Subaru LEGACY 2006 Manual page 3587

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Step
1 CHECK DTC OF TCM.
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND BACK-UP LIGHT RELAY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from TCM and
back-up light relay.
3) Measure the resistance of harness
between TCM connector and back-up light
relay connector.
Connector & terminal
(B55) No. 11 — (B356) No. 2:
3 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure the resistance of harness between
TCM connector and chassis ground.
Connector & terminal
(B55) No. 11 — Chassis ground:
4 CHECK TCM OUTPUT SIGNAL.
1) Turn the ignition switch to ON. (engine
OFF)
2) Move the select lever to "P" range.
3) Measure the voltage between TCM con-
nector and chassis ground.
Connector & terminal
(B55) No. 11 — Chassis ground:
5 CHECK TCM OUTPUT SIGNAL.
1) Set the select lever to "R" range.
2) Is the voltage less than 1 V?
3) Measure the voltage between TCM con-
nector and chassis ground.
Connector & terminal
(B55) No. 11 — Chassis ground:
6 CHECK INPUT VOLTAGE FOR BACK-UP
LIGHT RELAY.
Measure the voltage between back-up light
relay and chassis ground.
Check
Is DTC of Transmission Range
Sensor Circuit (PRNDL Input)
detected?
Is the resistance less than 1
Ω?
Is the resistance more than 1
MΩ?
Is the voltage more than 10 V? Go to step 5.
Is the voltage 1.0 — 2.0 V?
Is the voltage 10 — 13 V?
5AT(diag)-94
Yes No
Perform the diag- Go to step 2.
nosis according to
DTC.
Go to step 3.
Repair the open
circuit of harness
between TCM and
transmission con-
nector, or poor
contact of connec-
tor.
Go to step 4. Repair the short
circuit of harness
between TCM and
transmission con-
nector.
Replace the TCM.
<Ref. to 5AT-56,
Transmission Con-
trol Module
(TCM).>
Go to step 6.
Replace the TCM.
<Ref. to 5AT-56,
Transmission Con-
trol Module
(TCM).>
Replace the back- Check open or
up light relay. short circuit of har-
ness between fuse
(No. 18) and back-
up light relay.