L2
5
225
55 questions (45 scored)
120 minutes
Not published by ASE (scaled score, pass/fail result)
Multiple choice
General Inspection and Diagnosis | Verifying concerns, exhaust smoke analysis, cooling, lubrication, engine noises, engine and exhaust brakes, no-start and low-power diagnosis (10%) Electronic Engine Controls Diagnosis | DTCs and live data, DMM and oscilloscope testing, sensor and actuator circuits, J1939 data link, interrelated systems and repair verification (40%) Air Induction Systems Diagnosis | Intake restriction and leak tests, air temperature, flow and pressure sensors, turbochargers and VGT controls, cold-start aids (13%) Fuel Systems Diagnosis | Air in fuel, contamination, supply pressure and restriction, return rates, electronic throttle, HPCR, HEUI and EUI systems (18%) Emissions Systems Diagnosis | Exhaust leaks and back pressure, DOC, DPF and regeneration, SCR and DEF, EGR and crankcase ventilation (19%)
Diesel technicians preparing for the ASE L2 Electronic Diesel Engine Diagnosis Specialist test Medium and heavy truck technicians who hold a diesel engine and an electrical/electronic ASE certification Fleet and dealer technicians who diagnose electronic engine controls, fuel systems and aftertreatment Certified L2 technicians preparing for the L2R recertification test
Electronic Engine Controls Diagnosis
A J1939 data link backbone is checked with the key off and the batteries disconnected. What resistance should be measured between CAN High and CAN Low?
About 0 ohms
About 60 ohms
About 120 ohms
Infinite (open)
B
The J1939 backbone has a 120-ohm terminating resistor at each end. In parallel they measure about 60 ohms, which confirms both terminators and the backbone wiring are intact. About 120 ohms means one terminator is missing or the backbone is open, near 0 ohms means CAN High and CAN Low are shorted together, and an open reading means both terminators or the wiring are missing.
Updated 2026Instant accessLifetime access

ASE L2 Electronic Diesel Engine Diagnosis Practice Tests: 5 Practice Tests and 225 Questions

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About this course

These practice tests are for diesel, medium/heavy truck and fleet technicians preparing for the ASE L2 Electronic Diesel Engine Diagnosis Specialist test or the L2R recertification test. They are a quick way to check your readiness before you book the exam.

You get 5 full-length practice tests with 45 questions each, 225 questions in total, sized to the 45 scored questions of the real test, including a timed 120-minute Exam Mode test. Every question explains why the right answer is right and why the others are wrong, and each one is mapped to a content area of the 2026 ASE study guide. The series was rebuilt for 2026: every answer key was re-checked, ambiguous and outdated items were rewritten, and new questions cover electronic engine controls in depth, including J1939 data link testing, DMM and oscilloscope diagnosis, sensor circuits and interrelated systems.

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ASE L2 Electronic Diesel Engine Diagnosis

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