Overview
| CODE | REASON | EFFECT |
| Fault Code: 1964 PID: S382 SPN: 3556 FMI: 7/7 LAMP: Amber SRT: |
An internal or external fuel leak has been detected in the aftertreatment fuel system.
|
Possible reduced engine performance. |
Circuit Description
Before active regeneration of the aftertreatment diesel particulate filter, a diagnostic test on the system is performed. The aftertreatment fuel injector opens and relieves fuel pressure in the line. The aftertreatment fuel pressure sensor must be reading atmospheric pressure at this point in the test. The aftertreatment fuel injector closes and the aftertreatment purge air actuator opens. This pressurizes the aftertreatment fuel system to vehicle air pressure. The diagnostic then checks to make sure the aftertreatment fuel pressure sensor is reading vehicle air pressure. The aftertreatment fuel shutoff valve then opens and allows pressurized fuel to enter the system. The aftertreatment fuel injector then opens and primes the system by purging the air from the line. The aftertreatment fuel shutoff valve and aftertreatment fuel injector then close and trap the fuel between the aftertreatment fuel shutoff valve and the aftertreatment fuel injector. The diagnostic checks to make sure the system maintains fuel pressure.
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 a leaking aftertreatment fuel injector or an external leak.
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:
A stuck open or leaking aftertreatment fuel injector
An external leak in the aftertreatment fuel injector system.
A leaking aftertreatment fuel shutoff manifold
Troubleshooting Summary
Solution: S00000174
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
- Fuel: 559, 2372
Linked Solutions
- None
Repair
- Perform a search on the appropriate fault codes.
Validation
- None
Solution: S00003257
Verification
Conditions
- 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 Maintenance Reset All procedure found under the Aftertreatment Maintenance Section of Advanced ECM Data.
Performing the Aftertreatment Maintenance Reset All may cause the fault code to go inactive. This does not mean that the issue was resolved, only that the efficiencies were reset. Troubleshooting must be continued.
- Perform the Aftertreatment Fuel Injector Flow Test.
Specification
- If the Aftertreatment Fuel Injector Flow Test does not meet specification, then a malfunctioning aftertreatment fuel injector has been detected.
Linked Solutions
- None
Repair
- Clean or replace the aftertreatment fuel injector.
- Perform the Aftertreatment Stationary Regeneration procedure.
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: S00002968
Verification
Conditions
- Turn keyswitch OFF.
- Disconnect the aftertreatment fuel supply line from the aftertreatment fuel injector.
- Disconnect the air supply line from the aftertreatment fuel shutoff manifold.
- Connect the fuel extension line.
- Place the end of the line in an empty fuel container.
- 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 fuel pressure.
Specification
- A malfunctioning aftertreatment fuel pressure sensor has been detected If the recommended Cummins® electronic service tool or equivalent reading are not within the following specification: 77 mm-Hg [3 in-hg / 1.5 psi]
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: S00003052
Verification
Conditions
- Disconnect the aftertreatment fuel supply line from the aftertreatment fuel injector.
- Connect the fuel extension line.
- Turn keyswitch ON.
- Engine running at idle.
Action
- Check for a stuck open or leaking aftertreatment fuel shutoff valve.
- Check for a leaking aftertreatment fuel injector supply line extension.
Specification
- If fuel is leaking from the aftertreatment fuel shutoff valve or aftertreatment fuel injector supply line extension, then a malfunctioning aftertreatment fuel shutoff valve 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.