Subaru IMPREZA 2002 Service Manual page 168

I
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
~~
Step
Check
TCM.
1)Connect the connectors to TCM and trans-
mission.
2)Lift-up or raise the vehicle and support with
safety stand.
CAUTION:
On AWD models, raise all wheels off
ground.
3)Start the engine and warm-up the transmis-
sion until the ATF temperature is above 80°C
(1 76°F).
NOTE:
If the ambient temperature is below 0°C (32°F)
drive the vehicle until the ATF reaches its oper
ating temperature.
4)Move the selector lever to "D", and slowly
increase the vehicle speed to 50 km/h (31
MPH).
NOTE:
The speed difference between front and real
wheels may light the ABS warning light, but thi:
indicates no malfunction. When the AT contro
diagnosis is finished, perform the ABS memo0
clearance procedure of on-board diagnostics
system. <Ref. to ABS-22, Clear Memor)
Mode.>
5)Measure the voltage between TCM connec-
tor and chassis ground.
Connector & terminal
Non-turbo model
Turbo model
(654) No. 6 (+)
-
Chassis ground
( - ) I
(654) No. 5 (+)
-
Chassis ground (-):
CHECK POOR CONTACT.
3eoair
Door
con-
I
CHECK SHIFT SOLENOID 2 (IN TRANSMIS-
SION).
1)Remove the transmission connector from
bracket.
2)Drain the automatic transmission fluid.
CAUTION:
Do not drain the automatic transmission flu-
id until it cools down.
3)Remove the oil pan, and disconnect the con-
nector from shift solenoid 2.
4)Measure the resistance between shift sole-
noid 2 connector and transmission ground.
Connector & terminal
No.
1
-
Transmission ground:
CHECK HARNESS CONNECTOR BETWEEN
SHIFT SOLENOID 2 AND TRANSMISSION.
Measure the resistance of harness between
shift solenoid 2 and transmission connector.
Connector & terminal
(AT6) NO. 1
-
(T4) NO. 2:
denlace
the TCM
IS
there poor contact in shift
solenoid 2 circuit?
Is the resistance between 10
and 16 !2?
. . - ~
.
<Ref. to AT-45,
Transmission Con.
trol Module
(TCM).>
Replace the shift
solenoid 2 assem-
bly. <Ref. to AT-39
Shift Solenoids,
Duty Solenoids
and ATF Tempera-
ture Sensor.>
s the resistance less than
1
R?
I
CHECK OUTPUT SIGNAL EMITTED FROM
Yes
Even if the AT OIL
TEMP warning
lights up, the cir-
suit has returned
to a normal condi-
tion at this time. A
temporary poor
:ontact of the con-
lector or harness
nay be the cause.
3epair harness or
:onnector in the
TCM and trans-
nission.
I
Is the voltage less than 1 V?
No
30 to step 5.
- 3 . - I - - -
- -
act.
$0
to step 7.
in harness
between shift sole.
noid 2 and trans-
mission connector,
AT-76