Subaru 2009 IMPREZA Service Manual page 2012

Diagnostic Procedure for Subaru Select Monitor Communication
Step
9 CHECK HARNESS CONNECTOR BETWEEN
EACH CONTROL MODULE AND DATA LINK
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors of all control
modules connected to the data link connector
(B40) No. 7.
3) Measure the resistance between TCM con-
nector and chassis ground.
Connector & terminal
(B40) No. 7 — Chassis ground:
10 CHECK OUTPUT SIGNAL OF TCM.
1) Turn the ignition switch to ON.
2) Measure the voltage between TCM and
chassis ground.
Connector & terminal
(B40) No. 7 (+) — Chassis ground (–):
11 CHECK HARNESS CONNECTOR BETWEEN
TCM AND DATA LINK CONNECTOR.
Measure the resistance between TCM connec-
tor and data link connector.
Connector & terminal
(B40) No. 7 — (B54) No. 8:
12 CHECK INSTALLATION OF TRANSMISSION
HARNESS CONNECTOR.
13 CHECK POOR CONTACT OF CONNEC-
TORS.
14 CHECK TCM POWER SUPPLY.
1) Disconnect the connector from TCM.
2) Turn the ignition switch to ON.
3) Measure the voltage between TCM connec-
tor and chassis ground.
Connector & terminal
(B54) No. 25 (+) — Chassis ground (–):
(B54) No. 26 (+) — Chassis ground (–):
(B54) No. 27 (+) — Chassis ground (–):
15 CHECK M/B FUSE (NO. 12).
1) Turn the ignition switch to OFF.
2) Remove the fuse (No. 12).
16 CHECK IGNITION POWER SUPPLY CIR-
CUIT.
1) Turn the ignition switch to ON.
2) Measure the ignition power supply voltage
between TCM connector and chassis ground.
Connector & terminal
(B54) No. 1 (+) — Chassis ground (–):
(B54) No. 2 (+) — Chassis ground (–):
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the resistance 1 M or
more?
Is the voltage 1 V or more?
Is the resistance less than 1 ? Go to step 12.
Is the transmission harness
connector connected to bulk-
head harness connector?
Is there poor contact of control
module power supply and data
link connector?
Is the voltage 10 — 13 V?
Is the fuse (No. 12) blown out? Replace the fuse. If
Is the voltage 10 — 13 V?
4AT(diag)-27
Yes No
Go to step 10. Check harness
and connector
between each con-
trol module and
data link connec-
tor.
Check harness Go to step 11.
and connector
between each con-
trol module and
data link connec-
tor.
Check the harness
and connector
between TCM and
data link connec-
tor.
Go to step 13. Connect the bulk-
head harness con-
nector to
transmission har-
ness connector.
Repair the poor Go to step 14.
contact.
Go to step 16. Go to step 15.
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.
Go to step 18. Go to step 17.