For auto repair professionals at shops like A-1 General Auto Repair looking to elevate their expertise, specializing in diesel engine diagnostics is a crucial step. Modern medium- and heavy-duty trucks rely on sophisticated electronic diesel engine systems, demanding specialized knowledge for accurate and efficient repairs. The Electronic Diesel Engine Diagnosis Specialist (L2) certification is designed to validate and recognize technicians who possess these advanced skills.
This rigorous test assesses a technician’s ability to diagnose complex performance issues in diesel engines. The L2 exam covers a broad spectrum of critical areas, including general diesel engine principles, intricate electronic diesel engine controls, air induction and exhaust systems, and various diesel fuel systems. Notably, it delves into specific, advanced fuel systems like High Pressure Common Rail (HPCR), electronic unit injector (EUI), and hydraulic electronic unit injector (HEUI) systems, reflecting the technology found in today’s vehicles. Given the depth and complexity of the L2 test, it is recommended to focus solely on this certification during a testing session to ensure optimal performance.
Many questions within the L2 test are designed around a composite vehicle, representing a blend of electronic diesel engine control technologies used across different engine manufacturers. Detailed information about this composite system is available in the Medium-Heavy Composite Vehicle Type 4 Reference Booklet. Technicians are encouraged to download and thoroughly review this booklet prior to taking the L2 test to familiarize themselves with the system and enhance their preparation.
To be eligible for the standard L2 certification test, candidates must have already achieved foundational certifications. A prerequisite for the L2 exam is passing one ASE Diesel Engine test (A9, H2, S2, or T2) in conjunction with one ASE Electrical/Electronic Systems test (A6, H6, S6, or T6). For technicians seeking to renew their specialist status, the recertification version, Electronic Diesel Engines Diagnosis Specialist Test (L2R), is available, provided they have previously passed the regular L2 test.
Maintaining certification as an Electronic Diesel Engine Diagnosis Specialist requires ongoing professional development. Recertification is necessary every five years to ensure technicians remain current with the rapidly evolving technology in diesel engine diagnostics. The Advanced Diesel Engine Diagnosis Specialist recertification test (L2R) mirrors the length and rigor of the initial certification exam, upholding the high standards of ASE certification.
To aid in preparation, ASE provides valuable study resources. The Advanced Diesel Engine Diagnosis Specialist Study Guide offers test specifications, task lists, sample questions, and recommended training materials. Furthermore, the Medium-Heavy Composite Vehicle Type 4 Reference Booklet serves as an essential resource for understanding the composite electronic diesel engine control system featured in many of the L2 test questions. For A-1 General Auto Repair and similar businesses, investing in L2 certification for their technicians signifies a commitment to expert service and advanced diagnostic capabilities in the diesel repair sector.
