RAM 2500 Truck 2WD L6-6.7L DSL Turbo (2010)
Oxygen Sensor: Description and Operation
Oxygen Sensor Module - Operation
OPERATION
PICK UP MODELS
A separate O2 Sensor Module (1) is also used.
The engine aftertreatment system monitors the O2 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 system. This diagnostic monitors the status
message broadcast by the O2 Sensor Module (1) for the upstream O2 sensor's internal heater circuit. The PCM will set the fault if it receives a FMI
(Failure Mode Indicator) message from the O2 Sensor 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.
