ASE L2 Electronic Diesel Engine Diagnosis guide exam help

ASE L2 Electronic Diesel Engine Diagnosis Specialist is an advanced-level test for medium- and heavy-vehicle technicians who diagnose sophisticated engine performance problems on computer-controlled diesel engines. ASE requires regular L2 candidates to be currently certified in both Diesel Engines (A9, T2, S2, or H2) and Electrical/Electronic Systems (A6, T6, S6, or H6), and certification also requires 3 years of relevant experience. ASE's L2 guide lists the certification appointment as 55 total questions in 2 hours, including 45 scored multiple-choice questions and 10 unscored research questions; the L2R recertification test has 45 questions and 2 hours. Questions may use the Medium/Heavy Composite Vehicle Type 4 reference, an HPCR diesel system with sensors, actuators, emission controls, and control logic that appears electronically during the test. The scored blueprint covers General Inspection and Diagnosis (4 questions, 10%), Electronic Engine Controls Diagnosis (18, 40%), Air Induction Systems Diagnosis (6, 13%), Fuel Systems Diagnosis (8, 18%), and Emissions Systems Diagnosis (9, 19%). Preparation should emphasize DTCs, freeze-frame and live data, ECM data, DMM/DSO tests, data bus communication, HPCR/HEUI/EUI fuel systems, turbocharger and wastegate controls, air restriction and leakage tests, DOC, SCR, DEF, DPF, regeneration, EGR, crankcase ventilation, no-start and derate diagnosis, and root-cause verification.