ASE A9 Light Vehicle Diesel Engines study plan
ASE A9 Light Vehicle Diesel Engines · Give each week a clear focus.
8 weeks · About 7 hours per week
Diesel Fuel Injection and Management Systems
Map the high-pressure common-rail fuel path from tank to injector and label each component's function
Explain the difference between pressure-control and flow-control metering, and identify which strategy a given system uses
Diagnose a no-start complaint by checking rail pressure, injector pulse, and fuel quality in a logical sequence
Describe injector classification codes and the relearn procedure required after replacement
Your checkpoint
A one-page diagnostic flowchart for a crank-no-start diesel, with expected values for rail pressure during cranking
Diesel Fuel Injection and Management Systems & Emissions Control and Aftertreatment Systems
Trace the regeneration strategy for a DPF and identify the enabling conditions required before a regen can run
Interpret fuel-trim and injection-quantity data to distinguish a fuel delivery fault from an air or compression fault
Explain how EGR affects combustion and what DTCs would set if EGR flow is excessive versus insufficient
Compare the roles of DOC, DPF, and SCR in aftertreatment and the failure mode of each
Your checkpoint
A written case study of one hypothetical P20xx aftertreatment fault, from symptom to root cause, with the data you would capture
Emissions Control and Aftertreatment Systems & Air Induction, Exhaust, and Turbocharger Systems
Describe DEF quality, level, and dosing checks and how each produces a derate
Diagnose a low-boost complaint by evaluating turbocharger speed, boost pressure, and exhaust backpressure
Explain VGT and wastegate control and the symptoms of a stuck actuator
Identify causes of excessive crankcase pressure and how they interact with intake and exhaust restrictions
Your checkpoint
A table of boost-related symptoms mapped to probable causes, with the sensor or test used to confirm each
Air Induction, Exhaust, and Turbocharger Systems & General Diesel Engine Diagnosis
Perform a systematic intake and exhaust restriction evaluation and state pass/fail criteria
Explain compression testing on a diesel and how to interpret results across cylinders
List the causes of excessive black smoke, white smoke, and blue smoke and the diagnostic path for each
Describe a cylinder balance or contribution test and how to act on the results
Your checkpoint
A completed compression and cylinder-balance worksheet with interpretation notes for a simulated engine
General Diesel Engine Diagnosis & Cylinder Head, Valve Train, and Block Assembly
Explain the diesel combustion event and the role of injection timing and duration
Describe valve train components and how to check valve lash or hydraulic lifter operation
Identify cylinder head and gasket failure symptoms and the tests that distinguish them
Explain block assembly checks including liner protrusion and main bearing clearance measurement
Your checkpoint
A diagnostic decision tree for a misfire or knocking complaint that separates fuel, air, compression, and mechanical causes
Cylinder Head, Valve Train, and Block Assembly & Lubrication and Cooling Systems
Describe the lubrication circuit and the function of the oil pump, cooler, and bypass valves
Explain oil analysis interpretation and when to recommend it
Trace the cooling circuit and diagnose overheating and coolant loss on a diesel
Explain the interaction between oil quality, soot loading, and DPF regeneration
Your checkpoint
A cooling-system pressure test and oil-pressure test procedure with expected values and a fault matrix
Starting, Charging, and Electrical/Electronic Systems
Explain battery testing, starting circuit voltage drop, and alternator charging verification
Describe how the ECM uses sensor inputs and how to test a suspect sensor circuit with a multimeter
Interpret CAN bus communication faults and the steps to isolate a module
Explain glow plug control and cold-start assist operation
Your checkpoint
A voltage-drop testing checklist for the starting and charging circuits with acceptable limits
General Diesel Engine Diagnosis & Diesel Fuel Injection and Management Systems & Emissions Control and Aftertreatment Systems
Synthesize a full diagnostic strategy for a derate or limp-home complaint across fuel, air, and aftertreatment
Complete a timed practice set of mixed-domain questions and review every miss
Revisit the weakest domain from prior weeks and close the gap with targeted review
Build a personal quick-reference sheet of key specifications and diagnostic steps
Your checkpoint
A scored 50-question mixed-domain practice exam with a written review of every incorrect answer
Milestones
Week 2: Can explain the full fuel path and aftertreatment strategy without notes, and score at least 70% on a self-made 20-question quiz on domains 5 and 7
Week 4: Can perform a compression and cylinder-balance interpretation and correctly identify the fault in three of four simulated scenarios
Week 6: Can trace lubrication and cooling circuits and state pass/fail criteria for oil pressure and cooling-system tests from memory
Week 8: Score at least 80% on the final 50-question mixed practice exam and have a written review of all missed items