ASE L2 Domain 3: Air Induction Systems Diagnosis Welcome to your ASE L2 Domain 3: Air Induction Systems Diagnosis 1. ASE L2: Air Induction Systems Diagnosis When diagnosing an air induction system of a diesel engine, a technician notes that the intake air heater does not operate. All fuses and relays are functional. What is the most likely cause? A. Faulty intake air temperature sensor B. Defective air heater element C. Improper ECM programming D. Open circuit in the air heater feed wire None 2. ASE L2: Air Induction Systems Diagnosis A diesel engine's air filter service indicator has triggered, but upon inspection, the air filter appears clean and undamaged. What could cause this premature indication? A. A leak in the intake duct downstream of the filter B. A restriction in the exhaust system C. Faulty service indicator sensor D. High altitude operation None 3. ASE L2: Air Induction Systems Diagnosis While troubleshooting a diesel engine with erratic power delivery, a technician discovers that the engine's boost pressure varies significantly under constant load conditions. There are no visible leaks or damage to the turbocharger system. What should the technician inspect next? A. The fuel delivery system for fluctuations B. The boost pressure sensor for accuracy C. The charge air cooler for internal obstructions D. The EGR system for intermittent sticking None 4. ASE L2: Air Induction Systems Diagnosis A technician finds oil in the intake manifold of a diesel engine. There are no performance complaints or codes. What is the most likely source of the oil? A. Turbocharger seal leakage B. PCV system malfunction C. Intake valve stem seal leakage D. Excessive engine blow-by None 5. ASE L2: Air Induction Systems Diagnosis A diesel engine is not achieving the desired boost pressure. The turbocharger and its control systems are functioning correctly. What should the technician inspect next? A. Exhaust backpressure for possible restrictions B. The intercooler for leaks or obstructions C. The intake manifold for pressure leaks D. The air filter for excessive contamination None 6. ASE L2: Air Induction Systems Diagnosis During a road test, a technician observes a lack of power and audible noise from the front of a diesel engine. The turbocharger appears to be functioning properly. What is the most likely cause? A. Faulty exhaust manifold gasket B. Damaged air induction hose C. Cracked intake manifold D. Worn engine accessory bearings None 7. ASE L2: Air Induction Systems Diagnosis A diesel engine is experiencing intermittent surging under load. The technician suspects an issue with the air induction system. Which of the following should be checked FIRST? A. Variable geometry turbocharger (VGT) operation B. Air-to-air intercooler for clogging C. Charge air piping for cracks D. Throttle valve for proper operation None 8. ASE L2: Air Induction Systems Diagnosis A technician diagnoses an overboost condition in a diesel engine. The turbocharger wastegate actuator rod is found to be disconnected. What is the NEXT appropriate action? A. Replace the turbocharger assembly. B. Connect the wastegate actuator rod and test operation. C. Inspect the intake manifold for damage due to overboost. D. Check the ECM for error codes related to the wastegate control. None 9. ASE L2: Air Induction Systems Diagnosis A diesel engine exhibits a whistle noise at higher RPMs, but turbocharger inspection reveals no faults. Which of the following could be the cause of the noise? A. Defective EGR valve B. Partially obstructed fuel injector nozzle C. Air filter housing deformation D. High-pressure fuel pump wear None 10. ASE L2: Air Induction Systems Diagnosis A technician is investigating a diesel engine that exhibits black smoke under heavy acceleration. The engine has a fresh air filter and the turbocharger spins freely. What could be the likely cause? A. Improperly adjusted valve clearances B. Defective mass airflow sensor C. Restricted EGR cooler D. Over-fueling due to a faulty injector None 1 out of 10 Time is Up! Time's up
