Subaru 2002 IMPREZA Service Manual page 1650

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
9 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1)Connect the connectors to TCM and trans-
mission.
2)Connect the Subaru Select Monitor to data
link connector.
3)Turn the ignition switch to ON and turn Sub-
aru Select Monitor switch to ON.
4)Start the engine.
5)Move the select lever to "P" or "N" range.
6)Read the data of turbine speed using Subaru
Select Monitor.
•Compare the tachometer with Subaru Select
Monitor indications.
10 CHECK INPUT SIGNAL FOR TCM USING
OSCILLOSCOPE.
1)Connect the connectors to TCM and trans-
mission.
2)Set the oscilloscope to TCM connector termi-
nals.
Connector & terminal
Positive probe; (B55) No. 8
Earth lead; (B55) No. 9
3)Start the engine and move select lever to "P"
or "N" range.
11 CHECK POOR CONTACT.
Check
Is the revolution value same as
the tachometer reading shown
on the combination meter?
Is the signal voltage more than
AC 1 V?
Is there poor contact in torque
converter turbine speed sensor
circuit?
AT-64
Yes
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.
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.
Repair the poor Replace the TCM.
contact. <Ref. to AT-46,
Transmission Con-
trol Module
(TCM).>
No