ASE L3 Domain 3: Drive Systems Welcome to your ASE L3 Domain 3: Drive Systems 1. ASE L3: Drive Systems When diagnosing a hybrid vehicle's drive system that exhibits reduced acceleration, which of the following diagnostic steps should be performed first? A. Check the hybrid battery's state of charge and health. B. Inspect the electric motor's resolver for proper signal output. C. Perform a backpressure test on the exhaust system. D. Analyze the transmission fluid for metal debris. None 2. ASE L3: Drive Systems A technician working on a hybrid vehicle's drive system notices a grinding noise during vehicle acceleration. What is the MOST likely cause of this noise? A. The planetary gear set is worn. B. The HV battery is discharging rapidly. C. The inverter is overheating. D. The regenerative braking system is engaged. None 3. ASE L3: Drive Systems In a series-parallel hybrid drive system, what could cause the vehicle to operate on the internal combustion engine alone, without electric assistance? A. A faulty wheel speed sensor B. A depleted HV battery C. An open in the 12V auxiliary battery circuit D. A malfunctioning brake light switch None 4. ASE L3: Drive Systems What condition could lead to a permanent magnet synchronous motor (PMSM) in a hybrid drive system to produce less torque than expected? A. A decrease in the ambient temperature around the inverter. B. Weakening of the permanent magnets within the motor. C. An increase in the high voltage battery's temperature. D. An incorrect wheel alignment. None 5. ASE L3: Drive Systems A hybrid vehicle with an electronically controlled continuously variable transmission (eCVT) fails to move when the drive mode is selected. The most appropriate initial diagnostic step is to: A. Check for diagnostic trouble codes (DTCs) in the transmission control module. B. Inspect the physical connection between the transmission selector and the transmission. C. Perform a stall test to measure the transmission output. D. Test the high voltage battery's ability to deliver current to the electric motor. None 6. ASE L3: Drive Systems A technician observes that a hybrid vehicle is not entering EV mode at low speeds as designed. What could be the most likely cause? A. The electric motor's bearings are failing. B. There is an error in the vehicle speed sensor reading. C. The hybrid control module firmware is outdated. D. The exhaust system has a minor leak. None 7. ASE L3: Drive Systems During a road test, a hybrid vehicle's drive system operates normally under light load but lacks power under heavy acceleration. The most likely cause of this symptom is: A. A restricted intake air filter. B. A malfunctioning electric drive motor inverter. C. A blocked high voltage battery cooling duct. D. A faulty accelerator pedal position sensor. None 8. ASE L3: Drive Systems A technician is troubleshooting a hybrid drive system that exhibits an intermittent loss of power. Which of the following could be a potential cause? A. HV battery cells with differing states of charge. B. A faulty fuel injector in the internal combustion engine. C. A partially clogged catalytic converter. D. A damaged spark plug in cylinder one. None 9. ASE L3: Drive Systems What issue can cause a false activation of the traction control system in a hybrid vehicle, leading to unintended changes in drive system behavior? A. A variance in tire pressure between the front and rear tires B. A weak 12-volt auxiliary battery C. Faulty electric motor temperature sensors D. An incorrect fluid level in the power inverter coolant reservoir None 10. ASE L3: Drive Systems If a technician notices that the regenerative braking system of a hybrid vehicle is less effective than usual, which of the following could be the cause? A. Air trapped in the hydraulic brake lines B. A degrading 12V auxiliary battery C. An undercharged high voltage battery D. A malfunctioning wheel speed sensor None 1 out of 10 Time is Up! Time's up
