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Home >> Infiniti >> 1993 >> Q45 Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Ignition Checks >> DISTRIBUTORLESS Ignition System Checks (J30 & Q45) >> Ignition Coil Power Source
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Ignition Coil Power Source

  1. Turn ignition off. Disconnect ignition coil relay harness connector. Turn ignition on. Connect negative voltmeter lead to ground. On J30, connect positive lead to one harness Yellow/Black wire and then to the other Yellow/Black wire. On Q45, connect positive lead to harness Black/White wire and then to harness White/Black wire. On all models, battery voltage should be present on both terminals.
  2. On J30, if battery voltage is not present, check harness continuity between ECCS relay and EFI harness connector (Yellow/Black wire) and 7.5 amp fuse in fuse box. On Q45, if battery voltage is not present, check main harness connector, 30-amp fusible link in relay block, harness continuity between ignition coil relay and ignition switch, and harness continuity between ignition coil relay and battery. Repair or replace as necessary.
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