Subaru IMPREZA GD 2007 Series Manual page 1808

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Diagnostic Trouble Code (DTC) Detecting Criteria
5. DIAGNOSTIC METHOD
Abnormality Judgment
Judge as NG if the duration of time while the following criteria are met is 1 second (8 cycles) or more.
Judgment Value
Malfunction Criteria
Output voltage level
Front oxygen (A/F) sensor heater control
duty
Time Needed for Diagnosis: 1 second
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
Normality Judgment
Judge as OK and clear the NG when the malfunction criteria below are met.
Judgment Value
Malfunction Criteria
Output voltage level
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 CONDITIONS
• When the OK driving cycle is completed three times in a row
• When "Clear Memory" is performed
8. FAIL SAFE
• Front oxygen (A/F) sensor activation judgment: Front oxygen (A/F) sensor full activation is not complete,
or front oxygen (A/F) sensor half activation is not complete.
• Front oxygen (A/F) sensor main learning compensation: Not allowed to calculate.
• Compensation when starting the engine at high temperature: 0.3 → 0 at the MIN valve as normal.
• Purge control: Not allowed to purge.
9. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)
Threshold Value
High
≥ 12.5 %
Threshold Value
Low
GD(H4DOTC)-17
GENERAL DESCRIPTION