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

242 free questions with answers and explanations.

Practice test
  1. 201.A technician is replacing a battery in a modern vehicle equipped with numerous electronic modules and volatile memory. What is the primary reason to use a memory saver or auxiliary power supply during battery replacement?Battery Diagnosis and Service
  2. 202.A technician is connecting a battery charger to a vehicle battery that is still installed in the vehicle. To prevent damage to sensitive electronic components, which connection sequence is generally recommended?Battery Diagnosis and Service
  3. 203.A vehicle owner reports that their car starts fine in 'Park' but not in 'Neutral'. The technician suspects an issue with the neutral safety switch. Where is this switch typically located in an automatic transmission vehicle?Starting System Diagnosis and Repair
  4. 204.A technician observes that when the ignition key is turned to the 'START' position, the starter motor spins freely and quickly, but the engine does not crank. What is the most likely cause?Starting System Diagnosis and Repair
  5. 205.A client complains that their vehicle frequently experiences a 'grinding' noise during startup, but the engine eventually cranks and starts. The noise is distinctly metallic and occurs only during the initial engagement. What is the most likely cause?Starting System Diagnosis and Repair
  6. 206.Which of the following battery types is typically found in vehicles requiring high cranking power and deep cycle capabilities for accessories, often seen in recreational vehicles or vehicles with extensive aftermarket electronics?Battery Diagnosis and Service
  7. 207.A technician is diagnosing a no-crank condition where the starter motor spins but the engine does not turn over. The battery is fully charged, and the starter solenoid clicks audibly. What is the most probable cause?Starting System Diagnosis and Repair
  8. 208.A vehicle exhibits slow cranking, especially when the engine is cold. A battery load test indicates the battery is good. A technician measures 0.6 volts across the positive battery cable (from battery post to starter B+ terminal) during cranking. What is the most appropriate next step in diagnosing this issue?Starting System Diagnosis and Repair
  9. 209.When charging a conventional lead-acid battery, which of the following safety precautions is most critical to prevent an explosion?Battery Diagnosis and Service
  10. 210.A technician is installing a new battery in a vehicle. After placing the battery in the tray and securing it, what is the correct sequence for connecting the battery cables?Battery Diagnosis and Service
  11. 211.A technician is installing a new starter motor. Which of the following is the most critical step to ensure proper operation and prevent damage to the new component?Starting System Diagnosis and Repair
  12. 212.During a starting circuit inspection, a technician notices significant corrosion around the battery terminals and cable ends. Which of the following is the most likely consequence of this condition?Starting System Diagnosis and Repair
  13. 213.A customer reports that the vehicle's turn signals flash rapidly on one side, but the bulbs appear to be functioning correctly both inside and outside the vehicle. What is the most likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  14. 214.A customer complains that the 'Check Engine' light on their vehicle illuminates, and a scan tool retrieves Diagnostic Trouble Code (DTC) P0420, 'Catalyst System Efficiency Below Threshold (Bank 1)'. Which of the following is the most likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  15. 215.A technician is diagnosing an inoperative fuel gauge. The fuel tank is known to be full. When the technician disconnects the fuel level sender unit's electrical connector, the fuel gauge immediately drops to 'Empty'. When the technician jumps the two terminals of the disconnected connector together with a wire, the fuel gauge immediately reads 'Full'. Which of the following is the MOST likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  16. 216.A customer complains that the 'Check Engine' light on their vehicle illuminates intermittently, but the engine performance seems normal. A technician connects a scan tool and finds no stored Diagnostic Trouble Codes (DTCs). Which of the following is the MOST likely cause of this intermittent warning light illumination?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  17. 217.A customer reports that the engine coolant temperature (ECT) gauge on their vehicle reads maximum ('H') whenever the engine is running, even when cold. A scan tool shows the ECT sensor reading -40°F (-40°C). What is the most likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  18. 218.A technician is diagnosing an intermittent loss of communication with the instrument cluster on a vehicle. A scan tool intermittently reports 'U0155 - Lost Communication with Instrument Panel Cluster (IPC) Control Module'. All other modules on the high-speed CAN bus are communicating normally. What is the most likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  19. 219.A customer complains that the 'Check Engine' light on their vehicle illuminates, and a scan tool retrieves Diagnostic Trouble Code (DTC) P0455. Which of the following is the most likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  20. 220.A customer complains that the 'Service Engine Soon' light is illuminated, and the fuel gauge reads empty even after filling the tank. A scan tool shows a fuel level sensor input of 0.0 volts. What is the most likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  21. 221.A technician is diagnosing an inoperative speedometer. The vehicle's scan tool shows a consistent vehicle speed sensor (VSS) reading of 30 MPH while driving at 60 MPH according to GPS. All other gauges are functioning normally. What is the most likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  22. 222.A customer reports that the low tire pressure warning light (TPMS) illuminates intermittently, specifically after driving for about 15-20 minutes on the highway. All tire pressures have been manually checked and are correct. A scan tool reveals no active or stored TPMS DTCs. Which of the following is the MOST likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  23. 223.A technician is diagnosing a complaint that the vehicle's tachometer reads erratically, jumping between correct readings and zero, while the engine runs smoothly and has no performance issues. The engine control module (ECM) reports a consistent and correct engine RPM signal via a scan tool. Which of the following is the MOST likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  24. 224.A technician is diagnosing an intermittent 'Brake' warning light on the dashboard. The fluid level is full, the parking brake switch is confirmed to be functioning correctly, and the brake pedal switch is operating normally. The light flickers randomly while driving. What is the most likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  25. 225.A technician is diagnosing an inoperative fuel gauge. The fuel tank is known to be half full. With the ignition on, the technician measures the resistance of the fuel level sender unit directly at its terminals and obtains a reading of 110 ohms. The vehicle manufacturer's specifications state that a half-full tank should correspond to a sender resistance of 50 ohms. Which of the following is the MOST likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  26. 226.A customer reports that the engine oil pressure warning light illuminates only when making a sharp left turn. The oil level is correct, and there are no engine noises. Which diagnostic step should the technician perform FIRST?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  27. 227.A technician is troubleshooting a vehicle where the ABS warning light is illuminated. A scan tool retrieves DTC C0034, indicating a 'Right Rear Wheel Speed Sensor Circuit Malfunction'. When checking the sensor circuit with an oscilloscope, the technician observes a square wave signal from the sensor, but it is inconsistent and drops out intermittently. What is the most likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  28. 228.A vehicle's warning chime for 'key in ignition' or 'lights on' when the door is open is inoperative. All other chimes (seatbelt, low fuel) function normally. A technician confirms the door ajar switch is operating correctly and the ignition switch properly detects the key. Which component is MOST likely faulty?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  29. 229.A vehicle's speedometer intermittently reads zero while driving, but the odometer continues to accumulate mileage correctly. There are no warning lights illuminated. Which of the following components is MOST likely at fault?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  30. 230.A vehicle's ambient air temperature display on the driver information center consistently reads -40°F (-40°C), regardless of the actual outside temperature. The HVAC system seems to be functioning correctly based on desired cabin temperature settings. Which of the following is the MOST likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  31. 231.A customer complains that the 'Service Engine Soon' light on their vehicle illuminates, and the engine feels sluggish, but there are no other warning lights. A scan tool retrieves DTC P0171 (System Too Lean Bank 1). The technician verifies the fuel pressure is within specifications and there are no obvious vacuum leaks. Which of the following components should the technician inspect NEXT to resolve the lean condition and the warning light?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  32. 232.A customer reports that the vehicle's battery voltage gauge consistently reads low (around 10V) while driving, but the vehicle starts and runs normally, and a multimeter test at the battery shows 14.2V with the engine running. What is the most likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  33. 233.A vehicle's coolant temperature gauge consistently reads maximum (H) even when the engine is cold or has just started. The engine cooling fan operates normally, and there are no overheating symptoms. A technician tests the coolant temperature sensor's resistance and finds it to be within specifications for the current ambient temperature. Which of the following is the MOST likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  34. 234.A customer reports that the low tire pressure warning light (TPMS) on their vehicle remains illuminated after having new tires installed. The technician verifies all tires are inflated to the correct pressure. A scan tool shows that one wheel speed sensor is not reporting tire pressure data, but is reporting wheel speed data correctly. What is the most likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  35. 235.A customer reports that the odometer on their vehicle has stopped recording mileage, but the speedometer is still functioning correctly. What is the most likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  36. 236.A customer complains that the 'Brake' warning light on the dash is constantly illuminated, even though the parking brake is released and the brake fluid level is full. A technician inspects the parking brake switch and confirms it is operating correctly. Which of the following is the MOST likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  37. 237.A vehicle with an integrated driver information display shows a blank screen intermittently. All other instrument cluster functions (gauges, warning lights) operate normally. A technician performs a 'wiggle test' on the wiring harness behind the instrument cluster while monitoring the display, but observes no change. Which of the following is the MOST appropriate NEXT diagnostic step?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  38. 238.A technician is diagnosing a complaint of an inoperative driver information display (DID) on a vehicle equipped with a Multi-Information Display (MID). The display is completely blank. All other dashboard functions, including the radio and climate control, are working. A scan tool reports no communication with the MID module. What is the most likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  39. 239.A technician is diagnosing a complaint of an inoperative fuel gauge. The fuel tank is known to be full. When checking the fuel level sender unit at the tank, the technician measures 20 ohms between the signal wire and ground. What should the technician conclude?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  40. 240.A customer reports that the low oil pressure warning light on their vehicle flickers at idle but turns off as engine RPM increases. The engine oil level is full and clean. What is the most likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  41. 241.A technician is diagnosing an inaccurate fuel gauge. With the ignition off, the technician measures the resistance of the fuel level sender unit at the instrument cluster connector, and then again directly at the sender unit in the fuel tank. Both readings are identical at 75 ohms. The fuel tank is known to be exactly half full, and manufacturer specifications indicate 50 ohms for a half-full tank. What is the MOST appropriate conclusion?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair
  42. 242.A technician is performing a diagnostic check on a vehicle with an inoperative fuel gauge. The fuel tank is known to be full. When measuring the resistance of the fuel level sending unit, the technician expects to see a reading of approximately 20 ohms. Instead, the multimeter shows an 'OL' (open loop) reading. What is the most likely cause?Gauges, Warning Devices, and Driver Information Systems Diagnosis and Repair