FAULT CODE 2349
EGR Valve Control Circuit – Current Below Normal or Open Circuit
Overview
| CODE | REASON | EFFECT |
| Fault Code: 2349 PID: S146 SPN: 2791 FMI: 5/5 LAMP: Amber SRT: |
Motor terminal or motor coil open circuit has been detected by the ECM.
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Possible reduced engine performance.
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EGR Valve Circuit
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Circuit Description
The exhaust gas recirculation (EGR) valve is controlled by a brushless motor located on top of the EGR valve. The EGR valve motor uses three different motor legs to move the valve through its range of motion. The ECM uses the EGR motor A, B, and C wires to command the EGR valve to the appropriate position in order to meet EGR flow targets.The EGR valve motor contains three position sensors that detect the location of the EGR valve. These sensors report the position of the valve back to the ECM over the EGR valve position A, B, and C wires.
The EGR valve motor contains three position sensors that detect the location of the EGR valve. These sensors report the position of the valve back to the ECM over the EGR valve position A, B, and C wires.
Component Location
The EGR Valve and EGR Differential Pressure Sensor location varies depending on engine model.
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 Engine Control Module (ECM) detected an open circuit in the engine wiring harness or EGR valve motor coil.
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.
Exhaust gas recirculation (EGR) valve operation will be disabled.
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 using a Diagnostic Road Test, utilize a route that incorporates both stop and go city type driving and steady state highway type driving. It may be necessary to load the unit for certain diagnostics in the ECM to run.
- To validate the repair using a Chassis Dynamometer, utilize a routine that incorporates acceleration and motoring events, steady state highway type operation, and load. This will simulate normal driving and allow the diagnostics in the ECM to run.
- The fault code status displayed by INSITE electronic service tool 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 INSITE electronic service tool 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:
EGR motor circuit open circuit
Open circuit in the wiring harness
Malfunctioning ECM.
Troubleshooting Summary
Verification
Conditions
- Turn keyswitch OFF.
- Disconnect the EGR valve motor from the engine wiring harness.
Action
- Inspect the pins and connectors for damage.
- Measure the resistance between the EGR valve motor wire A pin, to the EGR valve motor wire B pin in the EGR valve motor.
- Measure the resistance between the EGR valve motor wire A pin, to the EGR valve motor wire C pin in the EGR valve motor.
- Measure the resistance between the EGR valve motor wire C pin, to the EGR valve motor wire B pin in the EGR valve motor.
- Refer to the circuit diagram or wiring diagram for connector pin identification.
Specification
- A malfunctioning EGR valve motor has been detected if the resistance is greater than the following specification: 5 Ω
Linked Solutions
- None
Repair
- Replace the EGR valve.
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.
- Disconnect the engine wiring harness connector from the ECM.
- Disconnect the EGR valve from the engine wiring harness.
Action
- Inspect the pins and connectors for damage.
- Measure the resistance between the EGR valve motor A SIGNAL pin at the EGR valve engine wiring harness connector and the EGR valve motor A SIGNAL pin at the engine wiring harness ECM connector.
- Measure the resistance between the EGR valve motor B SIGNAL pin at the EGR valve engine wiring harness connector and the EGR valve motor B SIGNAL pin at the engine wiring harness ECM connector.
- Measure the resistance between the EGR valve motor C SIGNAL pin at the EGR valve engine wiring harness connector and the EGR valve motor C SIGNAL pin at the engine wiring harness ECM connector.
- Measure the resistance between the EGR valve motor RETURN pin at the EGR valve engine wiring harness connector and the EGR valve motor RETURN pin at the engine wiring harness ECM connector.
- Refer to the circuit diagram or wiring diagram for connector pin identification.
Specification
- A malfunctioning engine wiring harness has been detected if the resistance is greater than the following specification: 10 Ω
Linked Solutions
- None
Repair
- Repair or replace the engine wiring harness.
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
- 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 proceed to the Repair section.
Linked Solutions
- None
Repair
If the EGR valve has been replaced within the last 90 days, follow your technical escalation process PRIOR to performing any of the repair actions listed below:
- Replace the EGR valve.
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.