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Wabco Urea Water Pump

Simply Just, Simply SUNJIN

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What is a Urea Pump?

An AdBlue dosing pump unit, mainly used in MAN Euro 6 compliant trucks.
It is a key actuator in the SCR system, designed to inject urea solution (32.5% aqueous urea) into the exhaust stream to reduce NOₓ emissions.

Main Functions & Operating Principle

  • Precise Urea Injection Urea is injected into the exhaust flow, decomposed into ammonia → reduces NOₓ into nitrogen and water.

  • Priming, Dosing, Purging, and Stop Control The pump’s internal ECM executes multi-stage operating logic.

  • Fine Atomization Injects in fine particles to maximize SCR reaction efficiency and minimize carbon deposits.

Failure & Maintenance Information

  • Failure Symptoms
  • AdBlue warning light ON, reduced SCR efficiency, engine power limitation, DTC generation.
  • Maintenance Items
  • Check pump motor/bearings.
  • Nozzle clogging → clean or replace.
  • Check harness and connectors for missing or damaged pins (e.g., 18-way / square-plug type).
  • ECM response failure → reset ECM or replace with rebuilt pump.