Subaru Legacy 2004 Service Manual page 2564

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
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
backup light relay.
3) Measure the resistance of harness
between TCM and backup light relay connec-
tor.
Connector & terminal
(B55) No. 11 — (B356) No. 1:
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) Shift the select lever to "P" range.
5 CHECK TCM OUTPUT SIGNAL.
Shift the select lever to "R" range.
6 CHECK INPUT VOLTAGE FOR BACKUP
LIGHT RELAY.
Measure the voltage between back-up light
relay and chassis ground.
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is DTC of Transmission Range
Sensor Circuit (PRNDL Input)
circuit detected?
Is the resistance less than 1
"?
Is the resistance more than 1
M"?
Is the voltage more than 10 V? Go to step 5.
Is the voltage less than 1 V?
Is the voltage 10 — 13 V?
5AT(diag)-105
Yes
Perform the diag- Go to step 2.
nosis according to
DTC.
Go to step 3. Repair the open
circuit in harness
between TCM and
transmission con-
nector, and poor
contact in cou-
pling connector.
Go to step 4. Repair the short
circuit in harness
between TCM and
transmission con-
nector.
Replace the TCM.
<Ref. to 5AT-61,
Transmission Con-
trol Module
(TCM).>
Go to step 6. Replace the TCM.
<Ref. to 5AT-61,
Transmission Con-
trol Module
(TCM).>
Replace the back- Check open or
up light relay. short circuit in har-
ness between fuse
(No. 18) and
backup light relay.
No