2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 357
2. Listen to each fuel injector operating sound.
Clicking sound should be heard.
Is the inspection result normal?
YES - GO TO 7.
NO - Perform trouble diagnosis for FUEL INJECTOR, See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Injector/Testing and
Inspection/Component Tests and General Diagnostics/Diagnosis Procedure.
7.CHECK FUEL INJECTOR
1. Remove fuel injector assembly. See: Powertrain Management/Fuel Delivery and Air Induction/Fuel Rail/Service and Repair/Removal and
Installation.
Keep fuel hose and all fuel injectors connected to fuel tube.
2. Confirm that the engine is cooled down and there are no fire hazards near the vehicle.
3. Disconnect all fuel injector harness connectors.
4. Disconnect all ignition coil harness connectors.
5. Prepare pans or saucers under each fuel injector.
6. Crank engine for approximately 3 seconds.
Check that fuel does not drip from fuel injector.
Is the inspection result normal?
YES - GO TO 8.
NO - Replace the fuel injectors from which fuel is dripping. Always replace O-ring with new one.
8.CHECK INTERMITTENT INCIDENT
See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Initial Inspection and Diagnostic Overview/Trouble
Diagnosis For Intermittent Incident/Description.
- INSPECTION END
P0174
P0171, P0174 FUEL INJECTION SYSTEM FUNCTION
DTC Logic
DTC DETECTION LOGIC
With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on
the mixture ratio feedback signal from air fuel ratio (A/F) sensor 1. The ECM calculates the necessary compensation to correct the offset between
the actual and the theoretical ratios.
In case the amount of the compensation value is extremely large (the actual mixture ratio is too lean), the
ECM judges the condition as the fuel injection system malfunction and illuminates the MIL (2 trip detection logic).
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
