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Home >> Infiniti >> 1992 >> Q45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Computerized Engine Controls >> Electronic Control Unit (Ecu) >> Ground Circuits
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Ground Circuits

  1. Using an ohmmeter, check for continuity to ground on ECU terminals No. 6, 13, 39, 48, 107, 108 and 116 on G20 or terminals No. 10, 20, 50, 60, 107, 108 and 116 on M30 and Q45. Resistance should be zero ohms. If reading is not zero ohms, repair open to ground.
  2. Using a DVOM, touch negative lead of voltmeter to a good ground. Using positive lead of voltmeter, backprobe each ground terminal at ECU connector. With vehicle 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 lead.
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