Subaru Legacy 2002 Service Manual page 858

DIAGNOSTICS FOR ENGINE STARTING FAILURE
No.
3 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:
On AT vehicles, place the selector lever in the
"P" or "N" position.
4 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.
5 CHECK HARNESS BETWEEN ECM AND
STARTER MOTOR CIRCUIT.
1) Turn ignition switch to OFF.
2) Measure resistance between starter motor
and ECM.
Connector & terminal
(B14) No. 1 — Engine ground:
6 CHECK HARNESS BETWEEN ECM AND
STARTER MOTOR CIRCUIT.
1) Turn ignition switch to START.
2) Measure resistance of fuse.
Connector & terminal
(B14) No. 1 — Engine ground:
7 CHECK HARNESS BETWEEN BATTERY
AND IGNITION SWITCH CONNECTOR.
1) Ignition switch to OFF.
2) Disconnect connector from ignition switch.
3) Measure power supply voltage between
ignition switch connector and chassis ground.
Connector & terminal
(B72) No. 1 (+) — Chassis ground (−):
8 CHECK HARNESS BETWEEN BATTERY
AND IGNITION SWITCH CONNECTOR.
1) Connect connector to ignition switch.
2) Turn ignition switch to START.
3) Measure voltage between ignition switch
and chassis ground.
Connector & terminal
(B72) No. 3 (+) — Chassis ground (−):
9 CHECK TRANSMISSION TYPE.
Step
Is the voltage more than 10
V?
Is resistance less than 5
Ω?
Is resistance less than 1
Ω?
Is resistance less than 1
Ω?
Is the voltage more than 10
V?
Is the voltage more than 10
V?
Is the vehicle AT?
EN(w/oOBD)-47
Check Yes
Go to step 4.
Check starter
motor. <Ref. to
SC-9,
INSPECTION,
Starter.>
Repair ground
short circuit.
Go to step 7.
Go to step 8.
Go to step 9.
Go to step 10.
Engine (Diagnostics)
No
Go to step 5.
Repair open cir-
cuit of ground
cable.
Go to step 6.
Repair ground
short circuit.
Repair open cir-
cuit in harness
between ignition
switch and bat-
tery.
Replace ignition
switch.
Repair open cir-
cuit between igni-
tion switch and
starter motor cir-
cuit.