Subaru IMPREZA 2002 Service Manual page 391

DIAGNOSTICS FOR ENGINE STARTING FAILURE
ENGINE (DIAGNOSTICS)
Check
;
the voltage more than 10 V?
2
Yes No
Go to step 3.
Repair harness
and connector.
NOTE:
In this case, repaii
the following:
Open circuit in
harness between
ignition coil & igni-
tor assembly, and
ignition switch con.
nector
Poor contact in
coupling connec-
3
Go to step 4.
Go to step 5.
Step
CHECK POWER SUPPLY CIRCUIT FOR IG-
NITION COIL 81 IGNITOR ASSEMBLY.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ignition coil &
ignitor assembly.
3)Turn the ignition switch to ON.
4)Measure the power supply voltage between
ignition coil & ignitor assembly connector and
engine ground.
Connector & terminal
(E12) No, 2 (+)
-
Engine ground ( - ) :
tors (822)
Repair harness
and connector.
NOTE:
In this case, repaii
the following:
Open circuit in
harness between
ignition coil & igni-
tor assembly con-
nector and engine
grounding terminal
Replace the igni-
tion coil & ignitor
assembly. <Ref. to
IG(S0HC)-7, Igni-
tion Coil and Igni-
tor Assembly.>
CHECK HARNESS OF IGNITION COIL 81 IG-
NITOR ASSEMBLY GROUND CIRCUIT.
1)Turn the ignition switch to OFF.
2)Measure the resistance between ignition coil
& ignitor assembly connector and engine
ground.
Connector & terminal
(€12) No. 3
-
Engine ground:
j
the resistance between 10
nd 15 kR?
s the voltage more than 10 V?
4 CHECK IGNITION COIL 81 IGNITOR ASSEM-
BLY.
1)Remove the spark plug cords.
2)Measure the resistance between spark plug
cord contact portions to check secondary coil.
Terminals
NO. 1
-
NO.
2 :
5
CHECK IGNITION COIL 81 IGNITOR ASSEM-
BLY.
Measure the resistance between spark plug
cord contact portions to check secondary coil.
Terminals
NO.
3
-
NO.
4:
6
CHECK INPUT SIGNAL FOR IGNITION COIL
8I IGNITOR ASSEMBLY.
1)Connect the connector to ignition coil & igni-
tor assembly.
2)Check if voltage varies synchronously with
engine speed when cranking, while monitoring
voltage between ignition coil & ignitor assem-
bly connector and engine ground.
Connector & terminal
(E12)
No.
1 (+)
-
Engine ground ( - ) :
CHECK INPUT SIGNAL FOR IGNITION COIL
8I IGNITOR ASSEMBLY.
Check if voltage varies synchronously with
engine speed when cranking, while monitoring
voltage between ignition coil & ignitor assem-
bly connector and engine ground.
7
Connector & terminal
(E12)
No.
4 (+)
-
Engine ground ( - ) :
Go to step 6. Replace the igni-
tion coil & ignitor
assembly. <Ref. to
IG(S0HC)-7, Igni-
tion Coil and Igni-
tor Assembly.>
Replace the igni-
tion coil & ignitor
assembly. <Ref. to
IG(SOHC)-7, Igni-
tion Coil and Igni-
tor Assembly.>
Go to step 7.
s the voltage more than 10 V?
i
the resistance between less
ian 5 R?
Go to step 8.
Replace the igni-
tion coil & ignitor
assembly. <Ref. ta
IG(SOHC)-7, Igni-
tion Coil and Igni-
tor Assembly.>
i
the resistance between 10
nd 15 kR?
EN(S0HC)-67