Subaru IMPREZA 2002 Service Manual page 156

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
I
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
s the voltage more than AC 1
I?
s the revolution value same as
he tachometer reading shown
In the combination meter?
s the signal voltage more than
4 c
1 V?
s there poor contact in torque
:onverter turbine speed sensor
:ircuit?
Step
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.
8
Connector & terminal
Non-turbo model
Turbo model
(855) NO. 12 (+)
-
NO. 21 ( - ) :
(855) NO. 8 (+)
-
NO. 9 (-):
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 the
Subaru 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.
CHECK INPUT SIGNAL FOR TCM USING
OSCILLOSCOPE.
1)Connect the connectors to TCM and trans-
mission.
2)Set the oscilloscope to TCM connector ter-
minals.
Turbo model
Positive probe; (B55) No. 8
Earth lead; (B55) No. 9
Non-turbo model
Positive probe; (B55) No. 12
Earth lead; (B55) No. 21
3)Start the engine and move the select lever to
"P" or "N" range.
11 CHECK POOR CONTACT.
r .
-
10
Yes
Even if the AT OIL
TEMP warning
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 harness or
connector in the
TCM and trans-
mission.
Even if the AT OIL
TEMP warning
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 harness or
connector in the
TCM and trans-
mission.
Even if the AT OIL
TEMP warning
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 harness or
connector in the
TCM and trans-
mission.
Repair poor con-
tact.
I
I
f
2 0
to stc
2 0
to ste
30 to stt
z $ 5 E G
:Ref. to
rransmi:
rol Modi
TCM).>
AT-64