Ground Circuits

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Using a DVOM, check for continuity to ground on PCM terminals No. 40 and 60. See Figure . Resistance should be zero ohms. If resistance is not zero ohms, repair open to ground.
Using a voltmeter, 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 0.5 volt. If voltmeter reading is greater than 0.5 volt, check for open circuit, corrosion and loose connection on ground lead.