2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 479
Is the inspection result normal?
YES - INSPECTION END
NO - Go to See: P Code Charts/P0420.
Diagnosis Procedure
1.CHECK EXHAUST SYSTEM
Visually check exhaust tubes and muffler for dents.
Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace malfunctioning part.
2.CHECK EXHAUST GAS LEAK
1. Start engine and run it at idle.
2. Listen for an exhaust gas leak before the three way catalyst 1.
Is exhaust gas leak detected?
YES - Repair or replace malfunctioning part.
NO - GO TO 3.
3.CHECK INTAKE AIR LEAK
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.CHECK IDLE SPEED AND IGNITION TIMING
Check idle speed and ignition timing.
For procedure, See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Initial Inspection and Diagnostic
Overview/Basic Inspection.
For specification, See: Engine, Cooling and Exhaust/Engine/Tune-up and Engine Performance Checks/Idle Speed/Specifications and See: Engine,
Cooling and Exhaust/Engine/Tune-up and Engine Performance Checks/Ignition Timing/Specifications.
Is the inspection result normal?
YES - GO TO 5.
NO - Follow the See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Initial Inspection and Diagnostic
Overview/Basic Inspection.
5.CHECK FUEL INJECTORS
1. Stop engine and then turn ignition switch ON.
2. Check the voltage between ECM harness connector terminals as per the following.
