Subaru 2009 IMPREZA Service Manual page 1615

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
Output voltage
Engine speed
Throttle opening angle
Intake manifold pressure
High (1)
Output voltage
Engine speed
Throttle opening angle
Intake manifold pressure
High (2)
Output voltage
Engine speed
Throttle opening angle
Intake manifold pressure
Fuel system diagnosis
Time Needed for Diagnosis:
Low: 3000 ms
High: 10000 ms
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
• Normality Judgement
Judge as OK and clear the NG when both Low side and High side become OK.
Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.
Judgement Value
Malfunction Criteria
Low
Output voltage
Engine speed
Throttle opening angle
Intake manifold pressure
High
Output voltage
Engine speed
Throttle opening angle
Intake manifold pressure
Fuel system diagnosis
Time Needed for Diagnosis:
Low: Less than 1 second
High: Less than 1 second
Threshold Value
< 1.5 V
2500 rpm
15 °
53.3 kPa (400 mmHg,
15.7 inHg)
1.95 V
600 rpm — 900 rpm
< 4.1 °
< 52.7 kPa (395 mmHg,
15.6 inHg)
1.70 V
600 rpm — 900 rpm
< 4.1 °
< 52.7 kPa (395 mmHg,
15.6 inHg)
Rich side malfunction
Threshold Value
1.5 V
2500 rpm
15 °
53.3 kPa (400 mmHg,
15.7 inHg)
< 1.95 V
600 rpm — 900 rpm
< 4.1 °
< 52.7 kPa (395 mmHg,
15.6 inHg)
Rich side normal
GD(H4DOTC)-27
GENERAL DESCRIPTION