Subaru Legacy 2001 Service Manual page 73

DIAGNOSTICS FOR ENGINE STARTING FAILURE
No.
1 CHECK BATTERY.
2 CHECK INPUT SIGNAL FOR STARTER
MOTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from starter motor.
3) Turn ignition switch to ST.
4) Measure power supply voltage between
starter motor connector terminal and engine
ground.
Connector & terminal
(B14) No. 1 (+) — Engine ground (−):
NOTE:
Place the selector lever in the "P" or "N" posi-
tion.
3 CHECK GROUND CIRCUIT OF STARTER
MOTOR.
1) Turn ignition switch to OFF.
2) Disconnect terminal from starter motor.
3) Measure resistance of ground cable
between ground cable terminal and engine
ground.
4 CHECK HARNESS BETWEEN BATTERY
AND IGNITION SWITCH CONNECTOR.
1) Disconnect connector from ignition switch.
2) Measure power supply voltage between
ignition switch connector and chassis ground.
Connector & terminal
(B72) No. 1 (+) — Chassis ground (−):
5 CHECK IGNITION SWITCH.
1) Disconnect connector from ignition switch.
2) Measure resistance between ignition switch
terminals while turning ignition switch to the
"ST" position.
Terminals
No. 1 — No. 3:
6 CHECK INPUT VOLTAGE OF INHIBITOR
SWITCH.
1) Turn ignition switch to OFF.
2) Disconnect connector from inhibitor switch.
3) Connect connector to ignition switch.
4) Measure input voltage between inhibitor
switch connector terminal and engine ground
while turning ignition switch to ST.
Connector & terminal
(B12) No. 12 (+) — Engine ground (–):
7 CHECK INHIBITOR SWITCH.
1) Place the selector lever in the "P" or "N"
position.
2) Measure resistance between inhibitor
switch terminals.
Connector & terminal
(T3) No. 11 — No. 12:
Step
Is the voltage more than 12
V?
Is the voltage more than 10
V?
Is resistance less than 5
Ω?
Is the voltage more than 10
V?
Is the resistance less than
5 Ω?
Is the voltage more than 10
V?
Is the resistance less than
1 Ω?
EN(H6)-71
Check Yes
Go to step 2.
Go to step 3.
Check starter
motor. <Ref. to
SC(H6)-6,
Starter.>
Go to step 5.
Go to step 6.
Go to step 6.
Repair open or
ground short cir-
cuit in harness
between inhibitor
switch and starter
motor.
Engine (DIAGNOSTICS)
No
Charge or replace
battery.
Go to step 4.
Repair open cir-
cuit of ground
cable.
Repair open cir-
cuit in harness
between ignition
switch and
battery, and check
fuse SBF No. 4
and SBF No.1.
Replace ignition
switch.
Repair open or
ground short cir-
cuit in harness
between inhibitor
switch and ignition
switch.
NOTE:
Check security
system (if
equipped).
Replace inhibitor
switch. <Ref. to
AT-29 Inhibitor
Switch.>