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Home >> Infiniti >> 2004 >> M45 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> DTC P0420, P0430: Three Way Catalyst Function >> Diagnostic Procedure >> 6. Check Ignition Spark
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6. Check Ignition Spark

  1. Turn ignition switch OFF.
  2. Remove ignition coil assembly from rocker cover.
  3. Connect a known-good spark plug to the ignition coil assembly.
  4. Disconnect all injector harness connectors.
  5. Place end of spark plug against a suitable ground and crank engine.
  6. Check for spark.

OK or NG 

  1. OK: GO TO 7.
  2. NG: Check ignition coil with power transistor and their circuit.

    Refer to IGNITION SIGNAL .

    Fig 1: Identifying Ignition Coil With Power Transistor
    G00796012Courtesy of NISSAN MOTOR CO., U.S.A.