Subaru LEGACY 2006 Manual page 456

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Diagnostic Trouble Code (DTC) Detecting Criteria
5. DIAGNOSTIC METHOD
Abnormality Judgment
Judge as NG when the continuous time while meeting all of the malfunction criteria below is more than 2560
milliseconds (10 cycles).
Judgment Value
Malfunction Criteria
Output voltage
Rear oxygen sensor heater control duty
Time Needed for Diagnosis: 2.56 seconds
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
Normality Judgment
Judge as OK and clear the NG when the malfunction criteria below are completed.
Judgment Value
Malfunction Criteria
Output voltage
6. DTC CLEAR CONDITION
• When the OK idling cycle is completed 40 times in a row
• When "Clear Memory" is performed
7. MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
• When the OK driving cycle is completed 3 times in a row
• When "Clear Memory" is performed
8. FAIL SAFE
Sub feedback control: Not allowed.
9. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)
Threshold Value
High
≥ 20%
Threshold Value
Low
GD(H4SO)-19
GENERAL DESCRIPTION