Subaru LEGACY 2006 Manual page 3583

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
1 CHECK DTC OF TCM.
2 CHECK ECM.
3 CHECK FUSE (NO. 32).
1) Turn the ignition switch to OFF.
2) Remove the fuse.
4 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from TCM and
transmission.
3) Measure the resistance of harness
between TCM connector and transmission
connector.
Connector & terminal
Turbo model:
(B55) No. 19 — (B137) No. 9:
Non-turbo model:
(B55) No. 19 — (B136) No. 31:
5 CHECK HARNESS CONNECTOR BETWEEN
TCM AND ECM.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B55) No. 19 — Chassis ground:
6 CHECK TCM OUTPUT SIGNAL.
1) Connect the TCM and ECM connector.
2) Turn the ignition switch to ON. (engine
OFF)
3) Shift the select lever to "P" range.
4) Measure the voltage between TCM con-
nector and chassis ground.
Connector & terminal
(B55) No. 19 (+) — Chassis ground (–):
7 CHECK TCM OUTPUT SIGNAL.
1) Shift the select lever to "D" range.
2) Measure the voltage between TCM con-
nector and chassis ground.
Connector & terminal
(B55) No. 19 (+) — Chassis ground (–):
8 CHECK POOR CONTACT.
Check
Is DTC of Transmission Range
Sensor Circuit (PRNDL Input)
detected?
Is the communication between
Subaru Select Monitor and
ECM normal?
Is the fuse (No. 32) blown out? Replace the fuse
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the voltage less than 1 V?
Is the voltage more than 10 V? Go to step 8.
Is there any open or poor con-
tact of connector (loosing ter-
minal, entering foreign matter,
damaging connector body)?
5AT(diag)-90
Yes No
Perform the diag- Go to step 2.
nosis according to
DTC.
Go to step 3.
Perform the diag-
nosis according to
DTC concerning
ECM.
Go to step 4.
(No. 32). If the new
fuse (No. 32) has
blown out easily,
repair the short cir-
cuit of harness
between fuse (No.
32) and TCM.
Go to step 5.
Repair the open
circuit of harness
between TCM and
transmission con-
nector, or poor
contact of connec-
tor.
Go to step 6. Repair the short
circuit of harness
between transmis-
sion connector
and chassis
ground.
Go to step 7. Replace the TCM.
<Ref. to 5AT-56,
Transmission Con-
trol Module
(TCM).>
Replace the TCM.
<Ref. to 5AT-56,
Transmission Con-
trol Module
(TCM).>
Repair the poor Check the neutral
contact. switch of ECM.