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Home >> Subaru >> 2017 >> Forester 2.0XT Touring >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (Engine Control System (Diagnostics) (P000A To P015B) (H4DO)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0101 Mass Or Volume Air Flow Sensor "A" Circuit Range/Performance >> Diagnostic Method

Diagnostic Method

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

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.

JUDGMENT VALUE SPECIFICATION

Malfunction Criteria Threshold Value
Low 
Output voltage
< Map 1
High 
Output voltage
≥ Map 2
MAP 1 SPECIFICATION

Engine speed (RPM) 1900 3000 4000 5000 6000 6800
Output voltage (V) 1.73 1.96 2.12 2.25 2.37 2.45
MAP 2 SPECIFICATION

Engine speed (RPM) 525 700 925
Output voltage (V) 1.69 1.83 1.97

Time needed for diagnosis: 

Low: 5000ms

High: 5000ms

Malfunction indicator light illumination:  Illuminates as soon as a malfunction occurs.