Subaru Legacy 2002 Service Manual page 1836

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
2 CHECK HARNESS CONNECTOR
BETWEEN TCM AND TRANSMISSION.
Measure resistance of harness between TCM
connector and chassis ground.
Connector & terminal
(B54) No. 22 — Chassis ground:
3 CHECK SHIFT SOLENOID 1.
Measure resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 1 — 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. 22 (+) — 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. 22 (+) — Chassis ground (−):
6 CHECK POOR CONTACT.
7 CHECK SHIFT SOLENOID 1 (IN TRANSMIS-
SION).
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 shift solenoid 1.
5) Measure resistance between shift solenoid
1 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
shift solenoid 1 circuit?
Is the resistance between
10 and 16 Ω?
AT-67
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.
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 shift
solenoid 1. <Ref.
to AT-49, Trans-
mission Control
Module (TCM).>