Subaru Legacy 2002 Service Manual page 1823

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Automatic Transmission (Diagnostics)
No.
1 CHECK HARNESS CONNECTOR
BETWEEN TCM AND TRANSMISSION.
1) Turn ignition switch to OFF.
2) Disconnect connector from TCM and trans-
mission.
3) Measure resistance of harness between
TCM and transmission connector.
Connector & terminal
(B55) No. 18 — (B11) No. 17:
2 CHECK HARNESS CONNECTOR
BETWEEN TCM AND TRANSMISSION.
Measure resistance of harness between TCM
and transmission connector.
Connector & terminal
(B54) No. 10 — (B11) No. 18:
3 CHECK HARNESS CONNECTOR
BETWEEN TCM AND TRANSMISSION.
Measure resistance of harness between TCM
and transmission connector.
Connector & terminal
(B54) No. 10 — Chassis ground:
4 CHECK HARNESS CONNECTOR
BETWEEN TCM AND TRANSMISSION.
Measure resistance of harness between TCM
and transmission connector.
Connector & terminal
(B55) No. 18 — Chassis ground:
5 CHECK FRONT VEHICLE SPEED SENSOR.
Measure resistance between transmission
connector receptacle's terminals.
Connector & terminal
(T4) No. 17 — No. 18:
6 PREPARE OSCILLOSCOPE.
7 PREPARE SUBARU SELECT MONITOR.
Step
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?
Is the resistance between
450 and 650 Ω?
Do you have oscilloscope?
Do you have a Subaru
Select Monitor?
AT-54
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 9.
Go to step 10.
No
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.
Replace front
vehicle speed
sensor. <Ref. to
AT-33, Front
Vehicle Speed
Sensor.>
Go to step 7.
Go to step 8.