Subaru Legacy 2002 Service Manual page 1807

DIAGNOSTIC PROCEDURE FOR SELECT MONITOR COMMUNICATION
Automatic Transmission (Diagnostics)
No.
1 CHECK SUBARU SELECT MONITOR
POWER SUPPLY CIRCUIT.
Measure voltage between data link connector
and chassis ground.
Connector & terminal
(B40) No. 1 — Chassis ground:
2 CHECK SUBARU SELECT MONITOR
GROUND CIRCUIT.
Measure 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 SELECT
MONITOR.
1) Turn ignition switch to ON.
2) Using the select monitor, check whether
communication to engine systems can be
executed normally.
4 CHECK COMMUNICATION OF SELECT
MONITOR.
1) Turn ignition switch to OFF.
2) Disconnect TCM connector.
3) Check whether communication to engine
systems can be executed normally.
5 CHECK COMMUNICATION OF SELECT
MONITOR.
1) Turn ignition switch to OFF.
2) Connect TCM connector.
3) Disconnect ECM connector.
4) 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 ignition switch to OFF.
2) Disconnect TCM and ECM connectors.
3) Measure resistance between data link con-
nector and chassis ground.
Connector & terminal
(B40) No. 10 — Chassis ground:
(B40) No. 6 — Chassis ground:
7 CHECK OUTPUT SIGNAL FOR TCM.
1) Turn ignition switch to ON.
2) Measure voltage between data link connec-
tor and chassis ground.
Connector & terminal
(B40) No. 10 — Chassis ground:
(B40) No. 6 — Chassis ground:
8 CHECK HARNESS/CONNECTOR
BETWEEN TCM AND DATA LINK CONNEC-
TOR.
Measure resistance between TCM connector
and data link connector.
Connector & terminal
(B56) No. 15 — (B40) No. 10:
Step
Is the voltage more than 10
V?
Is the resistance less than
1 Ω?
Are the name and year of
the system displayed on
the select monitor?
Are the name and year of
the system displayed on
the select monitor?
Are the name and year of
the system displayed on
the select monitor?
Is the resistance more than
1M Ω?
Is the voltage more than 1
V?
Is the resistance less than
0.5 Ω?
AT-38
Check Yes
Go to step 2.
Go to step 3.
Go to step 6.
Go to step 8.
Inspect ECM.
Go to step 7.
Repair harness
and connector
between each
control module
and data link con-
nector.
Go to step 9.
No
Repair harness
and connector
between battery
and data link
connector, and
poor contact in
coupling connec-
tor.
Repair open cir-
cuit in harness
between data link
connector and
ground terminal,
and poor contact
in coupling con-
nector.
Go to step 4.
Go to step 5.
Go to step 6.
Repair harness
and connector
between each
control module
and data link con-
nector.
A temporary poor
contact of the
connector or har-
ness may be the
cause. Repair
harness or con-
nector in the cir-
cuit.
Repair harness
and connector
between TCM and
data link connec-
tor.