Overview
| CODE | REASON | EFFECT |
| Fault Code: 2881 PID: S332 SPN: 3480 FMI: 1/17 LAMP: Amber SRT: |
Low fuel pressure has been detected in the aftertreatment fuel system.
|
None on performance. |
Circuit Description
The aftertreatment fuel pressure sensor is used to monitor the fuel pressure into the aftertreatment system. The engine control module (ECM) supplies the aftertreatment fuel pressure sensor a 5 volt reference voltage. When the fuel pressure is low, the sensor signal voltage is low. When the fuel pressure is high, the sensor signal voltage is near the 5 volt reference voltage. The ECM monitors the aftertreatment fuel pressure signal circuit voltage to calculate the pressure of the fuel within the aftertreatment system.
Component Location
The aftertreatment fuel injector is installed in the exhaust system in the turbocharger adapter pipe. The aftertreatment fuel pressure sensor and aftertreatment fuel shutoff valve are installed in the shutoff valve manifold. The aftertreatment purge air actuator is located above the shutoff valve manifold.
Conditions for Running the Diagnostics
This diagnostic runs during active regeneration of the aftertreatment diesel particulate filter.
Conditions for Setting the Fault Codes
The aftertreatment fuel pressure was less than 300 kPa [43.5 psi] for more than 15 seconds.
Action Taken When the Fault Code is Active
- The ECM illuminates the amber CHECK ENGINE lamp and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
- Active regeneration of the aftertreatment diesel particulate filter will be disabled unitl the next key cycle.
- Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.
Conditions for Clearing the Fault Code
- To validate the repair, start the engine and perform the recommended Cummins® electronic service tool or equivalent Aftertreatment Diesel Particulate Filter Regeneration Test.
- 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.
- For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where 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.
Shop Talk
Possible causes of this fault code include:
- Plugged or restricted aftertreatment fuel shutoff manifold
- Plugged or restricted aftertreatment fuel supply line
- Malfunctioning or damaged aftertreatment fuel shutoff valve.
- Malfunctioning or damaged aftertreatment fuel drain valve.
- Malfunctioning or damaged aftertreatment fuel injector.
Troubleshooting Summary
Solution: S00000221
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 fuel: 1923, 1924, 1925, 1926, 1927, 1928, 1932, 1963, 1977, 3223, 3224, 3225.
- Fuel: 559, 2372
Linked Solutions
- None
Repair
- Perform a search on the appropriate fault codes.
Validation
- None
Solution: S00002823
Verification
Conditions
- Turn keyswitch OFF.
Action
- Remove the aftertreatment fuel injector.
- Turn keyswitch ON.
- Connect the recommended Cummins® electronic service tool or equivalent.
- Start the engine.
- Use the recommended Cummins® electronic service tool or equivalent.
- Perform the Aftertreatment Fuel Injector Leak Test.
- Visually inspect the aftertreatment fuel system for external fuel leaks.
Specification
- If there are any leaks found in the aftertreatment fuel system, then proceed to the Repair section.
Linked Solutions
- None
Repair
Repair or replace only the components that were found to be out of specification.
- Clean or replace the aftertreatment fuel injector.
- Replace aftertreatment fuel shutoff valve.
- Replace aftertreatment fuel drain valve.
- Replace the aftertreatment fuel supply line.
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.
Solution: S00002871
Verification
Conditions
- Turn keyswitch OFF.
Action
- Remove the aftertreatment fuel shutoff manifold.
- Remove the aftertreatment fuel supply line between the fuel rifle and the aftertreatment fuel shutoff manifold.
- Visually inspect the aftertreatment fuel shutoff manifold inlet, outlet and fuel drain ports for debris.
- Visually inspect the aftertreatment fuel supply line for plugging or restrictions.
- Visually inspect the fuel rifle port for plugging or restrictions.
Specification
- If debris is found in the aftertreatment fuel shutoff manifold, then proceed to the Repair section.
- If debris is found in the aftertreatment fuel supply line, then proceed to the Repair section.
Linked Solutions
- None
Repair
Repair or replace only the components that were found to be out of specification.
- Clean or replace the aftertreatment fuel shutoff manifold.
- Replace the aftertreatment fuel supply line.
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.