Subaru 2006 Legacy, Manual

Page: 3449 / 4302

4AT(diag)-63
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
4 CHECK OUTPUT SIGNAL FROM TCM US-
ING SUBARU SELECT MONITOR.
1) Connect all connectors.
2) Connect the Subaru Select Monitor to the
data link connector.
3) Start the engine, and turn the Subaru
Select Monitor power switch ON.
4) Warm-up the transmission until the ATF
temperature reaches approximately 80°C
(176°F).
NOTE:
If the ambient temperature falls below 0°C
(32°F), drive the vehicle until the ATF reaches
its operating temperature.
5) Stop the engine and turn the ignition switch
to ON (with engine OFF).
6) Shift the select lever to “N” range, and
depress the accelerator pedal.
7) Read the data of “Brake Clutch Duty
Ration” using Subaru Select Monitor.
2-4 brake duty solenoid is indicated in “%.”
Is the measured value 100%? Go to step
5
. Go to step
6
.
5 CHECK OUTPUT SIGNAL FROM TCM US-
ING SUBARU SELECT MONITOR.
Shift the select lever to 2nd on manual mode.
Is the measured value 0%? Even if the SPORT
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. Go to step 6 .
6 CHECK POOR CONTACT. Is there poor contact in 2-4
brake duty solenoid circuit? Repair the poor
contact. Replace the TCM.
<Ref. to 4AT-62,
Transmission Con-
trol Module
(TCM).>
7 CHECK 2-4 BRAKE DUTY SOLENOID (IN
TRANSMISSION).
1) Remove the transmission connector from
bracket.
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 2-4 brake duty solenoid.
4) Measure the resistance of harness
between 2-4 brake duty solenoid connector
and transmission ground.
Connector & terminal
(AT3) No. 6 — Transmission ground:
Is the resistance between 2.0
— 6.0
Ω
?
Go to step 8 . Replace the con-
trol valve body.
<Ref. to 4AT-57,
Control Valve
Body.>
Step Check Yes No
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