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ECM Ground Circuit

  1. Measure resistance between ECM terminal A12 (Black/White wire) and ground. ECM is located behind passenger kick panel. Ground for ECM is located on right side of engine (firewall side). See Figure . Resistance should be zero ohms. If resistance is not zero ohms, repair open in ground circuit.
  2. Connect negative lead of DVOM to ground. Start engine. Backprobe terminals A12 and D1. DVOM should indicate less than one volt. If reading is greater than one volt, check for open, corrosion, or loose connection on ground wire.
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