Cummins X12 CM2350 X119B (2018 & Newer) Fault Code: 3253 PID: SPN: 3242 FMI: 16 Aftertreatment Diesel Particulate Filter Intake Temperature- Data Valid But Above Normal Operating Range- Moderately Severe Level
Circuit Description
The aftertreatment diesel particulate filter temperature sensor module is a smart device that communicates with the engine control module via the J1939 data link. The aftertreatment diesel partculate filter temperature sensor module performs its own internal diagnostics and reports malfunctions back to the engine control module using the J1939 data link. The aftertreatment diesel particulate filter temperature sensor module is used to measure the aftertreatment diesel oxidation catalyst intake temperature, aftertreatment diesel particulate filter intake temperature, and aftertreatment diesel particulate filter outlet temperature. The temperature probes are permanently attached to the aftertreatment diesel particulate filter temperature sensor module and can not be replaced individually.
Component Location
The aftertreatment diesel particulate filter intake temperature sensor is located in the aftertreatment system. It is located at the outlet of the diesel oxidation catalyst and before the diesel particulate filter. Refer to the original equipment manufacturer (OEM) service manual.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine is running and active regeneration of the aftertreatment diesel particulate filter is not occurring.
Conditions for Setting the Fault Codes
The aftertreatment diesel particulate filter intake temperature sensor reading was greater than 650°C [1202°F] for 85 seconds, or the difference between the diesel oxidation catalyst intake temperature and the diesel particulate filter intake temperature was greater than 365°C [689°F] for 50 seconds.
Action Taken When the Fault Code is Active
The ECM illuminates the red STOP ENGINE lamp immediately after the diagnostic runs and fails.
Active and stationary regeneration of the diesel particulate filter will be disabled.
Exhaust Gas Recirculation (EGR) valve operation will be disabled.
The engine will be shut down if the Engine Protection Shutdown feature is enabled.
Conditions for Clearing the Fault Code
To validate the repair using a Diagnostic Road Test, utilize a route that incorporates both stop and go city type driving and steady state highway type driving. It may be necessary to load the unit for certain diagnostics in the ECM to run.
To validate the repair using a Chassis Dynamometer, utilize a routine that incorporates acceleration and motoring events, steady state highway type operation, and load. This will simulate normal driving and allow the diagnostics in the ECM to run.
The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE immediately after the diagnostic runs and passes.
The ECM will turn off the red STOP ENGINE lamp 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
This fault code is logged when the ECM has detected a high temperature condition in the aftertreatment system and active regeneration of the aftertreatment diesel particulate filter is not occurring. The fault code indicates that a secondary fuel source is entering the aftertreatment system and is creating a temperature increase across the aftertreatment diesel particulate filter. This fault will go inactive immediately after the aftertreatment temperatures drop below the warning limit, and will likely be inactive when the vehicle is in the shop. For these reasons, this troubleshooting tree must be used for both active and inactive fault codes.
Possible causes of this fault code include:
Excessive engine oil or diesel fuel being introduced into the exhaust system from the engine
A damaged engine fuel injector causing unburned diesel fuel to enter the exhaust system
A face plugged aftertreatment diesel oxidation catalyst
The aftertreatment system must be inspected after making the appropriate repair outlined in this fault code troubleshooting tree. Progressive damage to the aftertreatment system may have occurred. Remove the exhaust aftertreatment system from the vehicle to inspect it for potential damaged and reuse. Refer to the OEM service manual.
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.
Possible Cause:
1) ECM calibration
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