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Home >> Infiniti >> 1994 >> Q45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Computerized Engine Controls >> Engine Control Module (ECM) >> Power Circuits
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Power Circuits

  1. Ensure ignition switch is in OFF position. Using a voltmeter, check for battery voltage between chassis ground and ECM terminal No. 58. See Figure . If battery voltage is not present, check fusible link and wiring. 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 ECM terminals No. 45, 49, 59 and 109. If battery voltage is not present, check fusible link and fuse "G". Turn ignition switch to OFF position. Battery voltage should be present for approximately 2-3 seconds at terminals No. 49, 59 and 109. If battery voltage is not as specified, check ECCS relay.
  3. Connect voltmeter between chassis ground and ECM 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 and defective ignition switch.
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