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Ground Circuits

  1. Turn ignition off. Connect negative lead of ohmmeter to ground. Using positive lead, backprobe ECU terminals No. 5 and No. 17 (Black wires). Resistance should be zero ohms. If not, repair open wire to ground.
  2. Connect negative lead of DVOM to a good ground. Using positive lead, backprobe ECU terminals No. 5 and No. 17 (Black wires). With engine running, DVOM should indicate less than one volt. If higher than one volt, check for opens, corrosion, or loose connection on ground leads.
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