Citroen C5 DCM3.4 EGR OFF

[benjiislo]

Hey, I have citroen c5 III. 2.0hdi RHR. Can someone disable EGR. Thanks!

[CliffRogel]

To disable the EGR (Exhaust Gas Recirculation) system on a Citroën C5 equipped with a DCM3.4 ECU, you'll need to modify the ECU software. Disabling the EGR can lead to better engine performance and prevent certain issues related to the EGR system, such as clogging or poor emissions performance. However, it's essential to note that this modification might affect emissions compliance and could be illegal in some regions.
Steps to Perform EGR OFF on Citroën C5 DCM3.4 ECU:

1. ECU Readout:
   
   
   • Connect your vehicle to a diagnostic tool capable of reading the ECU, such as KESS, KTAG, or another suitable OBD tool.
   • Read the full ECU data and save the original file as a backup.
   
   
2. Modify the ECU File:
   
   
   • Use ECU tuning software (such as WinOLS, ECM Titanium, or another specialized tool) to open the ECU file.
   • Locate the EGR maps or control parameters. This usually involves identifying specific map addresses or routines related to EGR operation.
   • Modify the parameters to disable EGR function:
     
     • Zero out the EGR maps.
     • Disable any associated diagnostic trouble codes (DTCs) related to the EGR system.
     
     
   • Save the modified file.
   
   
3. Write the Modified File:
   
   
   • Load the modified file back into the ECU using the same tool used for reading.
   • Ensure the write process completes successfully without errors.
   
   
4. Verification:
   
   
   • After writing the modified file, disconnect the tool and start the engine.
   • Use a diagnostic scanner to ensure there are no active DTCs related to the EGR system.
   • Test drive the vehicle to confirm proper operation without EGR issues.

Important Considerations:

• Legal Implications: Disabling the EGR system might lead to legal and environmental consequences, particularly regarding emissions standards. Ensure you understand the regulations in your region before proceeding.
  
• Professional Assistance: If you are not experienced with ECU tuning, it's recommended to seek help from a professional tuner to avoid potential damage to your vehicle's ECU or engine.
  
• Backup: Always keep a backup of the original ECU file in case you need to revert to the factory settings.

By following these steps, you can successfully disable the EGR system on a Citroën C5 with a DCM3.4 ECU.