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Home >> Toyota >> 2011 >> Prius >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes) >> SFI System >> DTC P0401: Exhaust Gas Recirculation Flow Insufficient Detected >> Typical Enabling Conditions
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Typical Enabling Conditions

Monitor runs whenever following DTCs are not present None
Time after engine started 3 seconds or more
Time after engine fuel cut 2000 msec or more
Engine speed 950 to 1600 RPM
Vehicle speed 12.5 mph (20 km/h) or more
Engine speed change (165 msec.) -20 to 20 RPM
Time after engine load becomes stable (HVAC, Brake, Lockup) More than 1.2 seconds
Engine coolant temperature 70°C (158°F) or more
Battery voltage 11 V or more
Intake air temperature -10°C (14°F) or more
Atmospheric pressure 76 kPa (750 mmHg) or more