Aftertreatment 1 Diesel Particulate Filter Differential Pressure – Data Valid But Above Normal Operating Range – Moderately Severe Level
Overview
| CODE | REASON | EFFECT |
| Fault Code: 1921 PID: S324 SPN: 3251 FMI: 0/16 LAMP: Amber SRT: |
The soot load of the aftertreatment diesel particulate filter has exceeded the recommended limits.
|
Possible reduced engine performance.
|
|
Aftertreatment Diesel Particulate Filter Differential Pressure Sensor Circuit
|
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.
Component Location
The aftertreatment diesel particulate filter is located in the exhaust system and is installed by the original equipment manufacturer (OEM). Refer to the OEM service manual.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine is running.
Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected the soot load of the aftertreatment diesel particulate filter was moderately severe. The aftertreatment system needs to be regenerated to remove the soot.
Action Taken When the Fault Code is Active
- The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs and fails.
The ECM will flash the aftertreatment lamp immediately after the diagnostic fails.
- Torque output of the engine will be reduced as the soot load in the aftertreatment diesel particulate filter increases.
Mobile regeneration of the diesel particulate filter will be disabled.
- Exhaust gas recirculation (EGR) valve operation will be disabled.
Conditions for Clearing the Fault Code
- After completing a stationary regeneration (as instructed in this fault code troubleshooting tree) and no additional faults become active, the repair has been validated.
- The fault code status displayed by the recommended Cummins electronic service tool or equivalent will change to INACTIVE immediately after the diagnostic runs and passes.
- The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
- The “Reset All Faults” command in the recommended Cummins electronic service tool or equivalent can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.
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 of this fault code include:
- 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.
Possible engine damage that causes excessive black soot to be generated.
- Excessive ash in the DPF
If Fault Code 2777 is active along with Fault Code 1921, this indicates that a regeneration inhibit message has been received by the engine ECM and that active regeneration of the aftertreatment diesel particulate filter was not permitted. Confirm that OEM settings for the aftertreatment permit switch are configured correctly. A stationary regeneration of the aftertreatment diesel particulate filter can be performed. Use the recommended Cummins electronic service tool or equivalent.
Troubleshooting Summary
- Check for primary fault codes
- Plugged EGR differential pressure sensor supply ports
- Restricted intake air filter
- Aftertreatment DPF differential pressure sensor tubes plugged
- Aftertreatment DPF differential pressure sensor stuck in-range
- Aftertreatment DPF partially obstructed or plugged
- Aftertreatment Diesel Particulate Filter Regeneration Analyzer Test
- ECM calibration revision history check
- Stationary aftertreatment regeneration is needed
Verification
Conditions
- Turn keyswitch ON.
- Connect the recommended Cummins electronic service tool or equivalent.
Action
- Use the recommended Cummins electronic service tool or equivalent to read the fault codes.
Specification
Before troubleshooting this fault code, troubleshoot any fault code that is active or has more than one inactive count within the last 25 engine operating hours from the following list:
- Aftertreatment regeneration: 2777, 3375, 3376, 4213, 6416
- Aftertreatment differential pressure: 1879, 1881, 1883, 1922
- Aftertreatment DPF: 1981, 2754, 3133, 3134, 3135, 3316, 3317, 3318, 3319, 3321, 3322, 3396, 5383
- Aftertreatment DOC: 3313, 3314, 3315
- Fuel: 559, 1139, 1141, 1142, 1143, 1144, 1145, 4713
- Engine misfire: 1654, 1655, 1656, 1657, 1658, 1659
- EGR: 1228, 1896, 2272, 2349, 2353, 2357, 2359, 2962, 3136, 3137, 3138, 3342, 3382, 3383, 3389
- EGR differential pressure: 1866, 2273, 2274
- Turbocharger: 1894, 1898, 2198, 2387, 2449, 2634, 2635, 2636, 3616
- Intake manifold: 125, 2973, 4616
- Intake throttle: 175, 176, 177, 3539, 3541, 3542, 5879, 5881, 5882
Linked Solutions
- None
Repair
- Perform a search on the appropriate fault codes.
Validation
- None
Verification
Conditions
- Turn keyswitch OFF.
Action
- Inspect the EGR differential pressure sensor flow port cross-drillings for soot blockage.
Specification
- If plugging or damage is found, then proceed to the Repair section.
Linked Solutions
- None
Repair
- Remove and clean the EGR mass measurement flow assembly.
Validation
- Connect all components
- Connect the recommended Cummins electronic service tool or equivalent.
- Disable the fault code.
- Operate the engine within the “Conditions for Clearing the Fault Code” found in the Overview section of the troubleshooting procedure.
- Verify that the fault code is no longer active.
- Check ECM Calibration Revision History
- Use the recommended Cummins electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revisions listed in the ECM Calibration Revision History Database for applicable changes related to this fault code.
- Refer to ECM Calibration Revision History Database.
Verification
Conditions
- Turn keyswitch OFF.
Action
- Visually inspect the air filter to make sure it is not plugged.
Specification
- If the intake air filter is plugged, then a restricted intake air filter has been detected.
Linked Solutions
- None
Repair
- Replace the air filter.
Refer to OEM Service Manual
Validation
- Connect all components
- Connect the recommended Cummins electronic service tool or equivalent.
- Disable the fault code.
- Operate the engine within the “Conditions for Clearing the Fault Code” found in the Overview section of the troubleshooting procedure.
- Verify that the fault code is no longer active.
- Check ECM Calibration Revision History
- Use the recommended Cummins electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revisions listed in the ECM Calibration Revision History Database for applicable changes related to this fault code.
- Refer to ECM Calibration Revision History Database.
Verification
Conditions
- Turn keyswitch OFF.
Action
- Inspect the aftertreatment DPF differential pressure sensor tubes for signs of damage, plugging, kinks, leakage or loose connections.
Specification
- If plugging or damage is found, then proceed to the Repair section.
Linked Solutions
- None
Repair
- Repair or replace DPF differential pressure sensor tubes.
Validation
- Connect all components
- Connect the recommended Cummins electronic service tool or equivalent.
- Disable the fault code.
- Operate the engine within the “Conditions for Clearing the Fault Code” found in the Overview section of the troubleshooting procedure.
- Verify that the fault code is no longer active.
- Check ECM Calibration Revision History
- Use the recommended Cummins electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revisions listed in the ECM Calibration Revision History Database for applicable changes related to this fault code.
- Refer to ECM Calibration Revision History Database.
Verification
Conditions
- Turn keyswitch ON.
- Connect the recommended Cummins electronic service tool or equivalent.
Action
- Use the recommended Cummins electronic service tool or equivalent.
- Monitor the aftertreatment DPF differential pressure sensor voltage.
Specification
- If the aftertreatment DPF differential pressure sensor voltage readings are not within specification, then a malfunctioning aftertreatment DPF differential pressure sensor has been detected.
Linked Solutions
- None
Repair
- Replace aftertreatment DPF differential pressure sensor.
Validation
- Connect all components
- Connect the recommended Cummins electronic service tool or equivalent.
- Disable the fault code.
- Operate the engine within the “Conditions for Clearing the Fault Code” found in the Overview section of the troubleshooting procedure.
- Verify that the fault code is no longer active.
- Check ECM Calibration Revision History
- Use the recommended Cummins electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revisions listed in the ECM Calibration Revision History Database for applicable changes related to this fault code.
- Refer to ECM Calibration Revision History Database.
Verification
Conditions
- Turn keyswitch ON.
- Connect the recommended Cummins electronic service tool or equivalent.
Action
- If the aftertreatment DPF has already been replaced during this repair, then proceed to the next solution.
- Use the recommended Cummins electronic service tool or equivalent.
- Perform the Aftertreatment Diesel Particulate Filter Automated Restriction Test.
Specification
- If the Aftertreatment Diesel Particulate Filter Automated Restriction Test exceeds the limits called out in procedure, then a plugged or restricted aftertreatment DPF has been detected.
Linked Solutions
- None
Repair
- Replace aftertreatment DPF.
Validation
- Connect all components
- Connect the recommended Cummins electronic service tool or equivalent.
- Disable the fault code.
- Operate the engine within the “Conditions for Clearing the Fault Code” found in the Overview section of the troubleshooting procedure.
- Verify that the fault code is no longer active.
- Check ECM Calibration Revision History
- Use the recommended Cummins electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revisions listed in the ECM Calibration Revision History Database for applicable changes related to this fault code.
- Refer to ECM Calibration Revision History Database.
Verification
Conditions
- Reconnect previously disconnected components.
- Turn keyswitch ON.
- Connect the recommended Cummins electronic service tool or equivalent.
Action
- Use the recommended Cummins electronic service tool or equivalent.
- Perform the Aftertreatment Diesel Particulate Filter Regeneration Analyzer Test.
- Verify the recommended Cummins electronic service tool or equivalent has a version that supports this test.
Specification
- If the Aftertreatment Diesel Particulate Filter Regeneration Analyzer Test does not pass, then reset the search to Aftertreatment Diesel Particulate Filter Regeneration Analyzer Did Not Pass. Only select the solution title that matches the error messages in the recommend Cummins electronic service tool or equivalent.
- If the Aftertreatment Diesel Particulate Filter Regeneration Analyzer Test will not start, then reset the search to Aftertreatment Diesel Particulate Filter Regeneration Analyzer Did Not Start.
- If the Aftertreatment Diesel Particulate Filter Regeneration Analyzer Test does not complete, then reset the search to Aftertreatment Diesel Particulate Filter Regeneration Analyzer Did Not Complete.
Linked Solutions
- None
Repair
- No additional action is required for this solution.
Validation
- None
8 – ECM calibration revision history check
Verification
Conditions
- Connect all components.
- Turn keyswitch ON.
- Connect the recommended Cummins electronic service tool or equivalent.
Action
- Use the recommended Cummins electronic service tool or equivalent to read the fault codes.
- Use the recommended Cummins electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revision listed in the ECM calibration revision history for applicable changes.
Specification
- If a calibration update for this fault code is available, the ECM calibration revision must be that revision or higher.
Linked Solutions
- None
Repair
- Prior to downloading the ECM calibration, check to see that all job images and all other troubleshooting has been documented as downloading an ECM calibration will remove the fault codes on the ECM.
- Download the updated ECM calibration code.
Validation
- Connect all components
- Connect the recommended Cummins electronic service tool or equivalent.
- Disable the fault code.
- Operate the engine within the “Conditions for Clearing the Fault Code” found in the Overview section of the troubleshooting procedure.
- Verify that the fault code is no longer active.
- Check ECM Calibration Revision History
- Use the recommended Cummins electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revisions listed in the ECM Calibration Revision History Database for applicable changes related to this fault code.
- Refer to ECM Calibration Revision History Database.
Verification
Conditions
- Turn keyswitch ON.
- Connect the recommended Cummins electronic service tool or equivalent.
Action
- Use the recommended Cummins electronic service tool or equivalent to read the fault codes.
- Check to make sure no other fault codes are active.
Specification
- If other fault codes that inhibit the aftertreatment stationary regeneration are active or inactive with more than one count within the last 25 engine operating hours, then troubleshoot those fault codes before performing the aftertreatment stationary regeneration procedure.
- If there are no other fault codes active or inactive with more than one count within the last 25 engine operating hours that inhibit the aftertreatment stationary regeneration, then proceed directly to performing the aftertreatment stationary regeneration.
Linked Solutions
- None
Repair
- Inform the customer on the proper procedure for initiating a stationary regeneration.
- Some vehicles can be equipped with a stationary regeneration switch in the dash. This switch can also be used to perform the stationary regeneration procedure. Refer to the manufacturer’s operating instructions.
Validation
- Connect all components
- Connect the recommended Cummins electronic service tool or equivalent.
- Disable the fault code.
- Operate the engine within the “Conditions for Clearing the Fault Code” found in the Overview section of the troubleshooting procedure.
- Verify that the fault code is no longer active.
- Check ECM Calibration Revision History
- Use the recommended Cummins electronic service tool or equivalent to find the current ECM code and revision number in the ECM.
- Compare the ECM code and revision number in the ECM to the calibration revisions listed in the ECM Calibration Revision History Database for applicable changes related to this fault code.
- Refer to ECM Calibration Revision History Database.
If all steps have been completed and no root cause has been identified, then follow the technical escalation process.