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	Threshold Value
Low
Output voltage	< 1.74 V
Engine speed	≥ 2000 RPM
Throttle opening angle	≥ 15°
Intake manifold pressure	≥ 73.3 kPa (550 mmHg, 21.7 inHg)
High (1)
Output voltage	≥ 1.83 V
Engine speed	500 RPM - 850 RPM
Throttle opening angle	< 3.5°
Intake manifold pressure	< 46.7 kPa (350 mmHg, 13.8 inHg)
High (2)
Output voltage	≥ 1.73 V
Engine speed	500 RPM - 850 RPM
Throttle opening angle	< 3.5°
Intake manifold pressure	< 46.7 kPa (350 mmHg, 13.8 inHg)
Fuel system diagnosis	Rich side malfunction

Time Needed for Diagnosis: 

Low: 5000 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	Threshold Value
Low
Output voltage	≥ 1.74 V
Engine speed	≥ 2000 RPM
Throttle opening angle	≥ 15°
Intake manifold pressure	≥ 73.3 kPa (550 mmHg, 21.7 inHg)
High
Output voltage	< 1.83 V
Engine speed	500 RPM - 850 RPM
Throttle opening angle	< 3.5°
Intake manifold pressure	< 46.7 kPa (350 mmHg, 13.8 inHg)
Fuel system diagnosis	Rich side normal

Time Needed for Diagnosis: 

Low: Less than 1 second

High: Less than 1 second