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Reason:
Aftertreatment Outlet NOx Sensor Circuit – Abnormal Rate of Change. The aftertreatment outlet NOx sensor reading is not valid.
Effect:
None on performance.
Circuit Description:
The aftertreatment outlet NOx (nitrogen oxides) sensor is a smart device and communicates with the engine control module (ECM) via the J1939 data link. The aftertreatment outlet NOx sensor performs its own internal diagnostics and reports malfunctions back to the primary ECM using the J1939 data link. The NOx sensor is permanently attached to the NOx control module. They are serviced as a single component and can not be replaced individually. The aftertreatment outlet NOx sensor is used to measure the NOx emissions at the outlet of the aftertreatment system.
Component Location:
The aftertreatment outlet NOx sensor location can vary depending on engine application. It is usually located in the exhaust system at the outlet of the selective catalytic reduction (SCR) catalyst.
Conditions for Running the Diagnostics:
This diagnostic runs when the aftertreatment SCR outlet temperature has been above 200°C [392° F] for a calibratible period of time while the engine is running.
Conditions for Setting the Fault Codes:
The aftertreatment outlet NOx sensor reading was not valid.
Action Taken When the Fault Code is Active:
The ECM illuminates the amber CHECK ENGINE lamp and/or the Malfunction Indicator Lamp (MIL) immediately when the diagnostic runs and fails.
Conditions for Clearing the Fault Code:
1) To validate the repair, start and operate the engine to raise exhaust temperatures. This can be done by either driving the vehicle or initiating a stationary regeneration using INSITE™ electronic service tool.
2) The aftertreatment SCR outlet temperature must be above 200° C [392° F] for 60 seconds before the aftertreatment outlet NOx sensor can run its internal diagnostics.
3) The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
4) The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
5) For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where the diagnostic runs and passes.
6) The Reset All Faults command in INSITE™ electronic service tool can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.
Shop Talk:
This fault code sets when the aftertreatment outlet NOx sensor indicates to the ECM that it is not providing valid data.
Troubleshoot the aftertreatment outlet NOx sensor for Fault Codes 1887, 2771, or 3682 before troubleshooting this fault code
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.
For intermittent power supply and datalink communication issues with Aftertreatment Components, it is highly recommended that the OEM Power Distribution Center fuses and relays be thoroughly checked for loose, missing or intermittent connections.
Possible Causes:
1) Inactive fault codes
2) Faulty ECM
Related
Categories DTC TRUCKS, PACCAR, PX-9 CM2350 (2013-17)Tags 2013-17, CM2350, Fault Code:3545, FMI:10, PACCAR, PID:2202, PX-9, SPN:3226
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