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Home >> Toyota >> 2021 >> Prius XLE AWD-e >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Diagnostic Codes (4 Of 8) >> SFI System >> DTC P0401-9C: Exhaust Gas Recirculation "A" Low / Insufficient Flow [11/2015 - 12/2018] >> Typical Enabling Conditions
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Typical Enabling Conditions

Monitor runs whenever the following DTCs are not stored P0010 (Camshaft timing oil control valve)
P0011 (VVT system - advance)
P0012 (VVT system - retard)
P0016 (VVT system - misalignment)
P0031, P0032, P101D (Air fuel ratio sensor heater)
P0101, P0102, P0103 (Mass air flow meter)
P0106, P0107, P0108 (Manifold absolute pressure)
P0111, P0112, P0113 (Intake air temperature sensor)
P0116, P0117, P0118 (Engine coolant temperature sensor)
P011B (Engine coolant temperature/intake air temperature correlation)
P0121, P0122, P0123, P0222, P0223, P2135 (Throttle position sensor)
P0125 (Insufficient coolant temperature for closed loop fuel control)
P014C, P014D, P015A, P015B, P2195, P2196, P2237, P2238, P2239, P2252, P2253 (Air fuel ratio sensor)
P0171, P0172 (Fuel system)
P0327, P0328 (Knock control sensor)
P0335 (Crankshaft position sensor)
P0340, P0342, P0343 (Camshaft position sensor)
P0351 - P0354 (Igniter)
P0403 (EGR system)
P0657, P2102, P2103, P2111, P2112, P2119 (Throttle actuator)
P106A (Evaporative emission control system pressure sensor - manifold pressure sensor correlation)
P219A, P219C, P219D, P219E, P219F (Air-fuel ratio imbalance)
P2228, P2229 (Atmospheric pressure sensor)
Time after engine started 3 seconds or more
Time after engine fuel cut 2540 msec or more
Engine speed 950 to 1600 rpm
Vehicle speed 21 km/h (13 mph) or more
Engine coolant temperature 75°C (167°F) or higher
Auxiliary battery voltage 11 V or higher
Intake air temperature -10°C (14°F) or higher
Atmospheric pressure 76 kPa(abs) [11 psi(abs)] or higher
Air fuel ratio imbalance of clogged EGR runner fail Not set