ASE A9 Light Vehicle Diesel Engines guide exam help

ASE A9 Light Vehicle Diesel Engines is part of the Automobile & Light Truck Certification Tests for technicians who diagnose, service, and repair cars, SUVs, and light-duty trucks up to Class 3. ASE lists A9 as 50 scored questions, with 60 total questions in the certification appointment because certification tests include additional unscored research questions; the testing time is 1 hour 15 minutes. Certification also requires appropriate hands-on work experience, and credentials must be renewed every five years. A9 is not required for ASE Master Automobile Technician status, which is earned through A1 through A8. The official A9 blueprint covers General Diagnosis (9 scored questions, 18%), Cylinder Head and Valve Train Diagnosis and Repair (5, 10%), Engine Block Diagnosis and Repair (5, 10%), Lubrication and Cooling Systems Diagnosis and Repair (6, 12%), Air Induction and Exhaust Systems Diagnosis and Repair (12, 24%), and Fuel System Diagnosis and Repair (13, 26%). Preparation should emphasize scan tool checks, diesel DTCs, freeze-frame data, smoke and exhaust odor, fuel contamination, crankcase pressure, hard-start and no-start diagnosis, glow plug and inlet air heater systems, turbochargers including VGT, charge-air coolers, exhaust backpressure, aftertreatment systems, high-pressure common rail or HEUI fuel systems, injector calibration coding, rail pressure control, oil and cooling system checks, and diesel-specific engine measurements.