Subaru LEGACY 2006 Manual page 409

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Step
1 CHECK BATTERY.
Check the battery voltage.
2 CHECK OPERATION OF STARTER MOTOR.
NOTE:
Check the security alarm is not sounding.
3 CHECK DTC.
4 CHECK INPUT SIGNAL FOR STARTER MO-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from starter
motor.
3) Turn the ignition switch to START.
4) Measure the power supply voltage between
starter motor connector terminal and engine
ground.
Connector & terminal
(B14) No. 1 (+) — Engine ground (–):
NOTE:
For AT model, place the select lever in P or N
range. For MT model, depress the clutch pedal.
5 CHECK HARNESS BETWEEN BATTERY
AND IGNITION SWITCH CONNECTOR.
1) Disconnect the connector from ignition
switch.
2) Measure the power supply voltage between
ignition switch connector and chassis ground.
Connector & terminal
(B72) No. 3 (+) — Chassis ground (–):
6 CHECK IGNITION SWITCH.
1) Disconnect the connector from ignition
switch.
2) Measure the resistance between ignition
switch terminals after turning the ignition
switch to START position.
Terminals
No. 2 — No. 3:
7 CHECK INPUT VOLTAGE OF STARTER RE-
LAY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from starter relay.
3) Connect the connector to ignition switch.
4) Measure the input voltage between starter
relay connector and chassis ground after turn-
ing the ignition switch to START position.
Connector & terminal
(B225) No. 13 (+) — Chassis ground (–):
(B225) No. 15 (+) — Chassis ground (–):
Diagnostics for Engine Starting Failure
Is the voltage more than 12 V? Go to step 2.
Does the starter motor oper-
ate?
Is DTC displayed? <Ref. to
EN(H4SO)(diag)-33, OPERA-
TION, Read Diagnostic Trouble
Code (DTC).>
Is the voltage more than 10 V? Check the starter
Is the voltage more than 10 V? Go to step 6.
Is the resistance less than 5
Ω?
Is the voltage more than 10 V? Go to step 8.
EN(H4SO)(diag)-57
ENGINE (DIAGNOSTICS)
Check Yes
Go to step 3.
Check the appro-
priate DTC using
the List of Diag-
nostic Trouble
Code (DTC). <Ref.
to
EN(H4SO)(diag)-
70, List of Diag-
nostic Trouble
Code (DTC).>
motor. <Ref. to
SC(H4SO)-6,
Starter.>
Go to step 7.
No
Charge or replace
the battery.
Go to step 4.
Repair the poor
contact of ECM
connector.
Go to step 5.
Repair the open
circuit or ground
short of harness
between ignition
switch and bat-
tery, and check
fuse SBF No. 6
and MAIN SBF.
Replace the igni-
tion switch.
Repair open or
ground short cir-
cuit of harness
between starter
relay and ignition
switch.