Subaru Legacy 2005 Service Manual page 2494

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND CHASSIS GROUND.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B54) No. 17 — Chassis ground:
3 CHECK HARNESS CONNECTOR BETWEEN
TRANSMISSION AND CONTROL VALVE
BODY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from transmis-
sion.
3) Remove the transmission connector from
bracket.
4) Jack-up the vehicle and place it on rigid
racks.
NOTE:
Raise all wheels off floor.
5) Drain the ATF.
CAUTION:
Do not drain the ATF until it cools down.
6) Remove the oil pan, and disconnect the
control valve body connector.
7) Measure the resistance between transmis-
sion connector and control valve body connec-
tor.
Connector & terminal
(T4) No. 15 — (T11) No. 12:
4 CHECK HARNESS CONNECTOR BETWEEN
TRANSMISSION AND CONTROL VALVE
BODY.
Measure the resistance of harness connector
between control valve body connector and
chassis ground.
Connector & terminal
(T11) No. 12 — Chassis ground:
5 CHECK HIGH & LOW REVERSE CLUTCH
SOLENOID.
Measure the resistance between transmission
ground and control valve body connector.
Connector & terminal
(T11) No. 12 — Transmission ground:
6 CHECK POOR CONTACT.
Check that there are no poor contact in TCM
connector, transmission connector and control
valve body connector.
7 CHECK AFTER REPAIR.
1) Perform the clear memory mode.
2) Drive for a while, read the DTC, and verify
that there is no faulty.
Check
Is the resistance more than 1
MΩ?
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the resistance 3 — 9 Ω
Is there any loosing terminal,
entering foreign matter, dam-
aging connector body?
Is DTC displayed?
5AT(diag)-76
Yes
Go to step 3. Repair the short
circuit of harness
between TCM con-
nector and trans-
mission connector.
Go to step 4. Repair the open
circuit of harness
between control
valve body con-
nector and trans-
mission connector.
Go to step 5. Repair the open
circuit of harness
between control
valve body con-
nector and trans-
mission ground.
Go to step 6. Replace the con-
trol valve body.
<Ref. to 5AT-58,
Control Valve
Body.>
Repair the poor Go to step 7.
contact.
Replace the TCM. Temporary poor
<Ref. to 5AT-61, contact or open
Transmission Con- circuit occurs.
trol Module Recheck that the
(TCM).> harness connec-
tor has no faulty.
No