Overview
| CODE | REASON | EFFECT |
| Fault Code: 3575 PID: SPN: 4334 FMI: 0/16 LAMP: Amber SRT: |
The diesel exhaust fluid dosing unit has detected a blockage in the diesel exhaust fluid return flow.
|
Possible reduced engine performance. |
Circuit Description
The Engine Control Module (ECM) provides a 5 volt supply and a ground to the aftertreatment diesel exhaust fluid pressure sensor. The pressure sensor provides a signal to the ECM on the sensor signal circuit. This sensor signal voltage changes, based on the aftertreatment diesel exhaust fluid pressure supplied by the dosing unit. The ECM will detect a low signal voltage at low diesel exhaust fluid pressures, and a high signal voltage at high diesel exhaust fluid pressures.
Component Location
The aftertreatment diesel exhaust fluid pressure sensor is internal to the aftertreatment diesel exhaust fluid dosing unit and can not be serviced separately.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.
Conditions for Setting the Fault Codes
The aftertreatment diesel exhuast fluid controller has detected that the diesel exhaust fluid pressure in the dosing unit is above 1250 kpa [181 psi] for more than 20 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.
Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.
Engine torque will be severely reduced.
Vehicle speed will be limited to 8 km [5 mi] per hour after extended engine operation with the fault code active.
Conditions for Clearing the Fault Code
- To validate the repair, perform the «Aftertreatment Diesel Exhaust Fluid Doser Pump Override Test» found under «ECM Diagnostic Tests» in the recommended Cummins® electronic service tool or equivalent.
- 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
Troubleshoot other active SCR related faults before this fault.
Possible causes of this fault code include:
Blocked, restricted, or frozen diesel exhaust fluid dosing unit return line or return line fitting
Malfunctioning diesel exhaust fluid dosing unit.
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring supplied by the OEM.
For intermittent power supply and datalink communication issues with Aftertreatment Components, it is highly recommended that the OEM Power Distribution Center fuses and relays be thoroughly checked for loose, missing or intermittent connections.
Troubleshooting Summary
Solution: S00001761
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 diesel exhaust fluid system: 1673, 3497, 3498, 3565, 3566, 3567, 3568, 3571, 3572, 3577, 3578, 3579
- Aftertreatment diesel exhaust fluid dosing unit: 1681, 3612, 3679
Linked Solutions
- None
Repair
- Perform a search on the appropriate fault codes.
Validation
- None
Solution: S00000664
Verification
Conditions
- Turn keyswitch OFF.
Action
- Verify the lines are not swapped at the dosing unit, dosing valve or diesel exhaust fluid tank connections.
- Visually inspect the aftertreatment diesel exhaust fluid tank connections for cracks or pitting.
- Visually inspect the aftertreatment diesel exhaust fluid tank vent line for restrictions.
- Visually inspect the aftertreatment diesel exhaust fluid line for damage.
- Visually inspect both dosing unit connections and fittings for loose, leaking, or damaged connections.
- Disconnect the suction line and pressure line dosing unit connectors and look for signs of build-up or blockage.
- Inspect the aftertreatment diesel exhaust fluid dosing unit inlet connector screen.
- Visually inspect the suction line for signs of leakage or openings which will allow the dosing unit to suck in air with the diesel exhaust fluid.
- Visually inspect the pressure line for signs of leakage or rupture.
- Verify proper sealing at all connection points, including diesel exhaust fluid tank, dosing unit, and dosing valve.
Specification
- If there are aftertreament diesel exhaust fluid lines reversed, damaged, leaking or restricted connections found, then proceed to the Repair section.
Linked Solutions
- None
Repair
- Repair or replace damaged components.
Refer to OEM Service Manual
- Replace the aftertreatment diesel exhaust fluid dosing unit inlet connector screen.
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: S00000967
Verification
Conditions
- Turn keyswitch OFF.
Action
- Perform the Aftertreatment Diesel Exhaust Fluid Doser Pump Override Test.
Specification
- If the Aftertreatment Diesel Exhaust Fluid Doser Pump Override Test is not within specification, then proceed to the Repair section.
Linked Solutions
- None
Repair
- Clean or replace the aftertreatment diesel exhaust fluid dosing valve.
Validation
- 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.
- Connect all components
- Connect the recommended Cummins® electronic service tool or equivalent.
- 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.
Solution: S00000443
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.
Solution: S00001431
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 diesel exhaust fluid dosing unit 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.