2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 784
Diagnosis Procedure
1.CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connections M16, M70. See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Component
Tests and General Diagnostics/Power Supply and Ground Circuit.
Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace ground connections.
2.RETIGHTEN AIR FUEL RATIO (A/F) SENSOR 1
1. Loosen and retighten the A/F sensor 1. See: Engine, Cooling and Exhaust/Exhaust System/Exhaust Manifold/Service and Repair/Removal
and Installation.
- GO TO 3.
3.CHECK FOR INTAKE AIR LEAK
1. Start engine and run it at idle.
2. Listen for an intake air leak after the mass air flow sensor.
Is intake air leak detected?
YES - Repair or replace malfunctioning part.
NO - GO TO 4.
4.CLEAR THE MIXTURE RATIO SELF-LEARNING VALUE
1. Clear the mixture ratio self-learning value. See: Powertrain Management/Computers and Control Systems/Testing and
Inspection/Programming and Relearning/Mixture Ratio Self - Learning Value Clear/Special Repair Requirement.
