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Home >> Infiniti >> 2003 >> Q45 >> Repair and Diagnosis >> External Pages >> Different car >> Section 201 (Engine Control System) >> DTC P0420, P0430: Three Way Catalyst Function >> Diagnostic Procedure >> 6. Check Ignition Spark

6. Check Ignition Spark

WARNING: This page is about a different car, the 2004 Infiniti Q45. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition switch OFF.
  2. Disconnect 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 

OK : GO TO 7.

NG : Check ignition coil with power transistor and their circuit.

Refer to IGNITION SIGNAL  .

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