Cummins ISC CM2150 (2007-09) Fault Code: 1922 PID: SID 324 SPN: 3251 FMI: 0 Aftertreatment Diesel Particulate Filter Differential Pressure – Data Valid But Above Normal Operating Range – Most Severe Level. The soot load of the aftertreatment diesel particulate filter has exceeded the recommended limits.

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. If necessary, calibrate the ECM.

This fault code indicates that the soot load inside the aftertreatment diesel particulate filter has reached the maximum level, soot level stage 4. Regeneration of the aftertreatment diesel particulate filter at this stage is not possible. The aftertreatment diesel particulate filter must be inspected. If it meets the inspection criteria, it can be cleaned using an SPX air pulse, or equivalent, cleaning machine. If it does not meet the inspection criteria, it must be replaced.

If Fault Code 1922 is active at the same time as Fault Code 1981, it is necessary to clear Fault Code 1981 by following the troubleshooting tree for that fault, then referencing the steps for troubleshooting and clearing Fault Code 1922, below.

Note: Repeated occurrences of this fault code may indicate the engine requires frequent regeneration. Refer to symptom tree t147 (Aftertreatment Diesel Particulate Filter-Excessive Automatic and/or Stationary Regeneration) to identify the cause of frequent regeneration.

Possible causes:

1)The aftertreatment wiring harness connectors may be connected to the wrong aftertreatment temperature sensors.
2)The aftertreatment wiring harness or aftertreatment temperature sensor connector pin installation may be incorrect.
3)The engine has been operating in a light load condition that prevents exhaust temperatures from being high enough to actively regenerate the aftertreatment diesel particulate filter.
4)A possible base engine malfunction that causes excessive black soot to be generated.
5)If both Fault Code 1921 and 2777 are inactive with an active Fault Code 1922, this indicates that a regeneration inhibit message had been received by the engine ECM and that active regeneration of the aftertreatment diesel particulate filter was not allowed. Use the OEM service information to confirm that the OEM settings for the aftertreatment permit switch are configured correctly.
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 may need to be increased in order to prevent excessive soot from accumulating in the filter.

Possible repairs:

1)Remove and clean the aftertreatment diesel particulate filter differential pressure sensor supply tubes.
2)If no short circuit is found, replace the aftertreatment diesel particulate filter differential pressure sensor.
3)Calibrate the ECM with the calibration containing corrections to resolve Fault Code 1981 and/or 1922.
4)Replace the six injectors.
5)Change the duty cycle of the application in order to increase the temperature of the exhaust gases entering the aftertreatment system.
6)If necessary, calibrate the ECM.