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Home >> Subaru >> 2006 >> Legacy GT spec.B >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 15 (Diagnostic Trouble Code (DTC) Detecting Criteria (H4SO)) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0101 Mass Or Volume Air Flow Circuit Range/Performance >> Diagnostic Method

Diagnostic Method

WARNING: This page is about a different variant/trim than selected.

Abnormality Judgment 

Judge as NG when the continuous time of completing the malfunction criteria below becomes more than the predetermined time.

Judgment Value 

JUDGMENT VALUE CHART

Malfunction Criteria Threshold Value
(Low side error)  
Output voltage < 1.2V
Engine speed ≥ 2000 rpm
Throttle opening angle ≥ 13°
Intake manifold pressure ≥ 53.3 kPa (400 mmHg, 15.7 inHg)
High side error (1)  
Output voltage ≥ 2.66 V
Engine speed 600 - 900 rpm
Throttle opening angle < 2.44°
Intake manifold pressure < 40.0 kPa (300 mmHg, 11.8 inHg)
High side error (2)  
Output voltage ≥ 1.45 V
Engine speed 600 - 900 rpm
Throttle opening angle < 2.44°
Intake manifold pressure < 40.0 kPa (300 mmHg, 11.8 inHg)
Fuel system diagnosis Rich side malfunction

Time Needed for Diagnosis  :

JUDGMENT VALUE CHART

Low side 3 seconds
High side 10 seconds

Malfunction Indicator Light Illumination:  Illuminates when malfunction occurs in 2 continuous driving cycles.

Normality Judgment 

Judge as OK when the criteria below are met.

Judgment Value 

JUDGMENT VALUE CHART

Malfunction Criteria Threshold Value
(Low side error)  
Output voltage ≥ 1.2 V
Engine speed ≥ 2000 rpm
Throttle opening angle ≥ 13°
Intake manifold pressure ≥ 53.3 kPa (400 mmHg, 15.7 inHg)
(High side error)  
Output voltage < 2.66 V
Engine speed 600 - 900 rpm
Throttle opening angle < 2.44°
Intake manifold pressure < 40.0 kPa (300 mmHg, 11.8 inHg)