Subaru Legacy 2004 Service Manual page 819

Step
6 CHECK INPUT SIGNAL FOR IGNITION COIL
& IGNITOR ASSY.
1) Connect the connector to ignition coil &
ignitor ASSY.
2) Check if voltage varies synchronously with
engine speed when cranking, while monitoring
voltage between ignition coil & ignitor ASSY
connector and engine ground.
Connector & terminal
(E12) No. 1 (+) — Engine ground (
(E12) No. 4 (+) — Engine ground (
7 CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL & IGNITOR ASSY CONNEC-
TOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Disconnect the connector from ignition coil
& ignitor ASSY.
4) Measure the resistance of harness
between ECM and ignition coil & ignitor ASSY
connector.
Connector & terminal
(B135) No. 18 — (E12) No. 1:
(B135) No. 17 — (E12) No. 4:
8 CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL & IGNITOR ASSY CONNEC-
TOR.
Measure the resistance of harness between
ECM and engine ground.
Connector & terminal:
(B135) No. 18 — Engine ground:
(B135) No. 17 — Engine ground:
9 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Diagnostics for Engine Starting Failure
Does the voltage vary more
than 10 V?
"
):
"
):
Is the resistance less than 1
'?
Is the resistance more than 1
M'?
Is there poor contact in ECM
connector?
EN(H4SO 2.5)(diag)-63
Check Yes
Go to step 7.
Go to step 8.
Go to step 9.
Repair the poor
contact in ECM
connector.
ENGINE (DIAGNOSTICS)
No
Replace the igni-
tion coil & ignitor
ASSY. <Ref. to
IG(H4SO 2.0)-8,
Ignition Coil & Igni-
tor ASSY.>
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and ignition
coil & ignitor ASSY
connector
• Poor contact in
coupling connector
Repair the ground
short circuit in har-
ness between
ECM and ignition
coil & ignitor ASSY
connector.
Check fuel pump
circuit. <Ref. to
EN(H4SO
2.5)(diag)-64,
FUEL PUMP CIR-
CUIT, Diagnostics
for Engine Start-
ing Failure.>