LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2004 >> Q45 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> DTC P0172, P0175: Fuel Injection System Function >> Diagnostic Procedure >> 9. Check Injector
April 5, 2026: LEMON Manuals is launched! Read the announcement.

9. Check Injector

  1. Turn ignition switch OFF.
  2. Confirm that the engine is cooled down and there are no fire hazards near the vehicle.
  3. Remove injector assembly. Refer to FUEL INJECTOR AND FUEL TUBE . Keep fuel hose and all injectors connected to injector gallery.
  4. Disconnect all injector harness connectors.
  5. Disconnect all ignition coil harness connectors.
  6. Prepare pans or saucers under each injectors.
  7. Crank engine for about 3 seconds.

    Make sure fuel does not drip from injector.

OK or NG 

OK (Does not drip.): GO TO 10.

NG (Drips.) : Replace the injectors from which fuel is dripping. Always replace O-ring with new one.