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Ground Circuits

  1. Using an ohmmeter, check for continuity to ground on ECU terminals A24, A26, D19 and D21. See Figure . Resistance should be zero ohms. If resistance is not zero ohms, repair open circuit.
  2. Using a DVOM, touch negative voltmeter lead to a good ground. Touch positive voltmeter lead to each ground terminal. With vehicle running, voltmeter should indicate less than .1 volt. If voltmeter reading is greater than .1 volt, check for open, corrosion or loose connection on ground lead.
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