Subaru IMPREZA GD 2007 Series Manual page 1814

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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 meeting the malfunction criteria below becomes three seconds or
more.
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
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in two continuous driving
cycles.
Normality Judgment
Judge as OK and clear the NG when both Low side and High side become OK.
Judge as OK when the criteria below are met.
Judgment Value
Malfunction Criteria
Low side
Engine speed
Throttle position
Output voltage
High side
Engine speed
Throttle position
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 CONDITIONS
• When the OK driving cycle is completed three 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.
• Heavy fuel judgment: Not allowed to carry out the heavy judgment.
• Fuel cut control: Not allowed to cut the over pressure charged fuel.
9. ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)
Threshold Value
< 2,500 rpm
≥ 10°
> 1.356 g (0.05 oz) /
rev
< 1.0 V
600 ←→ 900 rpm
< 2.75°
< 0.4 g (0.01 oz)/rev
≥ 2.36 V
Threshold Value
< 2,500 rpm
≥ 10°
≥ 1.0 V
600 ←→ 900 rpm
< 2.75°
< 2.36 V
GD(H4DOTC)-23
GENERAL DESCRIPTION