Subaru IMPREZA 2002 Service Manual page 159

I
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
CHECK HARNESS CONNECTOR BETWEEN
TCM AND ECM.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
Non-turbo model
(B56) No. 21
-
Chassis ground:
(854)
No. 13
-
Chassis ground:
(B56) No. 14
-
Chassis ground:
(B56) No. 5
-
Chassis ground:
CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1)Connect the connectors to TCM and ECM.
2)Turn the ignition switch to ON (engine OFF).
3)Measure the voltage between TCM connec-
tor terminals.
Turbo model
Connector & terminal
Non-turbo model
(B54) No. 21 (+)
-
Chassis ground ( - ) :
(B54) No.
13
(+)
-
Chassis ground ( - ) :
(B56)
No.
14 (+)
-
Chassis ground (-):
(B56) No. 5 (+)
-
Chassis ground (-):
Turbo model
I CHECK POOR CONTACT.
1
CHECK GROUND LINE BETWEEN TRANS-
MISSION AND BODY.
Check the installing condition of ground line in
transmission and body.
MISSION AND BODY.
Check the installing condition of ground line in
transmission and body.
Tightening torque:
i
CHECK GROUND LINE BETWEEN TRANS-
13f3 N.m (1.3i0.3 kgf-m, 9.4i9.2 ft-lb)
,
CHECK GROUND LINE INSIDE TRANSMIS-
SION.
1)Drain the AT fluid and remove the oil pan.
2)Check the tightening torque value of ground
line installing bolt.
Tightening torque:
T:
Bfl N-m
(O.BiO.l
kgf-m,
5.8i0.7
ft-lb)
CHECK GROUND CIRCUIT OF ECM.
<Ref. to AT-52, DTC 31 THROTTLE POSITION
SENSOR, Diagnostic Procedure with Diagnos,
tic Trouble Code (DTC).>
FROM TCM.
Measure the voltage between TCM connector
and chassis ground.
I
1
RECHECK OUTPUT SIGNAL EMITTED
Connector & terminal
Non-turbo model
(B54) No. 21 (+)
-
Chassis ground ( - ) :
(B54) No.
13
(+)
-
Chassis ground (-):
(B56) No. 14 (+)
-
Chassis ground (-):
(B56)
No.
5 (+)
-
Chassis ground ( - ) :
Turbo model
Check
s the resistance more than 1
A n ?
s the voltage more than 4.8 V'
s
there poor contact in torque
:ontrol signal circuit?
s there any dirt or rust at
lround line installing point?
s the tightening torque value
vithin specification?
s
the tightening torque value
vithin specification?
s there any trouble?
s each voltage more than 4.8
I?
Yes
Go to step 3.
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 ECM.
Repair poor con-
tact.
Remove dirt and
rust.
Go to step 7.
Go to step 9.
Repair ground ter-
minal and/or
ground circuit of
ECM.
Replace the TCM.
<Ref. to AT-45,
Transmission Con-
trol Module
(TCM).>
No
3epair short circuit
I
harness
ietween TCM and
ICM connector.
; o to step 4.
;o to step 5.
;o
to step 6.
7ghten to speci-
ied torque.
7ghten to speci-
ied torque.
So to step 9.
3eplace the ECM.
AT-67