Subaru IMPREZA GD 2007 Series Manual page 297

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
7 CHECK HARNESS BETWEEN ECM AND
REAR OXYGEN SENSOR CONNECTOR.
1) Turn the ignition switch to ON.
2) Measure the voltage between rear oxygen
sensor connector and chassis ground.
Connector & terminal
(E119) No. 3 (+) — Chassis ground (–):
8 CHECK REAR OXYGEN SENSOR SHIELD.
1) Turn the ignition switch to OFF.
2) Expose the rear oxygen sensor connector
body side harness sensor shield.
3) Measure the resistance between the sensor
shield and chassis ground.
Check
Is the voltage 0.2 — 0.5 V?
Is the resistance less than 1 Ω? Replace the rear
EN(H4SO)(diag)-188
Yes No
Go to step 8. Repair the harness
and connector.
NOTE:
Repair the follow-
ing locations.
• Open circuit of
harness between
the ECM and rear
oxygen sensor
• Poor contact of
the ECM and rear
oxygen sensor
• Poor contact in
ECM connector
Repair the open
oxygen sensor. circuit in the rear
<Ref. to oxygen sensor har-
FU(H4SO)-37, ness.
Rear Oxygen Sen-
sor.>