Subaru LEGACY 2006 Manual page 309

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK INPUT SIGNAL OF ECM.
1) Turn the ignition switch to OFF.
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B135) No. 5 (+) — Chassis ground (–):
2 CHECK HARNESS BETWEEN ECM AND
MAIN FUSE BOX CONNECTOR.
1) Disconnect the connectors from ECM.
2) Measure the resistance of harness
between ECM and chassis ground.
Connector & terminal
(B135) No. 5 — Chassis ground:
3 CHECK FUSE No. 13.
Check
Is the voltage more than 10 V? Repair the poor
Is the resistance less than 10
Ω?
Is the fuse blown out?
EN(H4SO)(diag)-272
Yes No
Go to step 2.
contact of ECM
connector.
Repair the ground Go to step 3.
short circuit of har-
ness between
ECM connector
and battery termi-
nal.
Replace the fuse. Repair the har-
ness and connec-
tor.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
ECM and battery
• Poor contact in
ECM connector
• Poor contact of
battery terminal