Subaru IMPREZA 2002 Service Manual page 383

DIAGNOSTICS FOR ENGINE STARTING FAILURE
.
ENGINE (DIAGNOSTICS)
Step
CHECK BATTERY.
CHECK INPUT SIGNAL FOR STARTER MO-
Check
Is the voltage more than 12 V?
Is the voltage more than 10 V?
TOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from starter motor.
3)Turn the ignition switch to ST.
4)Measure the power supply voltage between
starter motor connector terminal and engine
ground.
Connector & terminal
(614) No. 1 (+)
-
Engine ground
( - ) I
NOTE:
*On AT vehicles, place the selector lever in the
" P or "N" position.
*On MT vehicles, depress the clutch pedal.
CHECK GROUND CIRCUIT OF STARTER
MOTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the terminal from starter motor.
3)Measure the resistance of ground cable
between ground cable terminal and engine
ground.
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.
(672) No. 1 (+)
-
Chassis ground (-):
Connector & terminal
CHECK IGNITION SWITCH.
1)Disconnect the connector from ignition
switch.
2)Measure the resistance between ignition
switch terminals while turning ignition switch to
the "ST" position.
Terminals
NO. 1 -NO. 3:
CHECK TRANSMISSION TYPE.
CHECK INPUT VOLTAGE OF INHIBITOR
SWITCH.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from inhibitor
switch.
3)Connect the connector to ignition switch.
4)Measure the input voltage between inhibitor
switch connector terminal and engine ground
while turning ignition switch to ST.
Connector & terminal
(612) No. 12 (+)
-
Engine ground ( - ) :
30 to step
3 .
I
Is the resistance less than 5
Go to step 4.
I
>heck the starter
notor. <Ref. to
X - 6 , Starter.>
30 to step 6.
; o to step 6.
Is the voltage more than 10 V?
Repair open circuit
of ground cable.
Repair open circuit
in harness
between ignition
switch and bat-
tery, and check
fuse SBF No. 4
and SBF No.1.
Replace the igni-
tion switch.
I
I
Is the resistance less than
5
30 to step 7.
20 to step 8.
3epair open or
jround short cir-
:uit in harness
letween inhibitor
;witch and starter
notor.
Q?
Go to step 11.
Repair open or
ground short cir-
cuit in harneb
between inhibitor
switch and ignition
switch.
NOTE:
Check security
system (ii
equipped). <Ref.
to SL-21, Security
System. >
Replace the inhibi-
tor switch.<Ref. to
AT-28, Inhibitor
Switch.>
s the transmission type AT?
s the voltage more than 10 V?
CHECK INHIBITOR SWITCH.
1)Place the selector lever in the "P" or "N" posi-
tion.
2)Measure the resistance between inhibitor
switch terminals.
Connector & terminal
(T3) NO. 11
-
NO. 12:
Is the resistance less than 1
a?
the battery.
EN(S0HC)-59