Subaru 2002 IMPREZA Service Manual page 1678

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
8 CHECK OUTPUT SIGNAL EMITTED FROM
TCM USING SUBARU SELECT MONITOR.
1)Turn the ignition switch to ON (engine OFF).
2)Throttle is fully open.
9 CHECK POOR CONTACT.
10 CHECK 2-4 BRAKE DUTY SOLENOID (IN
TRANSMISSION).
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 2-4 brake duty solenoid.
4)Measure the resistance between 2-4 brake
duty solenoid connector and transmission
ground.
Terminal
No. 1 — Transmission ground:
11 CHECK HARNESS CONNECTOR BETWEEN
TRANSMISSION AND 2-4 BRAKE DUTY SO-
LENOID.
Measure the resistance of harness between 2-
4 brake duty solenoid and transmission con-
nector.
Connector & terminal
(T4) No. 9 — (AT7) No. 1:
12 CHECK HARNESS CONNECTOR BETWEEN
TRANSMISSION AND 2-4 BRAKE DUTY SO-
LENOID.
Measure the resistance of harness between
transmission connector and transmission
ground.
Connector & terminal
(T4) No. 9 — Transmission ground:
Check
Is the value less than 25 %?
Is there poor contact in 2-4
brake duty solenoid circuit?
Is the resistance between 2.0
and 4.5 Ω?
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
AT-92
Yes
Even if the Go to step 9.
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 11. Replace the 2-4
brake duty sole-
noid. <Ref. to AT-
40, Shift Sole-
noids, Duty Sole-
noids and ATF
Temperature Sen-
sor.>
Go to step 12. Repair the open
circuit in harness
between 2-4 brake
duty solenoid and
transmission con-
nector.
Even if the Repair the short
POWER indicator circuit in harness
lights up, the cir- between 2-4 brake
cuit has returned duty solenoid and
to a normal condi- transmission con-
tion at this time. A nector.
temporary poor
contact of the con-
nector or harness
may be the cause.
Repair the har-
ness or connector
in line pressure
duty solenoid and
transmission.
No