LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2004 >> M45 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> DTC P0420, P0430: Three Way Catalyst Function >> Diagnostic Procedure >> 7. Check Injector
April 5, 2026: LEMON Manuals is launched! Read the announcement.

7. Check Injector

  1. Turn ignition switch OFF.
  2. Remove injector assembly.

    Refer to FUEL INJECTOR AND FUEL TUBE .

    Keep fuel hose and all injectors connected to injector gallery.

  3. Disconnect all ignition coil harness connectors.
  4. Reconnect all injector harness connectors.
  5. Turn ignition switch ON.

    Make sure fuel does not drip from injector.

OK or NG 

  1. OK (Does not drip.):GO TO 8.
  2. NG (Drips.):Replace the injector(s) from which fuel is dripping.