Subaru Legacy 2004 Service Manual page 2578

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
10 CHECK INPUT SIGNAL FOR TCM USING
CIRCUIT TESTER.
1) Connect all the connectors.
2) Lift-up the vehicle and support with rigid
racks.
NOTE:
Raise all wheels off floor.
3) Start the engine, and set the vehicle in 1st
speed driving condition of manual mode.
4) Measure the voltage between TCM termi-
nals.
Connector & terminal
(B55) No. 22 (+) — (B54) No. 19 (
5) Stop the vehicle, and shift the select lever
to "P" range.
6) Measure the voltage between TCM termi-
nals.
Connector & terminal
(B55) No. 22 (+) — (B54) No. 19 (
NOTE:
The speed difference between front and rear
wheels may light the ABS warning light, but this
indicates no malfunction. When AT control di-
agnosis is finished, perform the ABS memory
clearance procedure of on-board diagnostics
system. <Ref. to ABS(diag)-27, Clear Memory
Mode.>
11 CHECK HARNESS CONNECTOR BETWEEN
TRANSMISSION AND CONTROL VALVE
BODY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from transmis-
sion.
3) Remove the transmission connector from
bracket.
4) Lift-up the vehicle and place it on rigid
racks.
NOTE:
Raise all wheels off floor.
5) Drain the ATF.
CAUTION:
Do not drain the ATF until it cools down.
6) Remove the oil pan, and disconnect the
connector from control valve body connector.
7) Measure the resistance between transmis-
sion connector and control valve body connec-
tor.
Connector & terminal
(T3) No. 6 — (T6) No. 3:
(T4) No. 7 — (T5) No. 15:
12 CHECK HARNESS CONNECTOR BETWEEN
TRANSMISSION AND CONTROL VALVE
BODY.
Measure the resistance between transmission
ground and control valve body connector.
Connector & terminal
(T6) No. 3 — Transmission ground:
(T5) No. 15 — Transmission ground:
Check
Does the voltage change
within the range of 2 — 3 V
when vehicle is driving? Is the
voltage less than 0.5 V or more
than 4.5 V constantly when the
vehicle is parked with "P"
range?
$
):
$
):
Is the resistance less than 1
"?
Is the resistance more than 1
M"?
5AT(diag)-119
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Yes
Even if the SPORT
indicator lights
blinks, the system
is in normal condi-
tion.
A temporary poor
contact of connec-
tor or harness may
be the cause.
Repair the poor
contact in harness
of turbine speed
sensor 2 and
transmission con-
nector.
Go to step 12.
Replace the con-
trol valve body.
<Ref. to 5AT-58,
Control Valve
Body.>
No
Go to step 11.
Repair the open
circuit in harness
between control
valve body con-
nector and trans-
mission connector.
Repair the short
circuit in harness
between transmis-
sion connector
and transmission
ground.