Subaru 2002 IMPREZA Service Manual page 1625

DIAGNOSTIC PROCEDURE FOR SELECT MONITOR COMMUNICATION
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 SELECT
MONITOR.
1)Turn the ignition switch to ON.
2)Using the Subaru Select Monitor, check
whether communication to engine systems can
be executed normally.
4 CHECK COMMUNICATION OF SELECT
MONITOR.
1)Turn the ignition switch to OFF.
2)Disconnect the TCM connector.
3)Check whether communication to engine
systems can be executed normally.
5 CHECK COMMUNICATION OF SELECT
MONITOR.
1)Turn the ignition switch to OFF.
2)Connect the TCM connector.
3)Disconnect the 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 the ignition switch to OFF.
2)Disconnect the TCM, ECM, ABSCM&H/U,
cruise control module and immobilizer control
module connectors.
3)Measure the resistance between TCM 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 the ignition switch to ON.
2)Measure the voltage between TCM and
chassis ground.
Connector & terminal
(B40) No. 10 (+) — Chassis ground ( − − − − ):
(B40) No. 6 (+) — 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
(B56) No. 15 — (B40) No. 10:
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the voltage more than 10V? Go to step 2.
Is the resistance less than 1Ω? Go to step 3.
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 1M
Ω?
Is the voltage more than 1 V?
Is the resistance less than 0.5
Ω?
AT-39
Yes
Repair the har-
ness and connec-
tor between
battery and data
link connector, and
poor contact in
coupling connec-
tor.
Repair the open
circuit in harness
between data link
connector and
ground terminal,
and poor contact
in coupling con-
nector.
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. Repair the har-
ness and connec-
tor between each
control module
and data link con-
nector.
Repair the har- Go to step 8.
ness and connec-
tor between each
control module
and data link con-
nector.
Go to step 9. Repair the har-
ness and connec-
tor between TCM
and data link con-
nector.
No