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Measuring Voltage

Special Tools

EL-39200 Digital Multimeter (DMM)

For equivalent regional tools, refer to Special Tools .

Danger: Before working on any high- voltage system, be sure to wear the following Personal Protection Equipment:

   • Safety glasses with appropriate side shields when within 50 feet of the vehicle, either indoors or outdoors
   • Certified and up-to-date Class "0" Insulation gloves rated at 1,000 V with leather protectors
      -  Visually and functionally inspect the gloves before use.
      -  Wear the Insulation gloves at all times when working with the high- voltage battery assembly, whether the system is energised or not.
Failure to follow the procedure exactly as written may result in serious injury or death.

Caution: Refer to Test Probe Caution in the Preface section.

The following procedure measures the voltage at a selected point in a circuit.

  1. Disconnect the electrical harness connector for the circuit being tested, if necessary.
  2. Enable the circuit and/or system being tested. Use the following methods:
    3. • Vehicle power mode to Vehicle in Service Mode or Vehicle On.
    • Turn ON the circuit and/or system with a scan tool in Output Controls.
    • Turn ON the switch for the circuit and/or system being tested.
  3. Select the V (AC) or V (DC) position on the digital multimeter (DMM).
  4. Connect the positive lead of the DMM to the point of the circuit to be tested.
  5. Connect the negative lead of the DMM to a good ground.
  6. The DMM displays the voltage measured at that point.
   


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