Overview
| CODE | REASON | EFFECT |
| Fault Code: 3225 PID: SPN: 3490 FMI: 7/7 LAMP: Amber SRT: |
Aftertreatment Purge Air Actuator – Mechanical System Not Responding or Out of Adjustment.A stuck closed aftertreatment purge air actuator has been detected
|
Possible reduced engine performance. |
Circuit Description
The aftertreatment purge air actuator is used to purge the aftertreatment fuel injector system of fuel after active regeneration of the aftertreatment diesel particulate filter.
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 Engine Control Module (ECM) detected the aftertreatment fuel pressure was less than a threshold when the aftertreatment purge air actuator was commanded on.
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.
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:
A stuck closed aftertreatment purge air actuator
Missing or leaking air supply line to the aftertreatment purge air actuator
Missing or leaking air supply line from the aftertreatment purge air actuator to the shutoff valve manifold.
Troubleshooting Summary
Solution: S00000244
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: 1926, 1927, 1928, 3223, 3224
Linked Solutions
- None
Repair
- Perform a search on the appropriate fault codes.
Validation
- None
Solution: S00003178
Verification
Conditions
- Turn keyswitch OFF.
Action
- Drain the air supply tank.
Refer to OEM Service Manual
- Disconnect the OEM air supply line to the aftertreatment purge air actuator.
- Run the engine at idle for the following minutes: 5
- Confirm air flow from OEM air supply to the aftertreatment purge air actuator.
Specification
- If air is weak or not present, then a malfunction of the OEM air plumbing has been detected.
- If air is present, then proceed to the Linked Solutions section.
Linked Solutions
- Aftertreatment purge air actuator check
- Aftertreatment fuel shut off valve manifold check
Repair
Repair or replace only the components that were found to be out of specification.
- Repair or replace the OEM air plumbing.
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.
Solution: S00002841
Verification
Conditions
- Turn keyswitch OFF.
- Reconnect previously disconnected components.
- Disconnect the air supply line from the aftertreatment fuel shutoff manifold.
Action
- Turn keyswitch ON.
- Run the engine at idle for the following minutes: 5
- Allow the air pressure to stabilize for one minute.
- Connect the recommended Cummins® electronic service tool or equivalent.
- Use the recommended Cummins® electronic service tool or equivalent.
- Select the Aftertreatment Shutoff Valve and Injector Override Test found under ECM Diagnostic Tests.
- Perform the Aftertreatment Fuel Injector Leak Test.
- Turn keyswitch OFF.
After turning the keyswitch OFF the aftertreatment fuel system purge cycle will begin, and air will flow from the air supply line to the aftertreatment fuel shutoff valve manifold.
Specification
- If air is weak or not present at the air supply line to the aftertreatment fuel shutoff manifold, then a stuck closed aftertreatment purge air actuator has been detected.
Linked Solutions
- None
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: S00002984
Verification
Conditions
- Turn keyswitch OFF.
Action
- Reconnect the air supply line to the aftertreatment fuel shutoff manifold.
- Remove the aftertreatment fuel injector.
- Turn keyswitch ON.
- Connect the recommended Cummins® electronic service tool or equivalent.
- Run the engine at idle for the following minutes: 5
- Use the recommended Cummins® electronic service tool or equivalent.
- Select the Aftertreatment Shutoff Valve and Injector Override Test found under ECM Diagnostic Tests.
- Perform the Aftertreatment Fuel Injector Leak Test.
- Turn keyswitch OFF.
After turning the keyswitch OFF the aftertreatment fuel system purge cycle will begin, and air will flow from the air supply line to the aftertreatment fuel shutoff valve manifold.
Specification
- If air is weak or not present at the aftertreatment fuel injector, then a malfunctioning aftertreatment fuel shutoff valve manifold has been detected.
Linked Solutions
- None
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: S00000761
Verification
Conditions
- Turn keyswitch OFF.
Action
- Visually inspect for the presence of the aftertreatment DOC.
- Inspect the inlet face of the aftertreatment DOC for reuse.
Refer to Service Bulletin 4021600
- Inspect for cracks in the aftertreatment DOC cell walls.
Refer to Service Bulletin 4021600
- Inspect for soot or oil plugging the front face of the catalyst
Specification
- If plugging or damage is found, then proceed to the Repair section.
- If the face of the aftertreatment diesel oxidation catalyst is cracked or damaged, then proceed to Repair section.
Linked Solutions
- None
Repair
Repair or replace only the components that were found to be out of specification.
- If the face of the aftertreatment DOC is plugged, then clean the aftertreatment DOC.
- If the face of the aftertreatment DOC is cracked or damaged, then replace the aftertreatment DOC.
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: S00001427
Verification
Conditions
- None
Action
- Verify all preceding solution verifications for this fault code have been performed.
Specification
- If the fault code is still active or inactive with more than one count within the last 25 engine hours and all the preceding solution verifications have been performed, then a malfunctioning aftertreatment fuel shutoff manifold has been detected.
Linked Solutions
- None
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.