Subaru LEGACY 2006 Manual page 3477

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Diagnostic Procedure without Diagnostic Trouble Code (DTC)
Step
1 CHECK SPARE FUSE.
2 CHECK FWD SWITCH.
Connect the Subaru Select Monitor to the data
link connector.
3 CHECK COMBINATION METER.
4 CHECK HARNESS CONNECTOR BETWEEN
TCM AND FWD SWITCH.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from TCM.
3) Measure the resistance of harness
between TCM and FWD switch connector.
Connector & terminal
(B55) No. 17 — (F27) No. 18:
5 CHECK HARNESS CONNECTOR BETWEEN
FWD SWITCH AND CHASSIS GROUND.
Measure the resistance of harness between
FWD switch and chassis ground.
Connector & terminal
(F27) No. 19 — Chassis ground:
6 CHECK HARNESS CONNECTOR BETWEEN
TCM AND FWD SWITCH.
Measure the resistance of harness connector
between TCM and body to make sure that cir-
cuit does not short.
Connector & terminal
(B55) No. 17 — Chassis ground:
7 CHECK INPUT SIGNAL FOR TCM.
1) Turn the ignition switch to OFF.
2) Connect the connector to TCM.
3) Turn the ignition switch to ON.
4) Measure the signal voltage for TCM while
installing the fuse to FWD switch connector.
Connector & terminal
(B55) No. 17 (+) — Chassis ground (–):
8 CHECK INPUT SIGNAL FOR TCM.
Measure the signal voltage for TCM with the
fuse removed from FWD switch connector.
Connector & terminal
(B55) No. 17 (+) — Chassis ground (–):
9 CHECK THE BODY INTEGRATED UNIT.
Check DTC of body integrated unit.
10 CHECK COMBINATION METER.
Check the AWD warning light. <Ref. to IDI-3,
INSPECTION, Combination Meter System.>
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the spare fuse OK?
When the fuse is inserted to
FWD switch, does the LED illu-
minate?
Does the AWD warning light
illuminate?
Is the resistance less than 1
Ω?
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 10.5
V?
Is DTC of CAN communication
displayed?
Is the AWD warning light OK? Go to step 11.
4AT(diag)-91
Yes No
Go to step 2. Replace the fuse.
Go to step 3. Go to step 4.
Go to INSPEC- Go to step 9.
TION FOR
SPORT SHIFT
SWITCH. <Ref. to
4AT(diag)-93,
CHECK SPORT
SHIFT SWITCH,
Diagnostic Proce-
dure without Diag-
nostic Trouble
Code (DTC).>
Go to step 5.
Repair the open
circuit of harness
between TCM and
FWD switch con-
nectors.
Go to step 6. Repair the open
circuit of harness
between FWD
switch connector
and chassis
ground.
Go to step 7. Repair the short
circuit of harness
between TCM and
FWD switch con-
nectors.
Go to step 8. Go to step 10.
Go to step 9. Replace the TCM.
<Ref. to 4AT-62,
Transmission Con-
trol Module
(TCM).>
Go to step 10.
Perform the diag-
nosis according to
DTC.
Replace the com-
bination meter
assembly. <Ref. to
IDI-14, Combina-
tion Meter.>