Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 4277 PID: SPN: 3364 FMI: 10 Aftertreatment Diesel Exhaust Fluid Quality- Abnormal Update Rate Of Change - EcuForce Truck (2024)

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Circuit Description
The DEF quality sensor is a smart device and communicates with the engine electronic control module (ECM) via the J1939 data link. The DEF quality sensor receives power and ground directly from the battery. The sensor performs its own internal diagnostics and reports malfunctions back to the primary engine ECM via the J1939 data link. The DEF quality sensor is used to measure the concentration of the DEF in the tank.

Component Location
The aftertreatment diesel exhaust fluid quality sensor is located in the aftertreatment diesel exhaust fluid tank. It may be a combination sensor with the aftertreatement diesel exhaust fluid tank level and tank temperature sensors. Location of the tank and sensor is OEM dependent. Refer to the OEM service manual.

Conditions for Running the Diagnostics
The diagnostic runs continuously when the following conditions are met:

Keyswitch is in the ON position or when the engine is running.
Ambient temperature is above -20°C [-4°F].
Vehicle altitude change is less than 305 m [1000 ft] in 1 hour.
Conditions for Setting the Fault Codes
The Engine Control Module (ECM) lost communication with the aftertreatment DEF quality sensor via the J1939 data link.

Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
Diesel exhaust fluid injection into the aftertreatment system is disabled.
Conditions for Clearing the Fault Code
To validate the repair, start the engine and let it idle for up to 5 minutes.
The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
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
Possible causes of this fault code include:

Low aftertreatment diesel exhaust fluid level in the diesel exhaust fluid tank

Shorted or open J1939 data link wiring.
Malfunctioning Aftertreatment DEF Quality Sensor.
Inactive counts can be caused by elevation changes or tank sloshing while driving.

Possible Cause:
1) DEF fluid
2) ECM calibration

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Cummins X15 CM2450 X124B (2018 & Newer) Fault Code: 4277 PID: SPN: 3364 FMI: 10 Aftertreatment Diesel Exhaust Fluid Quality- Abnormal Update Rate Of Change - EcuForce Truck (2024)

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