= System is having to 'add' AdBlue to maintain NOx catalyst efficiency = Default value after a reset (center-line value) Select Measuring Value Block group( MVB), press [Go!Įvaluation of MVB-183, field (1) - Learned SCR adaptations values: Special Notes: Follow the workshop manual and all safety precautions when working with the vehicle and when handling Diesel exhaust fluid (AdBlue)! Prerequisites: Key on, Engine off and the use of a proper Battery Maintainer is required, test will run 10 or more minutes. Special tools: VAS-6532 (or a clear plastic container) Required time for test: About 20-30 minutes This test should be completed if you have:Ĭomponent to be tested: N474-Reducing Agent InjectorĬomponent location: Exhaust, upstream of NOx catalyst We strongly recommend to check the SCR (Selective Catalytic Reduction) adaptation values before clearing any codes or testing, this will let you know if the Engine controller is either 'adding' or 'taking away' the amount of AdBlue that is being injected into the system. During this test the output of AdBlue from the N474-Reducing Agent Injector will be tested and measured. Below is the procedures for non- UDS controllers, please follow all additional instructions, warnings, etc found in the Official Factory Repair Manuals. Sometimes it will be necessary to test the N474-Reducing Agent Injector.
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