Subaru Legacy 2005 Service Manual page 2512

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
1 CHECK FUSE.
1) Turn the ignition switch to OFF.
2) Remove the MAIN SBF, SBF 8 and fuse
(No. 12), and then check those are not blown
out.
2 CHECK INPUT VOLTAGE FOR PVIGN RE-
LAY.
Measure the voltage between PVIGN relay and
chassis ground.
Connector & terminal
(B357) No. 2 (+) — Chassis ground (
(B357) No. 3 (+) — Chassis ground (
3 CHECK HARNESS BETWEEN PVIGN RE-
LAY OF TCM.
Measure the resistance between TCM connec-
tor and PVIGN relay connector.
Connector & terminal
(B54) No. 10 — (B357) No. 1:
(B54) No. 7 — (B357) No. 4:
(B54) No. 8 — (B357) No. 4:
4 CHECK PVIGN POWER SUPPLY CIRCUIT.
1) Turn the ignition switch to ON. (engine
OFF)
2) Measure the voltage between TCM con-
nector and chassis ground.
Connector & terminal
(B54) No. 7 (+) — Chassis ground (
(B54) No. 8 (+) — Chassis ground (
5 CHECK PVIGN RELAY OUTPUT OF TCM.
Measure the voltage between TCM connector
and chassis ground.
Connector & terminal
(B54) No. 10 (+) — Chassis ground (
Check
Is the fuse blown out?
Is the voltage 10 — 13 V?
−
):
−
):
Is the resistance less than 1
Ω?
Is the voltage 10 — 13 V?
−
):
−
):
Is the voltage less than 1.5 V? Replace the
−
):
5AT(diag)-94
Yes
Replace the fuse. Go to step 2.
If the replaced
fuse has blown out
easily, repair the
short circuit of har-
ness of each fuse.
Go to step 3. Repair the open
circuit of harness
between fuse (No.
12) and PVIGN
relay.
Go to step 4. Repair the open
circuit of harness.
Temporary poor Go to step 5.
contact. Recheck
the harness
between TCM and
relay. (Lightly
move the harness
and check that the
open or short cir-
cuit is not
occurred.)
Replace the TCM.
PVIGN relay. <Ref. to 5AT-61,
Transmission Con-
trol Module
(TCM).>
No