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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) >> Power Circuits
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Power Circuits

  1. Using a voltmeter, check for battery voltage between chassis ground and ECU terminals No. 46 and 109 on G20, or ECU terminal No. 58 on all other models. If battery voltage is not present, check fusible link. Fusible link also supplies power for fuel injectors.
  2. Turn ignition switch to ON position. Using a voltmeter, check for battery voltage between chassis ground and ECU terminals No. 36, 38 and 47 on G20 or terminals No. 45, 49, 59 and 109 on M30 and Q45. If battery voltage is not present, check fusible link and fuse "G".
  3. Connect voltmeter between chassis ground and ECU terminal No. 34 on G20 or terminal No. 43 on M30 and Q45. Turn ignition switch to START position. Battery voltage should be present only when ignition switch is in START position. If voltage is not present, check for blown fuse and defective ignition switch.
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