Practice question

What is the primary diagnostic tool used to safely check for voltage, ground, and continuity in sensitive ECU circuits?

  1. A 12V test light with a standard incandescent bulb
  2. A High-Impedance Digital Multimeter (DMM)
  3. A heavy-duty carbon pile battery load tester
  4. An analog pointer-type battery hydrometer tester

Answer: B — A High-Impedance Digital Multimeter (DMM)

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