Subaru 2002 IMPREZA Service Manual page 1665

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. 15 — Chassis ground:
3 CHECK LOW CLUTCH TIMING SOLENOID.
Measure the resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 3 — No. 16:
4 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1)Connect the connectors to TCM and trans-
mission.
2)Turn the ignition switch to ON (engine OFF).
3)Move the select lever to "D" range.
4)Measure the voltage between TCM connec-
tor and chassis ground.
Connector & terminal
(B54) No. 15 (+) — Chassis ground ( − − − − ):
5 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1)Turn the HOLD mode switch to ON.
2)Measure the voltage between TCM connec-
tor and chassis ground.
Connector & terminal
(B54) No. 15 (+) — Chassis ground ( − − − − ):
6 CHECK POOR CONTACT.
7 CHECK LOW CLUTCH TIMING SOLENOID
(IN TRANSMISSION).
1)Remove the transmission connector from
bracket.
2)Lift-up or raise the vehicle and support with
safety stand.
NOTE:
On AWD models, raise all wheels off ground.
3)Drain the ATF.
CAUTION:
Do not drain the ATF until it cools down.
4)Remove the oil pan, and disconnect connec-
tor from low clutch timing solenoid.
5)Measure the resistance between low clutch
timing solenoid connector and transmission
ground.
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 more than 9 V?
Is the voltage less than 1 V?
Is there poor contact in low
clutch timing solenoid circuit?
Is the resistance between 10
and 16 Ω?
AT-79
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
TCM and trans-
mission.
Repair the poor Replace the TCM.
contact. <Ref. to AT-46,
Transmission Con-
trol Module
(TCM).>
Go to step 8. Replace the low
clutch timing sole-
noid. <Ref. to AT-
40, Shift Sole-
noids, Duty Sole-
noids and ATF
Temperature Sen-
sor.>
No