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Home >> Infiniti >> 1990 >> Q45 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Computerized Engine Controls >> Electronic Control Unit >> Power Circuits Test
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Power Circuits Test

  1. Using a voltmeter, check for battery voltage between ECU terminal No. 58 and ground. If battery voltage is not present, check Brown 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 ECU terminals No. 45, 49, 59 and 109. If battery voltage is not present, check Brown fusible link and fuse "G".
  3. Connect a voltmeter between ground and ECU terminal No. 43. 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 or defective ignition switch.
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