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Electrical and Electronic Systems A6 Flashcards

6 cards from real ASE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 6 Electrical and Electronic Systems A6 flashcards as text

  1. A circuit has a specified voltage drop of no more than 0.5 volts across a switch. The measured drop is 1.8 volts with the circuit loaded. This indicates:

    Answer: Excessive resistance in the switch contacts

    Excessive voltage drop across a switch indicates high resistance at the contact points — often caused by corrosion, pitting, or loose connections. Voltage drop testing is the best method for finding resistance in a loaded circuit.

  2. A technician is testing a blower motor circuit. The motor runs slowly at all speeds. Using a voltmeter, full battery voltage is present at the motor connector with the switch in HIGH position. The MOST likely cause is:

    Answer: High resistance in the ground circuit

    If full battery voltage is present at the motor but it still runs slowly, the problem is in the ground return path. Excessive resistance in the ground circuit restricts current flow, reducing motor speed. A faulty resistor would cause a no-operation condition at that speed, not slow operation at all speeds.

  3. When using an oscilloscope to test a crankshaft position sensor, the waveform shows a missing tooth pattern. This is:

    Answer: Normal — the missing tooth is a reference gap for TDC

    Most crankshaft position sensor reluctor wheels have a missing tooth or gap machined into them as a reference point that the ECM uses to identify TDC (top dead center) for cylinder #1. This is by design and not a defect.

  4. A vehicle has an inoperative power window on the right rear door only. All other windows work normally. The MOST efficient first test would be:

    Answer: Check for battery voltage and ground at the right rear window motor

    When only one window is inoperative, the problem is isolated to that circuit. Checking for voltage and ground at the motor quickly determines if the issue is in the switch/wiring (no voltage) or the motor itself (voltage present but no movement).

  5. A diode in an alternator rectifier bridge is shorted. This will MOST likely cause:

    Answer: AC ripple voltage to appear on the DC output

    A shorted diode in the rectifier bridge allows AC current to pass through rather than being blocked. This causes AC ripple to appear on the DC charging output, which can be detected with a voltmeter on AC setting or an oscilloscope. A reading above 0.5V AC indicates a bad diode.

  6. Technician A says a parasitic draw test should be performed with all doors closed and the vehicle in sleep mode. Technician B says a draw of 35 milliamps is acceptable on most modern vehicles. Who is correct?

    Answer: Both Technician A and Technician B

    Both technicians are correct. The vehicle must be in sleep mode (all modules powered down) for an accurate parasitic draw test, which requires doors closed and a waiting period. Most manufacturers specify a maximum draw of 25–50 milliamps, making 35 mA an acceptable general threshold.