Subaru Legacy 2002 Service Manual page 1829

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Automatic Transmission (Diagnostics)
No.
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.
¼ Compare tachometer with Subaru Select
Monitor indications.
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.
11 CHECK POOR CONTACT.
Step
Is the revolution value
same as the tachometer
reading shown on the com-
bination meter?
Is the signal voltage more
than AC 1 V?
Is there poor contact in
torque converter turbine
speed sensor circuit?
AT-60
Check Yes
Even if "POWER"
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. A tem-
porary poor con-
tact of the con-
nector or harness
may be the
cause. Repair
harness or con-
nector in the TCM
and transmission.
Even if "POWER"
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. A tem-
porary poor con-
tact of the con-
nector or harness
may be the
cause. Repair
harness or con-
nector in the TCM
and transmission.
Repair poor con-
tact.
No
Go to step 11.
Go to step 11.
Replace TCM.
<Ref. to AT-49,
Transmission
Control Module
(TCM).>