Hybrid Hardware and Monitor Operation
WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, 2011 Ford Fusion, 2010 Mercury Milan, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
- The hybrid vehicle exhaust system uses two separate HO2S. The front HO2S is a universal HO2S and is the primary fuel control sensor. This sensor is the first HO2S in the exhaust stream and is referred to as the front or stream 1 HO2S. The last HO2S downstream in the exhaust system is used to monitor the catalyst and is referred to as the rear or stream 2 HO2S. For additional HO2S information, refer to the HEATED OXYGEN SENSOR (HO2S) MONITOR .
Typical monitor entry conditions:
- minimum 5 seconds since start-up at 21°C (70°F)
- engine coolant temperature is between 66°C - 110°C (150°F - 230°F)
- intake air temperature is between -7°C - 82°C (20°F - 180°F)
- time since entering closed loop is 30 seconds
- inferred rear HO2S sensor temperature, minimum of 427°C (800°F)
- exhaust gas recirculation (EGR) is between 0% - 16%
- part throttle, maximum rate of change 0.24 volt/0.05 sec
- vehicle speed is between 56 -129 km/h (35 - 80 mph)
- fuel level is greater than 15%
- air mass is between 11 - 26 g/sec (1.5 - 3.5 lb/min)
- engine speed is between 1,000 - 2,500 RPM
- engine load is between 20 - 60%
- The DTC associated with this test is DTC P0420. Because an exponentially weighted moving average algorithm is used to determine a concern, up to six driving cycles may be required to illuminate the MIL during normal customer driving. If the KAM is reset or the battery is disconnected, a concern illuminates the MIL in two drive cycles.