Subaru LEGACY 2006 Manual page 458

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Diagnostic Trouble Code (DTC) Detecting Criteria
5. DIAGNOSTIC METHOD
Abnormality Judgment
Judge as NG when either Low side or High side becomes NG.
Judge as NG when the continuous time of completing the malfunction criteria below becomes more than the
predetermined time.
Judgment Value
Malfunction Criteria
Low side
Engine speed
Throttle position
Intake air amount every 0.5 engine revs.
Output voltage
High side
Engine speed
Throttle position
Intake air amount every 0.5 engine revs.
Output voltage
Time Needed for Diagnosis: 3 seconds for low side, 7 seconds for high side
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
Normality Judgment
Judge as OK and clear the NG when both Low side and High side become OK.
Judge as OK when the malfunction criteria below are completed.
Judgment Value
Malfunction Criteria
Low side
Engine speed
Throttle position
Intake air amount every 0.5 engine revs.
Output voltage
High side
Engine speed
Throttle position
Intake air amount every 0.5 engine revs.
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
• Intake manifold pressure sensor process: Estimate the pressure from engine load.
• ISC feedback: Not allowed to calculate the amount of feedback.
9. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)
Threshold Value
< 2500 rpm
≥ 12°
≥ 0.55 g (0.019 oz)/rev
< 1.4 V
600 — 900 rpm
≤ 2.44°
< 0.4 g (0.014 oz)/rev
≥ 3.4 V
Threshold Value
< 2500 rpm
≥ 12°
≥ 0.55 g (0.019 oz)/rev
≥ 1.4 V
600 — 900 rpm
≤ 2.44°
< 0.4 g (0.014 oz)/rev
< 3.4 V
GD(H4SO)-21
GENERAL DESCRIPTION