DTC P0202 Lincoln
Lost Communication With NOx Sensor A
Lost Communication With NOx Sensor A
Description
The aftertreatment system is equipped with two Nox Sensors and modules. The upstream NOx Sensor 1 1 is located on the Turbocharger elbow downpipe and is permanently connected to a corresponding Nox Sensor Module mounted to the hot side of the engine block. The downstream NOx Sensor 1 2 is located at the outlet of the SCR Catalyst and is permanently connected to a corresponding Nox Sensor Module which is mounted on the right frame rail. The NOx Sensors and NOx Sensor Modules are calibrated to each other and must be replaced as an assembly. The two NOx Sensor and Module asemblies are not interchangeable. The NOx Sensor Modules are smart devices and communicate with the Powertrain Control Module (PCM) over the J1939 Data Link. The NOx Sensor Modules perform their own internal diagnostics and report malfunctions back to the PCM. The NOx Sensors are used to monitor the efficiency of the SCR Catalyst and dosing system. The PCM will illuminate the Malfunction Indicator Lamp (MIL) after the diagnostic runs and fails in two consecutive drive cycles. The PCM will turn off the MIL immediately after the monitor runs and passes.
Cause and Solution
LOW BATTERY VOLTAGEFUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN HIGH RESISTANCEFUSED IGNITION SWITCH OUTPUT CIRCUIT SHORTED TO GROUNDFUSED IGNITION SWITCH OUTPUT CIRCUIT SHORTED TO THE GROUND CIRCUITGROUND CIRCUIT OPEN HIGH RESISTANCEJ1939 DATALINK plus CIRCUIT OPEN HIGH RESISTANCEJ1939 DATALINK (-) CIRCUIT OPEN HIGH RESISTANCEJ1939 DATALINK plus CIRCUIT SHORTED TO BATTERY OR GROUNDJ1939 DATALINK (-) CIRCUIT SHORTED TO BATTERY OR GROUNDJ1939 DATALINK plus CIRCUIT SHORTED TO ANOTHER CIRCUITJ1939 DATALINK (-) CIRCUIT SHORTED TO ANOTHER CIRCUITJ1939 DATALINK COMPONENT INTERNALLY SHORTEDFAULTY NOx SENSOR 1 1POWERTRAIN CONTROL MODULE (PCM)
Video Guide
Diagnostic Info
- DTC Code: P0202
- Brand: Lincoln