Subaru 2009 IMPREZA Service Manual page 495

ENGINE (DIAGNOSTICS)
Step
6 CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL AND IGNITOR ASSEMBLY
CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Disconnect the connector from the ignition
coil and ignitor assembly.
4) Measure the resistance of harness between
ECM and ignition coil and ignitor assembly con-
nector.
Connector & terminal
(B137) No. 18 — (E12) No. 1:
(B137) No. 19 — (E12) No. 4:
7 CHECK HARNESS BETWEEN ECM AND IG-
NITION COIL AND IGNITOR ASSEMBLY
CONNECTOR.
Measure the resistance of harness between
ECM and engine ground.
Connector & terminal:
(B137) No. 18 — Engine ground:
(B137) No. 19 — Engine ground:
Diagnostics for Engine Starting Failure
Is the resistance less than 1 ? Go to step 7.
Is the resistance 1 M or
more?
EN(H4SO)(diag)-78
Check Yes
Repair the poor
contact of ECM
connector.
No
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit in
harness between
ECM and ignition
coil and ignitor as-
sembly connector
• Poor contact of
coupling connector
Repair the ground
short circuit of har-
ness between
ECM and ignition
coil and ignitor
assembly connec-
tor.