Subaru IMPREZA 2002 Service Manual page 176

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
I
Step Check
I
CHECK 2-4 BRAKE TIMING SOLENOID (IN
I
Is the resistance between 10
1
CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1)Move the select lever to "D", and slowly
increase vehicle speed to 65 km/h (40 MPH).
NOTE:
The speed difference between front and rear
wheels may light the ABS warning light, but this
indicates no malfunction. When the AT control
diagnosis is finished, perform the ABS memory
clearance procedure of on-board diagnostics
system. <Ref. to ABS-22, Clear Memory
Mode.>
2)Measure the voltage between TCM connec-
tor and chassis ground.
Connector & terminal
Non-turbo model
Turbo model
(854) No. 5 (+)
-
Chassis ground ( - ) :
(B54) No. 16 (+)
-
Chassis ground ( - ) :
TRANSMISSION).
1)Remove the transmission connector from
bracket.
2)Lift-up or raise the vehicle and support with
safety stands.
CAUTION:
On AWD models, raise all wheels off
ground.
3)Drain the automatic transmission fluid.
CAUTION:
Do not drain the automatic transmission flu,
id until it cools down.
I
Is the voltage more than 9 V?
and 16 R?
I
CHECK POOR CONTACT. Is there poor contact in 2-4
brake timing solenoid circuit?
Yes
Zven if the AT OIL
rEMP warning
ights up, the cir-
:uit has returned
o a normal condi-
ion at this time. A
emporary poor
:ontact of the con-
lector or harness
nay be the cause.
qepair harness or
:ontact in the
ransmission.
3epair poor con-
act.
30 to step 8.
No
30 to step
6 .
Replace the TCM.
<Ref. to AT-45,
Transmission Con.
trol Module
(TC M). >
Replace the 2-4
brake timing sole-
noid. <Ref. to AT-
'20 ChiH Crrln.
4)Remove the oil pan,.and disconnect the con-
nector from 2-4 brake timing solenoid.
5)Measure the resistance between 2-4 brake
timing solenoid connector and transmission
ground.
Terminal
No. 1
-
Transmission ground:
I
CHECK HARNESS CONNECTOR BETWEEN
2-4 BRAKE TIMING SOLENOID AND
TRANSMISSION.
Measure the resistance of harness between 2-
4 brake timing solenoid and transmission con-
nector.
Connector & terminal
(AT8) NO.
1
-
(T4) NO. 4:
noids, Duty Sole-
noids and ATF
Temperature Sen-
sor.>
Is the resistance less than 1
R?
I
30
to step 9.
Repair open circuit
in harness
between 2-4 brake
timing solenoid
and transmission
connector.
AT-84