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ECM Ground Circuit

  1. Using an ohmmeter, check for continuity to ground on ECM terminal A12 (Black/White wire). 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. Using a DVOM, touch negative lead of voltmeter to a ground. Touch positive lead of voltmeter to each ground terminal. With engine running, voltmeter should indicate less than one volt. If voltmeter reading is greater than one volt, check for open, corrosion or loose connection on ground wire.
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