Subaru Legacy 2002 Service Manual page 866

DIAGNOSTICS FOR ENGINE STARTING FAILURE
No.
1 CHECK IGNITION SYSTEM FOR SPARKS.
1) Remove plug cord cap from each spark
plug.
2) Install new spark plug on plug cord cap.
CAUTION:
Do not remove spark plug from engine.
3) Contact spark plug's thread portion on
engine.
4) While opening throttle valve fully, crank
engine to check that spark occurs at each
cylinder.
2 CHECK POWER SUPPLY CIRCUIT FOR
IGNITION COIL & IGNITOR ASSEMBLY.
1) Turn ignition switch to OFF.
2) Disconnect connector from ignition coil &
ignitor assembly.
3) Turn ignition switch to ON.
4) Measure power supply voltage between
ignition coil & ignitor assembly connector and
engine ground.
Connector & terminal
(E12) No. 2 (+) — Engine ground (−):
3 CHECK HARNESS OF IGNITION COIL &
IGNITOR ASSEMBLY GROUND CIRCUIT.
1) Turn ignition switch to OFF.
2) Measure resistance between ignition coil &
ignitor assembly connector and engine
ground.
Connector & terminal
(E12) No. 3 — Engine ground:
4 CHECK IGNITION COIL & IGNITOR ASSEM-
BLY.
1) Remove spark plug cords.
2) Measure resistance between spark plug
cord contact portions to check secondary coil.
Terminals
No. 1 — No. 2:
5 CHECK IGNITION COIL & IGNITOR ASSEM-
BLY.
Measure resistance between spark plug cord
contact portions to check secondary coil.
Terminals
No. 3 — No. 4:
Step
Does spark occur at each
cylinder?
Is the voltage more than 10
V?
Is the resistance between
less than 5 Ω?
Is the resistance between
10 and 15 Ω?
Is the resistance between
10 and 15 Ω?
EN(w/oOBD)-55
Check Yes
Check fuel pump
system. <Ref. to
EN(w/oOBD)-58,
FUEL PUMP
CIRCUIT, Diag-
nostics for Engine
Starting Failure.>
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
Engine (Diagnostics)
No
Go to step 2.
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit or
ground short in
harness between
ignition coil & igni-
tor assembly, and
ignition switch
connector
¼ Poor contact in
coupling connec-
tor (B22)
Repair harness
and connector.
NOTE:
In this case,
repair the follow-
ing:
¼ Open circuit in
harness between
ignition coil & igni-
tor assembly con-
nector and engine
grounding termi-
nal
Replace ignition
coil & ignitor
assembly.
Replace ignition
coil & ignitor
assembly.