Subaru LEGACY 2006 Manual page 3505

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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 TCM, ECM,
TPM control unit, airbag control module, body
integrated unit, and ABSCM&H/U.
3) Measure the resistance between TCM con-
nector and chassis ground.
Connector & terminal
(B40) No. 10 — 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. 10 (+) — 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
(B55) No. 12 — (B40) No. 10:
12 CHECK INSTALLATION OF TRANSMISSION
HARNESS CONNECTOR.
13 CHECK POOR CONTACT OF CONNEC-
TORS.
14 CHECK POWER SUPPLY OF TCM.
1) Disconnect the connector from TCM.
2) Turn the ignition switch to ON.
3) Measure the voltage between TCM con-
nector and chassis ground.
Connector & terminal
(B55) No. 27 (+) — Chassis ground (–):
(B55) No. 28 (+) — Chassis ground (–):
(B55) No. 29 (+) — Chassis ground (–):
15 CHECK 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 (engine
OFF).
2) Measure the ignition power supply voltage
between TCM connector and chassis ground.
Connector & terminal
(B55) No. 21 (+) — Chassis ground (–):
(B55) No. 31 (+) — Chassis ground (–):
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the resistance more than 1
MΩ?
Is the voltage more than 1 V?
Is the resistance less than 1
Ω?
Is the transmission harness
connector connected to bulk-
head harness connector?
Is there poor contact in control
module power supply and data
link connector?
Is the voltage 10 — 13 V?
Is the fuse (No. 12) blown out? Replace the fuse
Is the voltage 10 — 13 V?
4AT(diag)-25
Yes No
Go to step 10. Check harness
and connector
between each con-
trol module and
data link connec-
tor.
Go to step 11.
Check harness
and connector
between each con-
trol module and
data link connec-
tor.
Go to step 12.
Repair the har-
ness and connec-
tor between TCM
and data link con-
nector.
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
(No. 12). If the circuit of harness
replaced fuse (No. between fuse (No.
12) has blown out 12) and TCM, or
easily, repair the fuse (No. 12) and
short circuit of har- battery, and poor
ness between fuse contact of the con-
(No. 12) and TCM. nector.
Go to step 18. Go to step 17.