Subaru Legacy III (2000-2003 year). Service manual — part 592
AT-102
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
P: DTC 78 SPORT SHIFT SOLENOID
DIAGNOSIS:
Output signal circuit of SPORT shift solenoid is open or shorted.
TROUBLE SYMPTOM:
Engine brake is effective at D, 3, 2, ranges.
WIRING DIAGRAM:
AT-00663
14
TRANSMISSION
B54
TCM
AT10
SPORT SHIFT
SOLENOID
B54
1 2
7
8
9
5 6
3 4
10 11 12
19 20 21
13
14 15
16
17
18
22
23
24
T4
B11
8
B11
1 2
5
6 7
8
13
14 15
16
9 10
11 12
3 4
17 18
19 20
AT-103
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
Value
Yes
No
1
CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn ignition switch to OFF.
2) Disconnect connector from TCM and trans-
mission.
3) Measure resistance of harness between
TCM and SPORT shift solenoid connector.
Connector & terminal
(B54) No. 14 — (B11) No. 8:
Is the measured value less than the speci-
fied value?
1
Ω
Repair open circuit
in harness
between TCM and
transmission con-
nector.
2
CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure resistance of harness between TCM
connector and chassis ground.
Connector & terminal
(B54) No. 14 — Chassis ground:
Does the measured value exceed the specified
value?
1 M
Ω
Repair short circuit
in harness
between TCM and
transmission con-
nector.
3
CHECK SPORT SHIFT SOLENOID.
Measure resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 8 — No. 16:
Is the measured value within the specified
range?
10 — 16
Ω
4
CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1) Connect connectors to TCM and transmis-
sion.
2) Turn ignition switch to ON (engine OFF).
3) Measure voltage between TCM connector
and chassis ground.
Connector & terminal
(B54) No. 14 (+) — Chassis ground (
−−−−
):
Does the measured value exceed the spec-
ified value?
9V
AT-104
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
5
CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1) Turn ignition switch OFF.
2) Lift-up the vehicle and place safety stand.
NOTE:
Raise all wheels off ground.
3) Start engine, and warm transmission until
ATF temperature becomes 80
°
C (176
°
F) or
more.
4) Move select lever to SPORT shift mode.
5) Increase speed up to 25 km/h (16 MPH) at
2nd.
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-22, Clear Memory
Mode.> or <Ref. to VDC-25, Clear Memory
Mode.>
6) Shift down to 1st speed, and effectively use
engine brake.
7) Measure voltage between TCM connector
and body ground when engine brake is
effective.
Connector & terminal
(B54) No. 14 (+) — Chassis ground (
−−−−
):
Is the measured value less than the speci-
fied value?
1V
Even if “POWER”
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. A tempo-
rary poor contact
of the connector or
harness may be
the cause. Repair
harness or con-
tact in the TCM.
6
CHECK POOR CONTACT.
Is there poor contact in SPORT shift solenoid
circuit?
There is poor contact.
Repair poor con-
tact.
Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
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.
3) Drain automatic transmission fluid.
CAUTION:
Do not drain the automatic transmission flu-
id until it cools down.
4) Remove oil pan, and disconnect connector
from SPORT shift solenoid.
5) Measure resistance between SPORT shift
solenoid connector and transmission
ground.
Terminal
No. 1 — Transmission ground:
Is the measured value within the specified
range?
10 — 16
Ω
Replace SPORT
shift solenoid.
<Ref. to AT-67,
Shift Solenoids,
Duty Solenoids
and ATF Temper-
ature Sensor.>
Step
Value
Yes
No
AT-105
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
8
CHECK HARNESS CONNECTOR BETWEEN
SPORT SHIFT SOLENOID AND TRANSMIS-
SION.
Measure resistance of harness between shift
solenoid 1 and transmission connector.
Connector & terminal
(AT10) No. 1 — (T4) No. 8:
Is the measured value less than the specified
value?
1
Ω
Repair open circuit
in harness
between SPORT
shift solenoid and
transmission con-
nector.
9
CHECK HARNESS CONNECTOR BETWEEN
SPORT SHIFT SOLENOID AND TRANSMIS-
SION.
Measure resistance of harness between
SPORT shift solenoid connector and transmis-
sion ground.
Connector & terminal
(T4) No. 8 — Transmission ground:
Does the measured value exceed the specified
value?
1 M
Ω
Even if “POWER”
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. A tempo-
rary poor contact
of the connector or
harness may be
the cause. Repair
harness or con-
nector in SPORT
shift solenoid and
transmission.
Repair short circuit
harness between
SPORT shift sole-
noid and transmis-
sion connector.
Step
Value
Yes
No
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