4AT(diag)-27
Diagnostic Procedure for Subaru Select Monitor Communication
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
9
CHECK HARNESS CONNECTOR BETWEEN
EACH CONTROL MODULE AND DATA LINK
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors of all control
modules connected to the data link connector
(B40) No. 7.
3) Measure the resistance between TCM con-
nector and chassis ground.
Connector & terminal
(B40) No. 7 — Chassis ground:
Is the resistance 1 M
:
or
more?
Go to step
10
.
Check harness
and connector
between each con-
trol module and
data link connec-
tor.
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. 7 (+) — Chassis ground (–):
Is the voltage 1 V or more?
Check harness
and connector
between each con-
trol module and
data link connec-
tor.
Go to step
11
.
11
CHECK HARNESS CONNECTOR BETWEEN
TCM AND DATA LINK CONNECTOR.
Measure the resistance between TCM connec-
tor and data link connector.
Connector & terminal
(B40) No. 7 — (B54) No. 8:
Is the resistance less than 1
:
? Go to step
12
.
Check the harness
and connector
between TCM and
data link connec-
tor.
12
CHECK INSTALLATION OF TRANSMISSION
HARNESS CONNECTOR.
Is the transmission harness
connector connected to bulk-
head harness connector?
Go to step
13
.
Connect the bulk-
head harness con-
nector to
transmission har-
ness connector.
13
CHECK POOR CONTACT OF CONNEC-
TORS.
Is there poor contact of control
module power supply and data
link connector?
Repair the poor
contact.
Go to step
14
.
14
CHECK TCM POWER SUPPLY.
1) Disconnect the connector from TCM.
2) Turn the ignition switch to ON.
3) Measure the voltage between TCM connec-
tor and chassis ground.
Connector & terminal
(B54) No. 25 (+) — Chassis ground (–):
(B54) No. 26 (+) — Chassis ground (–):
(B54) No. 27 (+) — Chassis ground (–):
Is the voltage 10 — 13 V?
Go to step
16
.
Go to step
15
.
15
CHECK M/B FUSE (NO. 12).
1) Turn the ignition switch to OFF.
2) Remove the fuse (No. 12).
Is the fuse (No. 12) blown out? Replace the fuse. If
the replaced fuse
has blown out eas-
ily, repair short cir-
cuit of harness
between fuse and
TCM.
Repair the open
circuit of harness
between fuse and
TCM, or fuse and
battery, and poor
contact of the con-
nector.
16
CHECK IGNITION POWER SUPPLY CIR-
CUIT.
1) Turn the ignition switch to ON.
2) Measure the ignition power supply voltage
between TCM connector and chassis ground.
Connector & terminal
(B54) No. 1 (+) — Chassis ground (–):
(B54) No. 2 (+) — Chassis ground (–):
Is the voltage 10 — 13 V?
Go to step
18
.
Go to step
17
.
Step
Check
Yes
No
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