Subaru Legacy 2002 Service Manual page 1828

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
1 CHECK TORQUE CONVERTER TURBINE
SPEED SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from transmission.
3) Measure resistance between transmission
connector receptacle's terminals.
Connector & terminal
(T4) No. 14 — No. 15:
2 CHECK HARNESS CONNECTOR
BETWEEN TCM AND TRANSMISSION.
1) Disconnect connector from TCM.
2) Measure resistance of harness between
TCM and transmission connector.
Connector & terminal
(B55) No. 8 — (B11) No. 14:
3 CHECK HARNESS CONNECTOR
BETWEEN TCM AND TRANSMISSION.
Measure resistance of harness between TCM
and transmission connector.
Connector & terminal
(B55) No. 9 — (B11) No. 15:
4 CHECK HARNESS CONNECTOR
BETWEEN TCM AND TRANSMISSION.
Measure resistance of harness between TCM
and chassis ground.
Connector & terminal
(B55) No. 9 — Chassis ground:
5 CHECK HARNESS CONNECTOR
BETWEEN TCM AND TRANSMISSION.
Measure resistance of harness between TCM
and chassis ground.
Connector & terminal
(B55) No. 8 — Chassis ground:
6 PREPARE OSCILLOSCOPE.
7 PREPARE SUBARU SELECT MONITOR.
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 (−):
Step
Is the resistance between
450 and 650 Ω?
Is the resistance less than
1 Ω?
Is the resistance less than
1 Ω?
Is the resistance more than
1 MΩ?
Is the resistance more than
1 MΩ?
Do you have oscilloscope?
Do you have a Subaru
Select Monitor?
Is the voltage more than
AC 1 V?
AT-59
Automatic Transmission (Diagnostics)
Check Yes
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
Go to step 10.
Go to step 9.
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.
No
Replace turbine
speed sensor.
<Ref. to AT-38,
Torque Converter
Turbine Speed
Sensor.>
Repair open cir-
cuit in harness
between TCM and
transmission con-
nector.
Repair open cir-
cuit in harness
between TCM and
transmission
connector, and
poor contact in
coupling connec-
tor.
Repair short cir-
cuit in harness
between TCM and
transmission con-
nector.
Repair short cir-
cuit in harness
between TCM and
transmission
connector, and
poor contact in
coupling connec-
tor.
Go to step 7.
Go to step 8.
Go to step 11.