Subaru 2009 IMPREZA Service Manual page 2013

Diagnostic Procedure for Subaru Select Monitor Communication
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
17 CHECK F/B FUSE (NO. 12).
Remove the fuse (No. 12).
18 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
(B54) No. 20 — (B11) No. 20:
(B54) No. 21 — (B11) No. 20:
(B54) No. 22 — (B11) No. 19:
(B54) No. 23 — (B11) No. 19:
19 CHECK HARNESS CONNECTOR BETWEEN
TRANSMISSION AND TRANSMISSION
GROUND.
Measure the resistance of the harness between
transmission and transmission ground.
Connector & terminal
(T4) No. 19 — Transmission ground:
(T4) No. 20 — Transmission ground:
20 CHECK POOR CONTACT OF CONNEC-
TORS.
Check
Is the fuse (No. 12) blown out? Replace the fuse. If
Is the resistance less than 1 ? Go to step 19.
Is the resistance less than 1 ? Go to step 20.
Is there poor contact of TCM
power supply, ground and data
link connector?
4AT(diag)-28
Yes No
Repair the open
the replaced fuse circuit of harness
has blown out eas- between fuse and
ily, repair short cir- TCM, or fuse and
cuit of harness battery, and poor
between fuse and contact of the con-
TCM. nector.
Repair the open
circuit of harness
between TCM and
transmission har-
ness connector,
and poor contact of
connector.
Repair the open
circuit of the har-
ness between
transmission and
transmission
ground.
Repair the connec- Replace the TCM.
tor. <Ref. to 4AT-63,
Transmission Con-
trol Module
(TCM).>