Subaru 2002 IMPREZA Service Manual page 1661

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. 5 — Chassis ground:
3 CHECK SHIFT SOLENOID 2.
Measure the resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 2 — 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 "D" range, and
slowly increase vehicle speed to 50 km/h (31
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. 22 (+) — Chassis ground ( − − − − ):
5 CHECK POOR CONTACT.
6 CHECK SHIFT SOLENOID 2 (IN TRANSMIS-
SION).
1)Remove the transmission connector from
bracket.
2)Drain the ATF.
CAUTION:
Do not drain the ATF until it cools down.
3)Remove the oil pan, and disconnect connec-
tor from shift solenoid 2.
4)Measure the resistance between shift sole-
noid 2 connector and transmission ground.
Connector & terminal
No. 1 — Transmission 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 there poor contact in shift
solenoid 2 circuit?
Is the resistance between 10
and 16 Ω?
AT-75
Yes
Go to step 3. Repair the short
circuit in harness
between TCM and
transmission con-
nector.
Go to step 4. Go to step 6.
Even if the Go to step 5.
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 connector
in TCM and trans-
mission.
Repair the poor Replace the TCM.
contact. <Ref. to AT-46,
Transmission Con-
trol Module
(TCM).>
Go to step 7. Replace the shift
solenoid 2 assem-
bly. <Ref. to AT-
40, Shift Sole-
noids, Duty Sole-
noids and ATF
Temperature Sen-
sor.>
No