Subaru 2009 IMPREZA Service Manual page 1613

Diagnostic Trouble Code (DTC) Detecting Criteria
5. DIAGNOSTIC METHOD
• Abnormality Judgement
Judge as NG when Low side or High side becomes NG.
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Judgement Value
Malfunction Criteria
Low
Engine speed
Throttle position
Output voltage
Engine load
High
Engine speed
Throttle position
Output voltage
Engine load
Time Needed for Diagnosis:
Low side: 3000 ms
High side: 3000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
• Normality Judgement
Judge as OK and clear the NG when both Low side and High side become OK.
If the duration of time while the following conditions are met is longer than the time indicated, judge as OK.
Judgement Value
Malfunction Criteria
Low
Engine speed
Throttle position
Output voltage
Engine load
High
Engine speed
Throttle position
Output voltage
Engine load
Time Needed for Diagnosis:
Low side: Less than 1 second
High side: Less than 1 second
Threshold Value
< 2500 rpm
10 °
< 1 V
> 1.356 g/rev (0.05 oz/rev)
600 rpm — 900 rpm
< 2.75 °
2.36 V
< 0.4 g/rev (0.01 oz/rev)
Threshold Value
< 2500 rpm
10 °
1 V
> 1.356 g/rev (0.05 oz/rev)
600 rpm — 900 rpm
< 2.75 °
< 2.36 V
< 0.4 g/rev (0.01 oz/rev)
GD(H4DOTC)-25
GENERAL DESCRIPTION