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Control Unit Ground Circuits

  1. On Probe 2.2L turbo and 2.2L non-turbo (ATX), use an ohmmeter to check for continuity to ground on ECA terminals 3A, 3B and 3C. On all other models, check for continuity to ground on ECA terminals 2A, 2B and 2C. See Figure . Resistance should be zero ohm. If resistance is not zero ohm, repair open to ground.
  2. Using a DVOM, touch negative lead of voltmeter to a good ground. Touch positive lead of voltmeter to each ground terminal. With vehicle running, voltmeter should indicate less than 1 volt. If voltage is greater than 1 volt, check for open, corrosion or loose connection on ground lead.
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