Cummins ISB6.7 CM2350 (2013-17) Fault Code: 4234 PID: SPN: 3515 FMI: 4 Aftertreatment Diesel Exhaust Fluid Temperature Sensor – Voltage Below Normal or Shorted to Low Source. Low signal voltage or short circuit detected at the diesel exhaust fluid temperature sensor circuit

Cummins ISB6.7 CM2350 (2013-17) Fault Code: 4234 PID: SPN: 3515 FMI: 4 Aftertreatment Diesel Exhaust Fluid Temperature Sensor – Voltage Below Normal or Shorted to Low Source. Low signal voltage or short circuit detected at the diesel exhaust fluid temperature sensor circuit

Circuit Description
The aftertreatment diesel exhaust fluid (DEF) sensor is a smart device that communicates to the ECM via the J1939 datalink. The aftertreatment DEF sensor performs its own internal diagnostics and reports malfunctions back to the primary engine control module via the J1939 datalink. The aftertreatment DEF sensor monitors the tank level, temperature and quality of the DEF fluid.

Component Location
The aftertreatment diesel exhaust fluid (DEF) sensor is located in the aftertreatment DEF tank. Location of the tank and sensor is OEM dependent. Refer to the OEM service manual.

Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected the aftertreatment diesel exhaust fluid dosing temperature sensor signal circuit was out of range low.

Action Taken When the Fault Code is Active
1)The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
2)Diesel exhaust fluid injection into the aftertreatment system is disabled.

Conditions for Clearing the Fault Code
1)To validate the repair, start the engine and let it idle for 1 minute.
2)The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
3)The fault code status displayed by INSITE? electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
4)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.

Possible causes:
1)Malfunctioning DEF Quality Sensor