Function of AdBlue Pump in Vehicles
The AdBlue pump is a critical component in Selective Catalytic Reduction (SCR) systems. It pressurizes and delivers urea solution (AdBlue) from the tank to the exhaust system, where it reacts with nitrogen oxides (NOx) in the exhaust gas. This chemical reaction converts harmful NOx emissions into harmless nitrogen gas and water vapor, ensuring compliance with emission regulations. The pump’s operation is controlled by the Engine Control Module (ECM), which monitors parameters like urea pressure and injection timing.
Replacement and Maintenance Procedures
Safety Precautions
Wear protective gloves and eyewear to avoid skin/eye contact with urea.
Depressurize the AdBlue system using diagnostic tools to prevent accidental fluid release.
Diagnostic Checks
Use professional diagnostic equipment to identify pump-related faults (e.g., low pressure, electrical issues).
Inspect for crystallization in the pump or lines, which may require cleaning before replacement.
Pump Replacement Steps
Drain the AdBlue Tank: Remove urea solution to avoid spillage.
Disconnect Components: Detach electrical connectors, hoses, and mounting bolts from the pump.
Install New Pump: Secure the replacement pump, ensuring proper alignment and sealing.
Refill and Prime: Add fresh AdBlue and use diagnostic tools to prime the system, verifying pressure (target ≈5 Bar).
Post-Replacement Testing
Perform an SCR system reset via the ECM.
Conduct a road test to confirm normal pump operation and absence of warning lights.
Key Notes
Replacement requires specialized tools and expertise; professional assistance is recommended.
Regular maintenance (e.g., using high-quality urea, avoiding contamination) extends pump lifespan.
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