Electronic Diesel Engine Diagnosis Specialist

Objective: To identify those Technicians who possess knowledge of the skills necessary to diagnose sophisticated diesel engine performance problems on medium- and heavy-duty trucks. Test Content: The Electronic Diesel Engine Diagnosis Specialist (L2) test contains 45 questions focused on the diagnosis of general diesel engine, electronic diesel engine controls, diesel engine air induction and exhaust systems, diesel fuel systems, and specific fuel systems, including High Pressure Common Rail (HPRC), electronic unit injector (EUI) and hydraulic electronic unit injector (HEUI) systems. Because of the complexity of the L2 test, ASE generally recommends that you NOT register for other tests during the same test session. Composite Vehicle: Many of the questions relate to a sample vehicle equipped with a composite diesel engine control system featuring a cross-section of electronic diesel engine control technology used by all engine manufacturers. This vehicle is described in the Medium-Heavy Composite Vehicle Type 4 Reference document that is provided as an electronic pop-up during the test. Use the link below to download and review this document prior to taking the L2 test. Prerequisite: To register for the regular L2 certification test, you must have passed one of the ASE Diesel Engine tests (A9, H2, S2, or T2) and one of the ASE Electrical/Electronic Systems tests (A6, H6, S6 or T6). To register for the recertification version of the Electronic Diesel Engines Diagnosis Specialist Test (L2R), you must have previously passed the regular L2 test. Recertification: Technicians must retest every five years to retain their certification. The Advanced Diesel Engine Diagnosis Specialist recertification test (L2R) is the same length as the regular certification test.