — Chassis ground:
(B55) No. 13 — Chassis ground:
(B55) No. 20 — Chassis ground:
9 CHECK INPUT SIGNAL FOR TCM USING
CIRCUIT TESTER.
1) Turn the ignition switch to OFF.
2) Disconnect the transmission connector
(B12).
3) Connect the TCM connector.
4) Turn the ignition switch to ON.
5) Measure the voltage between TCM termi-
nals.
Connector & terminal
(B55) No. 4 — (B54) No. 19:
(B55) No. 3 — (B54) No. 19:
(B55) No. 14 — (B54) No. 19:
(B55) No. 13 — (B54) No. 19:
(B55) No. 20 — (B54) No. 19:
10 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.>
11 CHECK HARNESS CONNECTOR BETWEEN
TRANSMISSION AND CONTROL VALVE
BODY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from transmis-
sion.
3) Remove the transmission connector from
bracket.
4) Lift-up the vehicle and place it on rigid
racks.
NOTE:
Raise all wheels off floor.
5) Drain the ATF.
CAUTION:
Do not drain the ATF until it cools down.
6) Remove the oil pan, and disconnect the
connector from control valve body connector.
7) Measure the resistance between transmis-
sion connector and control valve body connec-
tor.
Connector & terminal
(T3) No. 4 — (T5) No. 6:
(T3) No. 3 — (T5) No. 5:
(T3) No. 2 — (T5) No. 4:
(T3) No. 1 — (T5) No. 3:
(T3) No. 8 — (T5) No. 2:
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the resistance more than 1
M"?
Is the voltage 4 — 6 V for the
inhibitor SW 1 — 4?
Is the voltage 3.5 — 5.5 V for
the inhibitor SW 3 monitor?
Is TCM I/O signal OK?
Is the resistance less than 1
"?
5AT(diag)-37
Yes
Go to step 9. Repair the short
circuit in harness
between TCM con-
nector and chassis
ground.
Go to step 11. Go to step 10.
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 12. Repair the open
circuit in harness
between control
valve body con-
nector and trans-
mission connector.
No