Subaru 2009 IMPREZA Service Manual page 483

ENGINE (DIAGNOSTICS)
Step
1 CHECK STATUS OF MALFUNCTION INDI-
CATOR LIGHT.
1) Turn the ignition switch to OFF.
2) Disconnect the delivery (test) mode connec-
tor.
3) Turn the ignition switch to ON. (engine OFF)
2 CHECK HARNESS BETWEEN ECM AND
COMBINATION METER CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Turn the ignition switch to ON.
3 CHECK HARNESS BETWEEN ECM AND DE-
LIVERY (TEST) MODE CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Measure the resistance of harness between
ECM and delivery (test) mode connector.
Connector & terminal
(B76) No. 1 — (B136) No. 6:
(B75) No. 1 — (B135) No. 27:
4 CHECK POOR CONTACT.
Check for poor contact of ECM connector.
Malfunction Indicator Light
Does the malfunction indicator
light illuminate?
Does the malfunction indicator
light illuminate?
Is the resistance less than 1 ? Go to step 4.
Is there poor contact of ECM
connector?
EN(H4SO)(diag)-66
Check Yes
Go to step 2.
Repair the ground
short circuit of har-
ness between
ECM and combi-
nation meter con-
nector.
Repair the poor
contact of ECM
connector.
No
Repair the mal-
function indicator
light circuit. <Ref.
to
EN(H4SO)(diag)-
62, MALFUNC-
TION INDICATOR
LIGHT DOES NOT
COME ON, Mal-
function Indicator
Light.>
Go to step 3.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and delivery
(test) mode con-
nector
• Poor contact of
joint connector
Replace the ECM.
<Ref. to
FU(H4SO)-45,
Engine Control
Module (ECM).>