Subaru 2002 IMPREZA Service Manual page 1649

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK TORQUE CONVERTER TURBINE
SPEED SENSOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from transmission.
3)Measure the resistance between transmis-
sion connector receptacle's terminals.
Connector & terminal
(T4) No. 14 — No. 15:
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1)Disconnect the connector from TCM.
2)Measure the 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 the 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 the resistance of harness between
TCM and chassis ground.
Connector & terminal
(B55) No. 9 — Chassis ground:
5 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the 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 the connectors to TCM and trans-
mission.
2)Start the engine and move select lever to "P"
or "N" range.
3)Measure the voltage between TCM connec-
tor terminals.
Connector & terminal
(B55) No. 8 (+) — No. 9 ( − − − − ):
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
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 an oscilloscope? Go to step 10.
Do you have a Subaru Select
Monitor?
Is the voltage more than AC 1
V?
AT-63
Yes
Go to step 2. Replace the tur-
bine speed sen-
sor. <Ref. to AT-
37, Torque Con-
verter Turbine
Speed Sensor.>
Go to step 3. Repair the open
circuit in harness
between TCM and
transmission con-
nector.
Go to step 4. Repair the open
circuit in harness
between TCM and
transmission con-
nector, and poor
contact in cou-
pling connector.
Go to step 5. Repair the short
circuit in harness
between TCM and
transmission con-
nector.
Go to step 6. Repair the short
circuit in harness
between TCM and
transmission con-
nector, and poor
contact in cou-
pling connector.
Go to step 7.
Go to step 9. Go to step 8.
Even if the Go to step 11.
POWER indicator
lights up, the cir-
cuit has returned
to a normal condi-
tion at this time. A
temporary poor
contact of the con-
nector or harness
may be the cause.
Repair the har-
ness or connector
in TCM and trans-
mission.
No