Subaru IMPREZA GD 2007 Series Manual page 1653

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
20 CHECK HARNESS BETWEEN ECM AND
REAR OXYGEN SENSOR CONNECTOR.
1) Connect the connector to ECM.
2) Turn the ignition switch to ON.
3) Measure the voltage between rear oxygen
sensor connector and chassis ground.
Connector & terminal
(T6) No. 3 (+) — Chassis ground (–):
Check
Is the voltage 0.2 — 0.5 V?
EN(STI)(diag)-322
Yes No
Replace the rear Repair the harness
oxygen sensor. and connector.
<Ref. to
NOTE:
FU(H4DOTC)-48,
In this case, repair
Rear Oxygen Sen-
the following item:
sor.>
• Open circuit of
harness between
the ECM and rear
oxygen sensor
• Poor contact in
ECM connector
• Poor contact of
coupling connector