P0420 Fault Code

P0420 NMHC Catalyst: Conversion Efficiency

Component / System

NMHC Catalyst - Conversion Efficiency

Monitor Strategy Description

Compare calculated total HC slip rate to modeled total HC slip rate

Fault Limit

Ratio = Calculated total HC slip rate Modeled total HC slip rate > 1.4

Enable Conditions

DPF Outlet Temperature > 100 °C
AHI FuelI Injection State Active
Start Coolant Temperature < 73 °C
Barometric Pressure 75 - 105 kPa
Ambient Air Temperature -8 - 55 °C
Total HC injected > 57g

Disable Conditions

No Active DTC's:
P2226, P2229, P0110, P0112, P0115, P0117, P20DD, P20E0, P229E, P2200, P0105, P0108;P2031, P2322, P2084, P242C, P242A, P242B, P0545, P0544, P2080, P1130, P1133, P20DC,P20D0, P20CF

Time Required For P0420 DTC To Be Set

300 seconds (with no more than 45s AHI dosing break)

MIL Illumination

2 Drive Cycles

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