Subaru 2009 IMPREZA Service Manual page 742

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Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

5. DIAGNOSTIC METHOD

• Abnormality Judgement

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Judgement Value

Malfunction Criteria

Output voltage level

Rear oxygen sensor heater control duty

Time Needed for Diagnosis: 8 ms × 320 time(s)

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-

• Normality Judgement

Judge as OK and clear the NG if the continuous time while the following conditions are established is more

than the predetermined time.

Judgement Value

Malfunction Criteria

Output voltage level

Time Needed for Diagnosis: Less than 1 second

Threshold Value

Threshold Value