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SPN 3251 - FMI 15 (Fault Code 2639)

SPN3251 FMI0/15
Aftertreatment Diesel Particulate Filter Differential Pressure - Data Valid But Above Normal Operating Range - Least Severe Level

ISB, ISC, and ISL - Aftertreatment System

CODES:
Fault Code: 2639
PID(P), SID(S): S324
SPN: 3251
FMI: 0/15
Lamp: None

REASON: Aftertreatment Diesel Particulate Filter Differential Pressure - Data Valid But Above Normal Operating Range - Least Severe Level. The soot load of the aftertreatment diesel particulate
filter has exceeded the recommended limits.

EFFECT: The aftertreatment diesel particulate filter lamp will be illuminated and will begin to flash
as the severity of the soot load increases. Engine protection derate based on severity.

Circuit Description:
The engine aftertreatment system monitors the soot load in the aftertreatment diesel particulate filter. Under normal operating conditions, the aftertreatment diesel particulate filter is self-cleaning, where soot is converted to carbon dioxide, nitrogen, and water. Under light load operating conditions, it can be necessary to perform a stationary regeneration of the aftertreatment diesel particulate filter. The soot load in the aftertreatment diesel particulate filter is estimated, using the aftertreatment differential pressure sensor and the calculated soot output of the engine.

This fault code can be triggered if the application is not operating at a duty cycle high enough to regenerate the aftertreatment diesel particulate filter. This fault code indicates that the exhaust temperatures exiting the turbocharger are not high enough to actively regenerate the soot that is trapped in the aftertreatment diesel particulate filter. It may be necessary to increase the duty cycle of the application in order to prevent plugging of the aftertreatment diesel particulate filter.

Component Location:
The aftertreatment diesel particulate filter is located in the exhaust system and is installed by the original equipment manufacturer (OEM).

Conditions for Running the Diagnostics:
This diagnostic runs continuously when engine speed is greater than 500 rpm.

Conditions for Setting the Fault Codes:
The electronic control module (ECM) detects that the soot load of the aftertreatment diesel particulate filter is above normal - least severe. The aftertreatment system needs to be regenerated to remove the soot.

Action Taken When the Fault Code is Active:
• The ECM will illuminate the aftertreatment diesel particulate filter lamp immediately after the diagnostic is set.
• The ECM will flash the aftertreatment diesel particulate filter lamp as the severity of the soot load increases.
• A mild torque derate will be applied to the output of the engine after the aftertreatment diesel particulate filter lamp begins to flash. (Note: There is no derate in emergency vehicle calibrations).

Conditions for Clearing the Fault Code:
The ECM will turn off the aftertreatment diesel particulate filter lamp immediately after the soot load in the aftertreatment diesel particulate filter has dropped below the least severe level.

Shop Talk:
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision history found on Quickserve™ Online for applicable fixes to the calibration stored in the ECM.
Note: This fault code indicates that the aftertreatment diesel particulate filter requires maintenance by performing a stationary regeneration procedure. This is a maintenance procedure only and is not covered by Cummins Inc. warranty.

Possible causes of this fault code include:
• The engine has been operating in light load operating conditions that prevent exhaust temperatures from being high enough to regenerate the aftertreatment diesel particulate filter.
• Possible engine damage that causes excessive black smoke to be generated.

The aftertreatment diesel particulate filter soot loading can be classified into four different stages. As the soot load increases, the aftertreatment diesel particulate filter lamp and the Cummins CHECK ENGINE (Amber) or STOP ENGINE (Red) lamp will operate according to the table below. Inadequate temperature for the exhaust gases entering the aftertreatment system can be a cause of high soot loads in the aftertreatment diesel particulate filter. The duty cycle of the application will need to be increased in order to prevent excessive soot from accumulating in the filter.




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