Subaru Legacy 2005 Service Manual page 2455

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
1 CHECK DTC OF TCM.
2 CHECK INHIBITOR SWITCH.
1) Shift the select lever to "P" range.
2) Check input signal of inhibitor SW 1 — 4
and inhibitor SW 3 monitor using Subaru
Select Monitor.
3 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 between TCM con-
nector and chassis ground about the item
which indicated Low on step 2.
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:
4 CHECK INHIBITOR SWITCH.
1) Shift the select lever to "D" range.
2) Check input signal of inhibitor SW 1 — 4
and inhibitor SW 3 monitor using Subaru
Select Monitor.
5 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
about the item which indicated High on step 4.
Connector & terminal
(B55) No. 4 — (B12) No. 4:
(B55) No. 3 — (B12) No. 3:
(B55) No. 14 — (B12) No. 2:
(B55) No. 13 — (B12) No. 1:
(B55) No. 20 — (B12) No. 8:
6 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:
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is DTC of AT CAN communica-
tion circuit displayed?
Are all indications High?
Is the resistance more than 1
MΩ?
Are all indications Low?
Is the resistance less than 1
Ω?
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?
5AT(diag)-37
Yes
Perform the diag- Go to step 2.
nosis according to
DTC.
Go to step 4. Go to step 3.
Go to step 6. Repair the short
circuit of harness
between TCM con-
nector and chassis
ground.
Go to step 6. Go to step 5.
Go to step 6. Repair the open
circuit of harness
between TCM con-
nector and trans-
mission connector.
Go to step 8. Go to step 7.
No