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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 211 (6.7L - DTCS P0008 To P026A - 2500 & 3500) >> Diagnosis And Testing >> P0030-O2 Sensor 1/1 Heater Circuit Open >> Theory Of Operation

Theory Of Operation

WARNING: This page is about a different car, the 2012 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.

The engine aftertreatment system monitors the oxygen content in the diesel engine exhaust. The Powertrain Control Module (PCM) monitors the exhaust gases for oxygen content and varies the rich/lean fuel mixture of the intake air fuel mixture to adjust the sensor. This monitor checks the status message broadcast by the Smart O2 Sensor Module for the Downstream O2 Sensors internal heater circuit. The PCM will set the fault if it receives an FMI (Failure Mode Indicator) message from the Smart O2 Module. The PCM will illuminate the MIL lamp immediately when the diagnostic runs and fails. The PCM will turn off the MIL lamp diagnostic runs and passes in four consecutive drive cycles.

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