Subaru IMPREZA 2004 Service Manual page 750

ENGINE (DIAGNOSTICS)
Step
7 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure the resistance of harness between
ECM and fuel injector connector.
Connector & terminal
(B134) No. 13 — Chassis ground:
8 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
1)Connect the connector to #3 fuel injector.
2)Measure the resistance of harness between
ECM and fuel injector connector.
Connector & terminal
(B134) No. 14 — (B136) No. 2:
9 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure the resistance of harness between
ECM and fuel injector connector.
Connector & terminal
(B134) No. 14 — Chassis ground:
10 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
1)Connect the connector to #4 fuel injector.
2)Measure the resistance of harness between
ECM and fuel injector connector.
Connector & terminal
(B134) No. 15 — (B136) No. 2:
11 CHECK HARNESS BETWEEN ECM AND
FUEL INJECTOR CONNECTOR.
Measure the resistance of harness between
ECM and fuel injector connector.
Connector & terminal
(B134) No. 15 — Chassis ground:
12 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Diagnostics for Engine Starting Failure
Is the resistance less than 1
Ω?
Is the resistance 5 — 20 Ω?
Is the resistance less than 1
Ω?
Is the resistance 5 — 20 Ω?
Is the resistance less than 1
Ω?
Is there poor contact in ECM
connector?
EN(H4SOw/oOBD)(diag)-54
Check
Repair the ground
short circuit in har-
ness between
ECM and fuel
injector connector.
Go to step 9.
Repair the ground
short circuit in har-
ness between
ECM and fuel
injector connector.
Go to step 11.
Repair the ground
short circuit in har-
ness between
ECM and fuel
injector connector.
Repair the poor
contact in ECM
connector.
Yes No
Go to step 8.
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and fuel
injector connector
• Poor contact in
coupling connector
(B22)
Go to step 10.
Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following:
• Open circuit in
harness between
ECM and fuel
injector connector
• Poor contact in
coupling connector
(B22)
Go to step 12.
Inspection using
"General Diagnos-
tic Table". <Ref. to
EN(H4SO)(diag)-
260, INSPEC-
TION, General
Diagnostic Table.>