Subaru LEGACY 2006 Manual page 3620

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Diagnostic Procedure for Subaru Select Monitor Communication
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
10 CHECK INSTALLATION OF TRANSMISSION
HARNESS CONNECTOR.
11 CHECK POOR CONTACT OF CONNEC-
TORS.
12 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
(B54) No. 1 (+) — Chassis ground (–):
13 CHECK FUSE (NO. 12).
1) Turn the ignition switch to OFF.
2) Remove the fuse (No. 12).
14 CHECK HARNESS.
Measure the resistance between TCM connec-
tor and chassis ground.
Connector & terminal
(B54) No. 1 — Chassis ground:
15 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. 1 (+) — Chassis ground (–):
(B55) No. 10 (+) — Chassis ground (–):
16 CHECK FUSE (NO. 12).
Remove the fuse (No. 12).
17 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from TCM.
3) Measure the resistance of the harness
between TCM and transmission ground.
Connector & terminal
(B54) No. 19 — Transmission ground:
(B55) No. 21 — Transmission ground:
(B54) No. 5 — Transmission ground:
(B54) No. 14 — Transmission ground:
CHECK POOR CONTACT OF CONNEC-
18
TORS.
Check
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 resistance less than 10
Ω?
Is the voltage 10 — 13 V?
Is the fuse (No. 12) blown out? Replace the fuse
Is the resistance more than 1
MΩ?
Is there poor contact in TCM
power supply, ground and data
link connector?
5AT(diag)-28
Yes No
Go to step 11. Connect the bulk-
head harness con-
nector to
transmission har-
ness connector.
Go to step 12.
Repair the poor
contact.
Go to step 15. Go to step 13.
Go to step 14.
(No. 12).
Replace the fuse Go to step 15.
(No. 12). If the new
fuse (No. 12) has
blown out easily,
repair the short cir-
cuit of harness
between fuse (No.
12) and TCM.
Go to step 17. Go to step 16.
Go to step 17.
(No. 12). If the
replaced fuse (No.
12) blows out eas-
ily, repair the short
circuit of harness
between fuse (No.
12) and TCM.
Go to step 18.
Repair the short
circuit of harness
between TCM and
transmission har-
ness connector,
and poor contact
of connector.
Repair the con- Replace the TCM.
nector. <Ref. to 5AT-56,
Transmission Con-
trol Module
(TCM).>