Subaru 2002 IMPREZA Service Manual page 297

DIAGNOSTICS FOR ENGINE STARTING FAILURE
ENGINE
(D
IAG
NOSTl CS)
Check
s the spark plug's status OK?
Step
CHECK SPARK PLUG CONDITION.
1)Remove the spark plug. <Ref. to IG(D0HC
TURBO)-5, INSTALLATION, Spark Plug.>
2)Check the spark plug condition. <Ref. to
IG(D0HC TURBO)-6, INSPECTION, Spark
CHECK IGNITION SYSTEM FOR SPARKS.
1)Connect the spark plug to ignition coil.
2)Release the fuel pressure. <Ref. to
FUEL PRESSURE, OPERATION, Fuel.>
3)Contact the spark plug's thread portion on
engine.
4)While opening the throttle valve fully, crank
the engine to check that spark occurs at each
cylinder.
CHECK POWER SUPPLY CIRCUIT FOR IG-
NlTlON COIL & IGNITOR ASSEMBLY.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ignition coil
i 3
ignitor assembly.
?)Turn the ignition switch to ON.
4)Measure the power supply voltage between
ignition coil & ignitor assembly connector and
engine ground.
Plug.>
!
FU(D0HC TURBO)-51, RELEASING OF
1
Connector & terminal
(€31) No. 3 (+)
-
Engine ground (-):
(€32) No. 3 (+)
-
Engine ground (-):
(E33) No. 3 (+)
-
Engine ground
( - ) I
(E34) No. 3 (+)
-
Engine ground ( - ) :
CHECK HARNESS OF IGNITION COIL & IG.
NITOR ASSEMBLY GROUND CIRCUIT.
1)Turn the ignition switch to OFF.
2)Measure the resistance between ignition coi
& ignitor assembly connector and engine
ground.
I
Connector & terminal
(€31) No. 2
-
Engine ground:
(E32) No, 2
-
Engine ground:
(E33) No. 2
-
Engine ground:
(E34) No. 2
-
Engine ground:
b
CHECK HARNESS BETWEEN ECM AND IG
NlTlON COIL & IGNITOR ASSEMBLY CON-
NECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ECM.
3)Disconnect the connector from ignition coil 8
ignitor assembly.
4)Measure the resistance of harness between
ECM and ignition coil & ignitor assembly con-
nector.
Connector & terminal
.
(6 136)
NO.
2 1
-
(E34)
NO.
1 :
(6136) NO. 22
-
(€33) NO. 1:
(6 136) NO. 23
-
(€32) NO. 1:
(6136) NO. 24
-
(€31) NO. 1:
Yes
Go to step 2.
Ioes spark occur at each cyl-
nder?
s the voltage more than 10 V?
Check fuel pump
system. <Ref. to
EN(D0HC
PUMP CIRCUIT,
Diagnostics for
Engine Starting
Failure.
>
TURBO)-76, FUEL
Go to step
4.
s the resistance between less
han
5 12?
s the resistance less than 1
n?
; o to step 5.
; o to step
6.
No
Replace the spark
3lug.
So to step 3.
Repair harness
2nd connector.
NOTE:
In this case, repai
the following:
Open circuit in
harness between
ignition coil & igni-
tor assembly, and
ignition switch con
nector
Poor contact in
coupling connec-
tors
Repair harness
and connector.
NOTE:
In this case, repai
the following:
Open circuit in
harness between
ignition coil & igni-
tor assembly con-
nector and engine
grounding termina
Repair harness
and connector.
NOTE:
In this case, repai
the following:
Open circuit in
harness between
ECM and ignition
coil & ignitor
assembly connec-
tor
Poor contact in
coupling connect0
EN(D0HC TURBO)-73