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Home >> Infiniti >> 2004 >> Q45 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> Ignition Signal >> Diagnostic Procedure >> 6. Check Ignition Coil Power Supply Circuit-III
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6. Check Ignition Coil Power Supply Circuit-III

  1. Turn ignition switch OFF.
  2. Disconnect ECM harness connector.
  3. Disconnect ECM relay.
  4. Check harness continuity between ECM terminal 12 and ECM relay terminal 3.

    Refer to Wiring Diagram.

    1. Continuity should exist. 
    Fig 1: Locating ECM & Fuel Pump Relay
    G00761350Courtesy of NISSAN MOTOR CO., U.S.A.
  5. Also check harness for short to ground and short to power.

OK or NG 

OK: GO TO 8.

NG: GO TO 7.