Subaru 2002 IMPREZA Service Manual page 1669

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of harness between
TCM connector and transmission ground.
Connector & terminal
(B54) No. 16 — Transmission ground:
3 CHECK 2-4 BRAKE TIMING SOLENOID.
Measure the resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 4 — No. 16:
4 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1)Connect the connectors to TCM and trans-
mission.
2)Lift-up or raise the vehicle and support with
safety stand.
NOTE:
On AWD models, raise all wheels off ground.
3)Start the engine and warm-up the transmis-
sion until ATF temperature is above 80°C
(176°F).
NOTE:
If ambient temperature is below 0°C (32°F),
drive the vehicle until ATF reaches its operating
temperature.
4)Move the selector lever to "1" range, and
slowly increase vehicle speed to 10 km/h (6
MPH).
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.>
5)Measure the voltage between TCM connec-
tor and chassis ground.
Connector & terminal
(B54) No. 16 (+) — Chassis ground ( − − − − ):
5 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1)Move the selector lever to "D" range, and
slowly increase vehicle speed to 65 km/h (40
MPH).
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.>
2)Measure the voltage between TCM connec-
tor and chassis ground.
Connector & terminal
(B54) No. 16 (+) — Chassis ground ( − − − − ):
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the resistance more than 1
MΩ?
Is the resistance between 10
and 16 Ω?
Is the voltage less than 1 V?
Is the voltage more than 9 V?
AT-83
Yes
Go to step 3. Repair the short
circuit in harness
between TCM and
transmission con-
nector.
Go to step 4. Go to step 7.
Go to step 5. Go to step 6.
Even if the Go to step 6.
POWER indicator
lights up, the cir-
cuit has returned
to a normal condi-
tion at this time. A
temporary poor
contact of the con-
nector or harness
may be the cause.
Repair the har-
ness or contact in
transmission.
No