Subaru LEGACY 2006 Manual page 3442

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
6 CHECK OUTPUT SIGNAL FROM TCM US-
ING SUBARU SELECT MONITOR.
Return the engine to idling speed, shift the
select lever to "N" range and read the data.
NOTE:
The speed difference between front and rear
wheels may light the ABS warning light, but this
does not indicate a malfunction. When AT con-
trol diagnosis is finished, perform the ABS
memory clearance procedure of on-board diag-
nostics system. <Ref. to ABS(diag)-25, Clear
Memory Mode.>
7 CHECK POOR CONTACT.
8 CHECK LOCK-UP DUTY SOLENOID (IN
TRANSMISSION).
1) Disconnect the transmission connector.
2) Drain the automatic transmission fluid.
CAUTION:
Do not drain ATF until it cools down.
3) Remove the oil pan, and disconnect the
connector from control valve body.
4) Measure the resistance between lock-up
duty solenoid and transmission ground.
Connector & terminal
(AT12) No. 4 — Transmission ground:
9 CHECK HARNESS CONNECTOR BETWEEN
LOCK-UP DUTY SOLENOID AND TRANS-
MISSION.
Measure the resistance of harness between
lock-up duty solenoid and transmission con-
nector.
Connector & terminal
(T4) No. 12 — (AT12) No. 4:
10 CHECK HARNESS CONNECTOR BETWEEN
LOCK-UP DUTY SOLENOID AND TRANS-
MISSION.
Measure the resistance of harness between
transmission connector and transmission
ground.
Connector & terminal
(T4) No. 12 — Transmission ground:
Check
Is the measured value 5%?
Is there poor contact in lock-up
duty solenoid circuit?
Is the resistance between 2.0
— 6.0 Ω?
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
4AT(diag)-56
Yes No
Even if the SPORT Go to step 7.
indicator light is
blinking, the cir-
cuit is in normal
condition at this
time. A temporary
poor contact of
connector or har-
ness may be the
cause. Repair the
harness or con-
nector in TCM and
transmission.
Repair the poor Replace the TCM.
contact. <Ref. to 4AT-62,
Transmission Con-
trol Module
(TCM).>
Go to step 9. Replace the con-
trol valve body.
<Ref. to 4AT-57,
Control Valve
Body.>
Go to step 10.
Repair the open
circuit of harness
between TCM and
transmission con-
nector.
Even if the SPORT Repair the short
indicator light is circuit of harness
blinking, the cir- between lock-up
cuit is in normal duty solenoid and
condition at this transmission con-
time. A temporary nector.
poor contact of
connector or har-
ness may be the
cause. Repair the
harness or con-
nector in lock-up
duty solenoid and
transmission.