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Automotive Service Excellence (ASE) A6 Electrical/Electronic Systems practice questions

242 free questions with answers and explanations.

Practice test
  1. 151.A technician is diagnosing a vehicle with an intermittent no-start condition. The technician observes that the engine cranks normally but does not fire. Using a scan tool, the technician notes that the fuel pressure sensor reads 0 PSI during cranking. What is the MOST likely cause of this symptom?General Electrical/Electronic System Diagnosis
  2. 152.A vehicle's high-mount brake light (CHMSL) is inoperative, but the left and right brake lights are functioning correctly. The technician measures 0V at the power wire going into the CHMSL assembly when the brake pedal is pressed. What should the technician check NEXT?Lighting Systems Diagnosis and Repair
  3. 153.A technician is performing a battery load test on a 12-volt battery with a Cold Cranking Amps (CCA) rating of 600. The battery temperature is 70°F (21°C). What is the minimum acceptable voltage reading after 15 seconds of load?Battery Diagnosis and Service
  4. 154.A technician is replacing a starter motor. After installation, the engine cranks and starts normally, but the technician notices a strong burning smell from the starter motor after a few starts. What is the most likely cause?Starting System Diagnosis and Repair
  5. 155.A vehicle owner reports that their vehicle starts normally when the engine is cold, but experiences a 'slow crank' or 'no crank' condition when the engine is warm. All battery and charging system tests pass. What is the most likely cause?Starting System Diagnosis and Repair
  6. 156.A technician is using a digital battery analyzer (conductance tester) on a 12-volt battery. The tester displays 'GOOD BATTERY - LOW CHARGE' and indicates a measured CCA of 550A for a battery rated at 600 CCA. The open-circuit voltage is 12.0V. What is the MOST appropriate action based on these results?Battery Diagnosis and Service
  7. 157.A technician is inspecting a conventional lead-acid battery and measures the specific gravity of the electrolyte in one cell as 1.200, while the other five cells read 1.260. The battery's open-circuit voltage is 12.4V. What does this indicate?Battery Diagnosis and Service
  8. 158.A customer complains of a strong 'rotten egg' smell coming from their vehicle after driving for a while, accompanied by dimming headlights at idle. A technician suspects a battery issue related to the charging system. What is the MOST likely cause of these symptoms?Battery Diagnosis and Service
  9. 159.A technician is diagnosing a 'no-crank' condition on a vehicle equipped with a remote start system. The engine starts normally when using the remote start, but fails to crank when using the ignition key. What is the most likely cause?Starting System Diagnosis and Repair
  10. 160.A technician is diagnosing a vehicle that experiences a 'no-start' condition. When the key is turned to the START position, a single 'click' is heard from the engine compartment, but the starter motor does not engage. The battery has been tested and is fully charged. Which of the following is the most likely cause?Starting System Diagnosis and Repair
  11. 161.A technician is performing a voltage drop test across the insulated (positive) battery cable from the battery post to the starter motor's main power terminal. With the engine cranking, the voltmeter reads 0.8 volts. What does this reading indicate?Starting System Diagnosis and Repair
  12. 162.A technician is diagnosing a no-crank condition on a vehicle. With the ignition key in the START position, the starter motor does not engage, but a single, loud click is heard from the engine compartment. All dashboard lights illuminate brightly. Which of the following is the most likely cause?Starting System Diagnosis and Repair
  13. 163.A technician is performing a battery replacement on a modern vehicle equipped with extensive electronic modules. To prevent loss of memory settings (radio presets, learning algorithms, etc.) and potential fault codes, what tool or procedure should be utilized?Battery Diagnosis and Service
  14. 164.A vehicle with an Absorbent Glass Mat (AGM) battery requires charging. The technician has a conventional battery charger with selectable output modes. Which charging mode should the technician select to properly charge the AGM battery and prevent damage?Battery Diagnosis and Service
  15. 165.A technician is diagnosing a vehicle with an intermittent 'no-crank' condition. The battery tests good, and all main battery cables show acceptable voltage drops. When attempting to start, sometimes there is a single click, and sometimes there is no sound at all. Which component is most likely causing this intermittent issue?Starting System Diagnosis and Repair
  16. 166.A client complains that their vehicle occasionally fails to start, with no sound from the starter motor. When the technician checks, the battery is fully charged, and all connections are clean and tight. A test light connected to the S-terminal (solenoid trigger wire) on the starter solenoid illuminates brightly when the key is turned to START. What is the most likely cause?Starting System Diagnosis and Repair
  17. 167.A technician is diagnosing a no-crank, no-click condition on a vehicle. The battery is fully charged and tests good. When the key is turned to the 'START' position, the technician measures 12.6 volts at the starter motor's main power terminal and 0 volts at the starter solenoid's S-terminal. What is the most likely cause of this condition?Starting System Diagnosis and Repair
  18. 168.After replacing a starter motor, a technician notices that the engine cranks much slower than before, even though the battery is fully charged and tests good. All connections are tight. A voltage drop test on the negative (ground) battery cable during cranking shows 0.7 volts. What is the most likely cause of the slow cranking?Starting System Diagnosis and Repair
  19. 169.A technician is performing routine maintenance on a conventional flooded lead-acid battery. They notice a white, powdery substance accumulating around the positive battery terminal. What does this substance MOST likely indicate?Battery Diagnosis and Service
  20. 170.A technician is connecting a battery charger to a vehicle battery that is still installed in the vehicle. After connecting the positive clamp to the positive terminal of the battery, where should the negative clamp of the charger be connected?Battery Diagnosis and Service
  21. 171.A technician is performing battery maintenance on a conventional flooded lead-acid battery. They notice that the electrolyte level in one cell is significantly lower than the others. Which of the following is the most appropriate action?Battery Diagnosis and Service
  22. 172.A technician is preparing to perform a battery load test on a 12-volt battery. Before connecting the load tester, which of the following initial checks is MOST crucial to ensure a valid test result?Battery Diagnosis and Service
  23. 173.A vehicle exhibits slow cranking, especially in cold weather. The technician measures the open-circuit voltage of the 12-volt battery at 12.0 volts. Which of the following is the most appropriate next step?Battery Diagnosis and Service
  24. 174.A technician is performing a resistance test on a starter motor's field windings. The ohmmeter reads 0.1 ohms. Given that typical field winding resistance is very low, what does this reading most likely indicate?Starting System Diagnosis and Repair
  25. 175.A customer complains that their car's battery drains overnight. The technician performs a parasitic draw test. With the ignition off and all accessories off, the multimeter shows a current draw of 150 milliamperes (mA) after the body control module (BCM) has settled. What is the most likely conclusion?Battery Diagnosis and Service
  26. 176.A technician is performing a battery maintenance check. They notice a white, powdery substance accumulating around the battery terminals. What is this substance, and what does it indicate?Battery Diagnosis and Service
  27. 177.A technician is replacing a battery in a vehicle equipped with a Battery Management System (BMS). After installing the new battery, which of the following is most likely required to ensure proper system operation and battery life?Battery Diagnosis and Service
  28. 178.During a starting current draw test, a technician measures 350 amps with the engine cranking at 150 RPM. The manufacturer's specification for this engine is 180-250 amps at 200 RPM. The battery is fully charged and tests good. What does this measurement most likely indicate?Starting System Diagnosis and Repair
  29. 179.A technician is diagnosing a starting issue where the starter motor engages the flywheel but then makes a loud grinding noise and fails to crank the engine. A visual inspection reveals several chipped teeth on the flywheel ring gear. What is the most appropriate repair?Starting System Diagnosis and Repair
  30. 180.A technician is using a digital battery analyzer (conductance tester) on a 12-volt battery. The analyzer reports 'GOOD BATTERY' but with a significantly lower CCA rating than specified by the manufacturer. What is the most appropriate action?Battery Diagnosis and Service
  31. 181.A vehicle owner reports that their vehicle starts normally most of the time, but occasionally, when the ignition key is turned to the START position, nothing happens – no crank, no click, and all dashboard lights remain on brightly. The battery has been recently replaced. Which component is the most likely cause of this intermittent 'no-crank, no-click' condition?Starting System Diagnosis and Repair
  32. 182.A technician is checking the starter motor's pinion gear and flywheel ring gear for engagement. What is the typical clearance between the pinion gear and the flywheel ring gear when the pinion is fully engaged?Starting System Diagnosis and Repair
  33. 183.A technician is performing a battery load test on a 12-volt battery with a Cold Cranking Amperage (CCA) rating of 600 amps. The ambient temperature is 70°F (21°C). What is the MINIMUM acceptable voltage the battery should maintain for 15 seconds during the load test?Battery Diagnosis and Service
  34. 184.A technician is performing a bench test on a starter motor. The starter spins freely and quietly when applying battery voltage directly to the motor terminals, but the drive gear does not extend. What does this indicate?Starting System Diagnosis and Repair
  35. 185.A customer repeatedly experiences a 'no-crank' condition, especially when the weather is cold. The technician performs an open-circuit voltage test, which reads 12.6 volts. What is the MOST likely cause of the no-crank condition in this scenario?Battery Diagnosis and Service
  36. 186.A vehicle owner reports that their car's battery died after leaving the interior dome light on for several hours. The technician performs an open-circuit voltage test and measures 11.8 volts. What is the MOST appropriate next step for the technician?Battery Diagnosis and Service
  37. 187.A technician is performing a voltage drop test on the starter motor's main positive cable (battery to starter). With the engine cranking, the voltmeter reads 0.5 volts. The starter motor cranks slowly. What does this reading indicate?Starting System Diagnosis and Repair
  38. 188.A technician is testing a sealed, maintenance-free battery. Which of the following tests is typically NOT performed on this type of battery compared to a conventional flooded lead-acid battery?Battery Diagnosis and Service
  39. 189.A technician is performing a current draw test on a starter motor. With the engine cranking normally, the ammeter reads 120 amps. The vehicle is a 4-cylinder engine. What does this reading indicate?Starting System Diagnosis and Repair
  40. 190.A technician is performing a voltage drop test across the main battery cables during engine cranking. The negative battery cable (from battery post to engine block) shows a reading of 0.8 volts. What does this reading indicate?Starting System Diagnosis and Repair
  41. 191.A technician is diagnosing a parasitic draw on the battery that is causing a no-start condition after the vehicle sits overnight. The draw is measured at 250 mA. Which of the following is the most appropriate initial diagnostic step after verifying the draw?Starting System Diagnosis and Repair
  42. 192.A customer reports that their vehicle's battery is 'always dead' after sitting for a few days, even after being fully charged. The technician suspects a parasitic draw. Which of the following is the most appropriate initial step to diagnose this issue?Battery Diagnosis and Service
  43. 193.A technician is diagnosing a vehicle that experiences a 'click, no-crank' condition. The battery is fully charged and passes a load test. When the key is turned to 'START', a single loud click is heard from the starter solenoid, but the engine does not crank. What is the most probable cause?Starting System Diagnosis and Repair
  44. 194.A technician is performing an open-circuit voltage test on a 12-volt automotive battery. The multimeter reads 12.0 volts. Which of the following best describes the battery's state of charge?Battery Diagnosis and Service
  45. 195.A customer reports that their car's battery drains overnight, even when the vehicle is turned off. After confirming the battery is fully charged and healthy, the technician uses an ammeter to measure current draw with the ignition off. The ammeter reads 150 milliamperes (mA) after all systems have 'gone to sleep'. What does this reading indicate?Battery Diagnosis and Service
  46. 196.A technician is diagnosing a battery issue where the battery continuously overcharges, leading to a rotten egg smell and swollen battery case. The battery itself tested good initially. Which component is the most likely cause of this issue?Battery Diagnosis and Service
  47. 197.A technician is performing a specific gravity test on a conventional flooded lead-acid battery using a hydrometer. The readings for the six cells are: 1.265, 1.260, 1.270, 1.265, 1.200, 1.268. What does this set of readings indicate about the battery?Battery Diagnosis and Service
  48. 198.A vehicle is equipped with an Absorbent Glass Mat (AGM) battery. Which of the following statements about charging an AGM battery is TRUE?Battery Diagnosis and Service
  49. 199.A technician observes that a starter motor is drawing 300 amps during a current draw test, but the engine is cranking normally. The OEM specification for this starter is 150-200 amps. What does this indicate?Starting System Diagnosis and Repair
  50. 200.A technician is diagnosing a vehicle with a 'no-crank' condition. When the ignition is turned to START, the starter motor spins freely and rapidly, but the engine does not turn over. The battery is fully charged. What is the most likely cause?Starting System Diagnosis and Repair