Subaru 2002 IMPREZA Service Manual page 1653

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
3 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.
Connector & terminal
(B56) No. 14 (+) — Chassis ground ( − − − − ):
(B56) No. 5 (+) — Chassis ground ( − − − − ):
4 CHECK POOR CONTACT.
5 CHECK GROUND LINE BETWEEN TRANS-
MISSION AND BODY.
Check installing condition of the ground line in
transmission and body.
6 CHECK GROUND LINE BETWEEN TRANS-
MISSION AND BODY.
Check installing condition of the ground line in
transmission and body.
Tightening torque:
13 N·m (1.3 kgf-m, 9.4 ft-lb)
7 CHECK GROUND LINE INSIDE TRANSMIS-
SION.
1)Drain the ATF and remove oil pan.
2)Check the tightening torque value of ground
line installing bolt.
Tightening torque:
T: 8 N·m (0.8 kgf-m, 5.8 ft-lb)
8 CHECK GROUND CIRCUIT OF ECM.
<Ref. to AT-50, DTC 31 THROTTLE POSI-
TION SENSOR, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
9 RECHECK OUTPUT SIGNAL EMITTED
FROM TCM.
Measure the voltage between TCM connector
and chassis ground.
Connector & terminal
(B56) No. 14 (+) — Chassis ground ( − − − − ):
(B56) No. 5 (+) — Chassis ground ( − − − − ):
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the voltage more than 4.8 V? Even if the
Is there poor contact in torque
control signal circuit?
Is there any dirt or rust at the
ground line installing point?
Is the tightening torque value
within specification?
Is the tightening torque value
within specification?
Is there any trouble?
Is each voltage more than 4 V? Replace the TCM.
AT-67
Yes
Go to step 4.
POWER indicator
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 the har-
ness or connector
in TCM and ECM.
Repair the poor Go to step 5.
contact.
Remove dirt and Go to step 6.
rust.
Go to step 7. Tighten to the
specified torque.
Go to step 9. Tighten to the
specified torque.
Repair the ground Go to step 9.
terminal and/or
ground circuit of
ECM.
Replace the ECM.
<Ref. to AT-46,
Transmission Con-
trol Module
(TCM).>
No