Subaru IMPREZA 2002 Service Manual page 152

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
I
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
CHECK INPUT SIGNAL FOR TCM.
1)Connect all connectors.
2)Lift-up or raise the vehicle and place safety
stands.
CAUTION:
On AWD models, raise all wheels off floor.
3)Start the engine and set the vehicle in 20 km
h (12 MPH) condition.
NOTE:
The speed difference between front and real
wheels may light the ABS warning light, but thk
indicates no malfunction. When the AT contro
diagnosis is finished, perform the ABS memorq
clearance procedure of on-board diagnostic5
system. <Ref. to ABS-22, Clear Memor)
Mode.>
4)Measure the voltage between TCM connec-
tor terminals.
Connector
& i
terminal
Non-turbo model
Turbo model
(655) NO. 5 (+)
-
(654) NO. 21 (-):
(655) NO. 18 (+)
-
(654) NO. 10 ( - ) :
CHECK FRONT VEHICLE SPEED SENSOR
USING OSCILLOSCOPE.
1)Connect all connectors.
2)Lift-up the vehicle and place safety stands.
CAUTION:
On AWD models, raise all wheels off
ground.
3)Set the oscilloscope to TCM connector ter-
minals.
Non-turbo model
Positive probe; (855) No. 18
Earth lead; (B54) No. 10
Turbo model
Positive probe; (855) No. 5
Earth lead; (854) No. 21
4)Start the engine, and drive the wheels slowly,
NOTE:
The speed difference between front and real
wheels may light the ABS warning light, but this
indicates no malfunctions. When the AT control
diagnosis is finished, perform the ABS memory
clearance procedure of self-diagnosis system.
<Ref. to ABS-22, Clear Memory Mode.>
5)Measure the signal voltage indicated on
oscilloscope.
Check
Is the voltage more than AC
1
V?
s the voltage more than AC 4
J?
Yes
%en if the AT OIL
rEMP warning
ights up, the cir-
:uit has returned
o a normal condi-
ion at this time. A
emporary poor
:ontactor or har-
less may be the
:ase. Repair har-
less or connector
n the front vehicle
;peed sensor cir-
:uit.
h e n if the AT OIL
rEMP warning
ights up, the cir-
:uit has returned
o a normal condi-
ion at this time. A
emporary poor
:ontactor or har-
less may be the
:ase. Repair har-
less or connector
I
the front vehicle
;peed sensor cir-
:uit.
No
2 0
to step 11.
; o to step 11.
AT-60