Subaru 2003 LEGACY Service Manual page 68

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
8 CHECK INPUT SIGNAL FOR TCM.
1) Connect connectors to TCM and transmis-
sion.
2) Start the engine and move select lever to
"P" or "N" range.
3) Measure voltage between TCM connector
terminals.
Connector & terminal
(B55) No. 8 (+) — No. 9 ( − − − − ):
Does the measured value exceed the spec-
ified value?
9 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Connect connectors to TCM and transmis-
sion.
2) Connect Subaru Select Monitor to data link
connector.
3) Turn ignition switch to ON and turn Subaru
Select Monitor switch to ON.
4) Start the engine.
5) Move select lever to "P" or "N" range.
6) Read data of turbine speed using Subaru
Select Monitor.
•Compare tachometer with Subaru Select
Monitor indications.
Is the revolution value same as the tachom-
eter reading shown on the combination
meter?
10 CHECK INPUT SIGNAL FOR TCM USING
OSCILLOSCOPE.
1) Connect connectors to TCM and transmis-
sion.
2) Set oscilloscope to TCM connector termi-
nals.
Connector & terminal
Positive probe; (B55) No. 8
Ground; (B55) No. 9
3) Start the engine and move select lever to
"P" or "N" range.
Does the measured value exceed the spec-
ified value?
11 CHECK POOR CONTACT.
Is there poor contact in torque converter tur-
bine speed sensor circuit?
Step Value
AC 1 V
Same as tachometer value.
AC 1 V
There is poor contact.
AT-66
Yes
Even if "POWER" Go to step 11.
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. A tempo-
rary poor contact
of the connector or
harness may be
the cause. Repair
harness or con-
nector in the TCM
and transmission.
Even if "POWER" Go to step 11.
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. A tempo-
rary poor contact
of the connector or
harness may be
the cause. Repair
harness or con-
nector in the TCM
and transmission.
Even if "POWER" Go to step 11.
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. A tempo-
rary poor contact
of the connector or
harness may be
the cause. Repair
harness or con-
nector in the TCM
and transmission.
Repair poor con- Replace TCM.
tact. <Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
No