Subaru Legacy 2002 Service Manual page 1832

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
3 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1) Connect connectors to TCM and ECM.
2) Turn ignition switch to ON (engine OFF).
3) Measure voltage between TCM connector
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 ground line in
transmission and body.
6 CHECK GROUND LINE BETWEEN TRANS-
MISSION AND BODY.
Check installing condition of ground line in
transmission and body.
Tightening torque:
13±3 N·m (1.3±0.3 kgf-m, 9.4±2.2 ft-lb)
7 CHECK GROUND LINE INSIDE TRANSMIS-
SION.
1) Drain AT fluid and remove oil pan.
2) Check tightening torque value of ground
line installing bolt.
Tightening torque:
T: 8±1 N·m (0.8±0.1 kgf-m, 5.8±0.7 ft-lb)
8 CHECK GROUND CIRCUIT OF ECM.
<Ref. to AT-46, DTC 31 THROTTLE POSI-
TION SENSOR, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
9 RECHECK OUTPUT SIGNAL EMITTED
FROM TCM.
Measure voltage between TCM connector and
chassis ground.
Connector & terminal
(B56) No. 14 (+) — Chassis ground (−):
(B56) No. 5 (+) — Chassis ground (−):
Step
Is the voltage more than
4.8 V?
Is there poor contact in
torque control signal cir-
cuit?
Is there any dirt or rust at
ground line installing point?
Is tightening torque value
within specification?
Is tightening torque value
within specification?
Is there any trouble?
Is each voltage more than
4.8 V?
AT-63
Automatic Transmission (Diagnostics)
Check Yes
Even if "POWER"
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. A tem-
porary poor con-
tact of the con-
nector or harness
may be the
cause. Repair
harness or con-
nector in the TCM
and ECM.
Repair poor con-
tact.
Remove dirt and
rust.
Go to step 7.
Go to step 9.
Repair ground
terminal and/or
ground circuit of
ECM.
Replace TCM.
<Ref. to AT-49,
Transmission
Control Module
(TCM).>
No
Go to step 4.
Go to step 5.
Go to step 6.
Tighten to speci-
fied torque.
Tighten to speci-
fied torque.
Go to step 9.
Replace ECM.