Subaru Legacy 2002 Service Manual page 1283

DIAGNOSTICS FOR ENGINE STARTING FAILURE
Engine (DIAGNOSTICS)
No.
5 CHECK HARNESS BETWEEN ECM AND
IGNITION COIL & IGNITOR ASSEMBLY
CONNECTOR.
Measure resistance of harness between ECM
and engine ground.
Connector & terminal:
(B136) No. 24 — Engine ground:
(B136) No. 23 — Engine ground:
(B136) No. 22 — Engine ground:
(B136) No. 21 — Engine ground:
(B136) No. 20 — Engine ground:
(B136) No. 19 — Engine ground:
6 CHECK INPUT SIGNAL FOR IGNITION
COIL & IGNITOR ASSEMBLY.
1) Connect connector to ignition coil & ignitor
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
(E31) No. 1 (+) — Engine ground (–):
(E32) No. 1 (+) — Engine ground (–):
(E33) No. 1 (+) — Engine ground (–):
(E34) No. 1 (+) — Engine ground (–):
(E45) No. 1 (+) — Engine ground (–):
(E46) No. 1 (+) — Engine ground (–):
7 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Step
Is the resistance more than
1 MΩ?
Is the voltage more than 10
V?
Is there poor contact in
ECM connector?
EN(H6)-76
Check Yes
Go to step 6.
Go to step 7.
Repair poor con-
tact in ECM con-
nector.
No
Repair ground
short circuit in
harness between
ECM and ignition
coil & ignitor
assembly connec-
tor.
Replace ignition
coil & ignitor
assembly. <Ref.
to IG(H6)-7, Igni-
tion Coil and Igni-
tor Assembly.>
Check fuel pump
circuit. <Ref. to
EN(H6)-78, FUEL
PUMP CIRCUIT,
Diagnostics for
Engine Starting
Failure.>