ASE L4 Domain 4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis Welcome to your ASE L4 Domain 4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis 1. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis When diagnosing a vehicle with an ultrasonic-based parking assist system that is not functioning, what should be checked after confirming there is no fault code present? A. The audio alert volume settings in the vehicle's infotainment system. B. The cleanliness of the ultrasonic sensor faces. C. The tire pressure of all four wheels. D. The brightness of the rear taillights. None 2. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis An ultrasonic sensor's range of detection can be affected by which of the following environmental factors? A. High altitude operation. B. Strong electromagnetic fields. C. Ambient noise at a frequency similar to the sensor's operation. D. Proximity to oceanic saltwater environments. None 3. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis During the service of an ultrasonic-based system, a technician notices that the sensor's seal is compromised. What is the most likely consequence if this issue is not addressed? A. Increased sensor range. B. Reduced sensitivity to small objects. C. Sensor damage due to moisture ingress. D. False positives due to air turbulence. None 4. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis A technician is unable to calibrate an ultrasonic sensor. What could be the cause? A. The sensor is installed at a slight angle. B. There is a low battery voltage condition. C. The vehicle is not on a level surface. D. There is a minor scratch on the sensor's surface. None 5. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis What is the recommended procedure after replacing an ultrasonic sensor on a vehicle? A. Immediate road testing at various speeds. B. Sensor calibration using the appropriate scan tool. C. Replacing all sensors in the system concurrently. D. Checking the alignment of the headlights. None 6. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis What issue can cause an ultrasonic parking assist system to fail intermittently in hot weather? A. The expansion of the sensor mounting brackets. B. Sensor overheating and temporary shutdown. C. Reduced electrical resistance in wiring. D. Increased ambient noise levels. None 7. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis If an ultrasonic sensor's performance degrades over time, which of the following is a common cause? A. The sensor's piezoelectric elements have become less responsive. B. The vehicle's battery is not supplying adequate voltage. C. Wear in the vehicle's suspension components. D. Diminished tire tread depth. None 8. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis What could cause an ultrasonic-based blind spot detection system to detect vehicles incorrectly? A. The presence of a strong Wi-Fi signal near the vehicle. B. The installation of aftermarket window tinting. C. A misaligned bumper where sensors are housed. D. The use of non-OEM tires. None 9. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis A customer complains that their ultrasonic-based collision avoidance system does not warn them of obstacles when driving at highway speeds. What is the MOST likely reason for this condition? A. The system is designed to operate at lower speeds. B. There is a software glitch that needs an update. C. The sensors are covered with road grime. D. The front bumper has been repainted. None 10. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis What would be a technician's first action when an ultrasonic sensor does not trigger the expected response during a function test? A. Replace the sensor immediately. B. Clean the sensor and retest. C. Check the vehicle's alignment. D. Inspect the related fuses and relays. None 11. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis After a front-end collision, a vehicle's ultrasonic-based system is not functioning correctly. The technician has confirmed that the sensors are not damaged. What should be checked NEXT? A. The wheel alignment readings. B. The sensor harness for pinches or breaks. C. The ECU for error codes. D. The ambient temperature sensor for accuracy. None 12. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis Which diagnostic procedure is essential after replacing an ultrasonic sensor for a self-parking system? A. Checking transmission fluid levels. B. Performing a wheel alignment. C. System initialization and learning process. D. Testing the vehicle's acceleration. None 13. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis In an ultrasonic-based system, what is the likely impact of a sensor installed with an incorrect orientation? A. No impact, as the system will self-calibrate. B. Decreased range due to signal attenuation. C. False detections or no detections due to altered ultrasonic beam path. D. Increased range and sensitivity. None 14. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis What type of diagnostic test should be performed to ensure that an ultrasonic sensor's signal is being received by the control module? A. A continuity test on the sensor's power supply wire. B. A signal return test using an oscilloscope. C. A load test on the vehicle's battery. D. A pressure test on the cooling system. None 15. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis When performing a health check on a sonar-based ADAS, a technician finds one sensor not responding. What is the most appropriate next step? A. Replacing all sensors as a set for uniform performance. B. Checking for obstructions or damage specific to the non-responsive sensor. C. Resetting the vehicle's ECU to reinitialize all ADAS components. D. Conducting a battery voltage test under load. None 16. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis A vehicle's ultrasonic-based system intermittently does not detect objects on the passenger side. What should be inspected first? A. The alignment of the vehicle's wheels. B. The integrity and routing of the wiring harness on the passenger side. C. The calibration of the throttle position sensor. D. The pressure in the passenger side tires. None 17. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis A technician receives an error code indicating "low sensor signal" from an ultrasonic parking aid. What is the LEAST likely cause? A. A faulty sensor. B. A weak battery. C. A short circuit in the sensor wiring. D. Incorrect tire size affecting vehicle ride height. None 18. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis Which of the following diagnostic tools is MOST appropriate for checking the proper operation of ultrasonic sensors in a blind-spot monitoring system? A. A TPMS (Tire Pressure Monitoring System) tool. B. A digital multimeter set to measure DC voltage. C. A scan tool with ADAS functionality. D. A chassis alignment machine. None 19. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis When troubleshooting an ultrasonic-based blind spot detection system that is not functioning, what should be checked first after verifying the complaint? A. The battery state of charge and health. B. The fuse and relay operation for the ADAS system. C. The tire pressure in all four tires. D. The cleanliness and attachment of the ultrasonic sensors. None 20. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis Which scenario indicates a need for reprogramming or recalibrating ultrasonic sensors? A. After routine engine maintenance. B. Following a change in tire brand but with the same specifications. C. After replacing or repairing a bumper where sensors are housed. D. When the brake pads are replaced. None 21. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis What could cause an ultrasonic sensor to send constant false alerts? A. A malfunctioning alternator. B. A small dent or deformation near the sensor's mounting area. C. Overinflated tires. D. A weak car battery. None 22. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis An ultrasonic sensor for a parking assist system has been replaced. What is the next mandatory procedure? A. Road testing the vehicle for at least 10 miles. B. Performing a sensor calibration using manufacturer-specific equipment. C. Resetting the vehicle's trip computer. D. Recharging the vehicle's air conditioning system. None 23. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis A technician notes that the ultrasonic parking aid system activates intermittently in the absence of obstacles. What should be the first step in diagnosing this problem? A. Conducting an onboard diagnostic system check for trouble codes. B. Checking for loose ground connections in the electrical system. C. Inspecting the ultrasonic sensors for signs of paint overspray. D. Measuring the voltage drop across the parking aid system's fuse. None 24. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis What is a potential consequence of using non-original equipment manufacturer (OEM) ultrasonic sensors in a vehicle's ADAS system? A. The vehicle's top speed may increase. B. The fuel efficiency may improve significantly. C. Sensor performance may not match the system requirements, leading to system malfunction. D. The vehicle's audio system may experience improved sound quality. None 25. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis When a sonar-based rear cross-traffic alert system fails to detect approaching vehicles, what is the most appropriate next diagnostic step after a visual inspection? A. Replace the rear bumper cover. B. Test each sensor's output signal with an oscilloscope. C. Perform a wheel alignment. D. Check the rearview camera for functionality. None 26. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis How should a technician address a damaged ultrasonic sensor detected during a pre-diagnostic vehicle walk-around? A. Clear any stored ADAS codes and retest the system. B. Temporarily cover the sensor with tape for protection. C. Replace the sensor and perform necessary system calibrations. D. Lubricate the sensor to ensure proper operation. None 27. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis What is the effect of excessive undercoating material applied near ultrasonic sensors? A. It can lead to increased sensor sensitivity and range. B. It may improve the accuracy of the sensor during inclement weather. C. It can cause signal damping, leading to decreased sensor performance. D. It has no effect on sensor performance as long as the material is non-metallic. None 28. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis In ultrasonic-based systems, what could be a common reason for intermittent sensor operation during wet conditions? A. Water temporarily affecting the acoustic properties of the sensor. B. Hydroplaning causing erratic vehicle dynamics. C. Moisture in the electrical connectors causing a short circuit. D. Water improving the conductivity of the sensor's surface. None 29. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis What diagnostic procedure is most appropriate when an ultrasonic parking sensor is inaccurately detecting distances? A. A leak-down test on each of the vehicle's cylinders. B. A dynamic range test in various environmental conditions. C. Pressure testing the cooling system for leaks. D. Measuring the resistance of the sensor with a multimeter. None 30. ASE L4: Ultrasonic (Sonar)-Based Systems Service and Diagnosis Which of the following diagnostic tools is MOST appropriate for checking the proper operation of ultrasonic sensors in a blind-spot monitoring system? A. A TPMS (Tire Pressure Monitoring System) tool. B. A digital multimeter set to measure DC voltage. C. A scan tool with ADAS functionality. D. A chassis alignment machine. None 1 out of 30 Time is Up! Time's up
