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Ground Circuits

  1. Using an ohmmeter, check for continuity to ground on ECU terminals 40 and 60 on all models except Probe 2.2L. On Probe 2.2L models check ECA terminals 3A, 3B and 3C (2A, 2B and 2C with non-turbo, manual transmission). Resistance should be zero ohms. If not, 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 voltmeter reading is greater than 1 volt, check for open, corrosion or loose connection on ground lead.
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