Subaru Legacy III (2000-2003 year). Manual - part 320
EN(H6DO)-82
ENGINE (DIAGNOSTICS)
DIAGNOSTICS FOR ENGINE STARTING FAILURE
5
CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL & IGNITOR ASSEMBLY CON-
NECTOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ECM.
3) Disconnect connector from ignition coil &
ignitor assembly.
4) Measure resistance of harness between
ECM and ignition coil & ignitor assembly
connector.
Connector & terminal
(B136) No. 24 — (E31) No. 1:
(B136) No. 23 — (E32) No. 1:
(B136) No. 22 — (E33) No. 1:
(B136) No. 21 — (E34) No. 1:
(B136) No. 20 — (E45) No. 1:
(B136) No. 19 — (E46) No. 1:
Is the measured value less than the speci-
fied value?
1
Ω
Repair harness
and connector.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and ignition
coil & ignitor
assembly connec-
tor
• Poor contact in
coupling connector
6
CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL & IGNITOR ASSEMBLY CON-
NECTOR.
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:
Does the measured value exceed the specified
value?
1 M
Ω
Repair ground
short circuit in har-
ness between
ECM and ignition
coil & ignitor
assembly connec-
tor.
7
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 moni-
toring voltage between ignition coil & ignitor
assembly 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 (–):
Does the measured value exceed the spec-
ified value?
10 V
Replace ignition
coil & ignitor
assembly. <Ref. to
IG(H6DO)-7, Igni-
tion Coil and Igni-
tor Assembly.>
8
CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM connector?
There is poor contact.
Repair poor con-
tact in ECM con-
nector.
Check fuel pump
circuit. <Ref. to
EN(H6DO)-84,
FUEL PUMP CIR-
CUIT, Diagnostics
for Engine Start-
ing Failure.>
Step
Value
Yes
No