Subaru Legacy 2005 Service Manual page 2446

Diagnostic Procedure for Subaru Select Monitor Communication
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
1 CHECK SUBARU SELECT MONITOR POW-
ER SUPPLY CIRCUIT.
Measure the voltage between data link con-
nector and chassis ground.
Connector & terminal
(B40) No. 1 (+) — Chassis ground (
2 CHECK SUBARU SELECT MONITOR
GROUND CIRCUIT.
Measure the resistance of harness between
data link connector and chassis ground.
Connector & terminal
(B40) No. 12 — Chassis ground:
(B40) No. 13 — Chassis ground:
3 CHECK COMMUNICATION OF SUBARU SE-
LECT MONITOR.
1) Turn the ignition switch to ON.
2) Using the Subaru Select Monitor, check
whether communication to transmission sys-
tems can be executed normally.
4 CHECK COMMUNICATION OF SUBARU SE-
LECT MONITOR.
1) Turn the ignition switch to OFF.
2) Disconnect the TCM connector.
3) Turn the ignition switch to ON.
4) Check whether communication to engine
systems can be executed normally.
5 CHECK COMMUNICATION OF SUBARU SE-
LECT MONITOR.
1) Turn the ignition switch to OFF.
2) Connect the TCM connector.
3) Disconnect the ECM connector.
4) Turn the ignition switch to ON.
5) Check whether communication to transmis-
sion systems can be executed normally.
6 CHECK HARNESS CONNECTOR BETWEEN
EACH CONTROL MODULE AND DATA LINK
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the TCM and ECM connector.
3) Measure the resistance between TCM con-
nector and chassis ground.
Connector & terminal
(B40) No. 10 — Chassis ground:
7 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. 10 (+) — Chassis ground (
8 CHECK HARNESS CONNECTOR BETWEEN
TCM AND DATA LINK CONNECTOR.
Measure the resistance between TCM connec-
tor and data link connector.
Connector & terminal
(B54) No. 20 — (B40) No. 10:
Check
Is the voltage more than 10 V? Go to step 2.
−
):
Is the resistance less than 1
Ω?
Are the name and year of sys-
tem displayed on Subaru
Select Monitor?
Are the name and year of sys-
tem displayed on Subaru
Select Monitor?
Are the name and year of sys-
tem displayed on Subaru
Select Monitor?
Is the resistance more than 1
MΩ?
Is the voltage more than 1 V?
−
):
Is the resistance less than 1
Ω?
5AT(diag)-28
Yes
Repair the har-
ness connector
and connector
between battery
and data link con-
nector, and poor
contact in connec-
tor.
Go to step 3. Repair the open
circuit of harness
between data link
connector and
ground terminal,
and poor contact
in connector.
Go to step 8. Go to step 4.
Go to step 6. Go to step 5.
Inspect the ECM. Go to step 6.
Go to step 7. Check harness
and connector
between each con-
trol module and
data link connec-
tor.
Check harness Go to step 8.
and connector
between each con-
trol module and
data link connec-
tor.
Go to step 9. Repair the har-
ness and connec-
tor between TCM
and data link con-
nector.
No