Subaru Legacy 2002 Service Manual page 1844

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
2 CHECK HARNESS CONNECTOR
BETWEEN TCM AND TRANSMISSION.
Measure resistance of harness between TCM
connector and transmission ground.
Connector & terminal
(B54) No. 15 — Chassis ground:
3 CHECK LOW CLUTCH TIMING SOLENOID.
Measure resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 3 — No. 16:
4 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1) Connect connectors to TCM and transmis-
sion.
2) Turn ignition switch to ON (engine OFF).
3) Move select lever to "D" range.
4) Measure voltage between TCM connector
and chassis ground.
Connector & terminal
(B54) No. 15 (+) — Chassis ground (−):
5 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1) Hold switch to ON.
2) Measure voltage between TCM connector
and chassis ground.
Connector & terminal
(B54) No. 15 (+) — Chassis ground (−):
6 CHECK POOR CONTACT.
7 CHECK LOW CLUTCH TIMING SOLENOID
(IN TRANSMISSION).
1) Remove transmission connector from
bracket.
2) Lift-up or raise the vehicle and support with
safety stand.
NOTE:
On AWD models, raise all wheels off ground.
3) Drain automatic transmission fluid.
CAUTION:
Do not drain the automatic transmission
fluid until it cools down.
4) Remove oil pan, and disconnect connector
from low clutch timing solenoid.
5) Measure resistance between low clutch
timing solenoid connector and transmission
ground.
Terminal
No. 1 — Transmission ground:
Step
Is the resistance more than
1 MΩ?
Is the resistance between
10 and 16 Ω?
Is the voltage more than
9V?
Is the voltage less than
1V?
Is there poor contact in low
clutch timing solenoid cir-
cuit?
Is the resistance between
10 and 16 Ω?
AT-75
Automatic Transmission (Diagnostics)
Check Yes
Go to step 3.
Go to step 4.
Go to step 5.
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-
tact in the TCM
and transmission.
Repair poor con-
tact.
Go to step 8.
No
Repair short cir-
cuit in harness
between TCM and
transmission con-
nector.
Go to step 7.
Go to step 6.
Go to step 6.
Replace TCM.
<Ref. to AT-49,
Transmission
Control Module
(TCM).>
Replace low
clutch timing sole-
noid. <Ref. to
AT-42, Shift
Solenoids, Duty
Solenoids and
ATF Temperature
Sensor.>