ASE T2 Domain 5: Air Induction and Exhaust Systems Diagnosis and Repair Welcome to your ASE T2 Domain 5: Air Induction and Exhaust Systems Diagnosis and Repair 1. ASE T2: Air Induction and Exhaust Systems Diagnosis and Repair During the inspection of a diesel engine's air induction system, a technician discovers oil in the charge air cooler CAC. What is the most likely cause of this condition? A. Turbocharger seal failure B. Crankcase ventilation system blockage C. Faulty air filter D. Intercooler end tank leakage None 2. ASE T2: Air Induction and Exhaust Systems Diagnosis and Repair A diesel engine exhibits low power and poor acceleration. The technician notes excessive black smoke from the exhaust. What could be the likely cause? A. Over-fueling of the engine B. Insufficient fuel supply to the engine C. Faulty exhaust gas recirculation (EGR) valve D. Restriction in the air induction system None 3. ASE T2: Air Induction and Exhaust Systems Diagnosis and Repair A technician is diagnosing an exhaust system problem on a diesel engine. The exhaust has a blue tint and the engine oil level is dropping rapidly. What is the primary cause of this issue? A. Oil contamination in the fuel B. Worn piston rings or cylinder liners C. Turbocharger compressor wheel damage D. High back pressure in the exhaust system None 4. ASE T2: Air Induction and Exhaust Systems Diagnosis and Repair If a diesel engine's exhaust system is modified with a larger diameter pipe, what effect can this have on the engine's performance? A. Increase in low-end torque B. Decrease in turbocharger spool time C. Increase in exhaust back pressure D. Potential decrease in engine back pressure and loss of low-end torque None 5. ASE T2: Air Induction and Exhaust Systems Diagnosis and Repair What is a potential consequence of a defective air induction system pressure sensor in a diesel engine? A. Over-estimation of air density leading to over-fueling B. Under-estimation of air density leading to under-fueling C. Increased air intake temperature D. Unchanged fuel delivery due to failsafe engine management strategies None 6. ASE T2: Air Induction and Exhaust Systems Diagnosis and Repair When diagnosing an engine that is not reaching its full rated power, the technician observes that the turbocharger boost is lower than specifications. All other systems are functioning properly. What is the most likely cause? A. A leaking exhaust manifold B. A clogged air filter C. A faulty turbocharger wastegate actuator D. Excessive turbocharger bearing clearance None 7. ASE T2: Air Induction and Exhaust Systems Diagnosis and Repair A technician encounters an issue with a diesel engine where the EGR system is suspected of not operating correctly. The most accurate way to test EGR system function is to: A. Visually inspect for carbon buildup in the EGR passages. B. Use a scan tool to command the EGR valve while monitoring engine RPM. C. Measure back pressure in the exhaust system. D. Disconnect the vacuum line to the EGR valve and test for suction. None 8. ASE T2: Air Induction and Exhaust Systems Diagnosis and Repair What is the likely impact on a diesel engine's performance if there is a significant leak in the intercooler or its connecting hoses? A. Increase in engine power due to cooler intake air B. Reduced engine power due to loss of turbocharger boost C. Improved fuel economy D. Increased exhaust gas temperature (EGT) None 9. ASE T2: Air Induction and Exhaust Systems Diagnosis and Repair When diagnosing an intermittent loss of power in a diesel engine, a technician should FIRST: A. Check for restrictions in the fuel filter. B. Inspect the turbocharger for shaft play and damage. C. Perform a back pressure test on the exhaust system. D. Verify the operation of the intake throttle control system. None 10. ASE T2: Air Induction and Exhaust Systems Diagnosis and Repair A diesel engine has a new, pronounced whistle from the exhaust system that is not consistent with normal turbocharger sounds. The most likely cause is: A. A disconnected exhaust gas temperature sensor B. A crack in the exhaust manifold or pipe C. A malfunctioning EGR valve D. An overfilled crankcase None 1 out of 10 Time is Up! Time's up
