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Home >> Toyota >> 2004 >> Prius >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (SFI) - Diagnosis >> DTC P0101: Mass Or Volume Air Flow Circuit Range/Performance Problem >> Typical Enabling Conditions
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Typical Enabling Conditions

CASE1: Mass air flow meter rationality 

ENABLING CONDITION

The monitor will run whenever the following DTCs are not present See LIST OF DISABLE A MONITOR 
Engine speed Less than 900 rpm
Idle ON
Engine coolant temperature 70°C(158°F) or more

CASE2: Mass air flow meter rationality 

TABLE

Engine speed 0 rpm or more
Throttle position sensor output 0.1 V or more