Wednesday, August 28, 2019

2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 414

2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 414



50 cm (19.7 in). Be careful not to get an electrical shock while checking, because the electrical discharge voltage becomes 20 kV or more.



- It might damage the ignition coil if the gap of more than 17 mm (0.66 in) is made.



NOTE:



When the gap is less than 13 mm (0.52 in), a spark might be generated even if the coil is malfunctioning.



Is the inspection result normal?



YES - GO TO 9.



NO - GO TO 6.



6.CHECK FUNCTION OF IGNITION COIL-II



1. Turn ignition switch OFF.



2. Disconnect spark plug and connect a known-good spark plug.



3. Crank engine for approximately 3 seconds, and recheck whether spark is generated between the spark plug and the grounded metal portion.



Spark should be generated.



Is the inspection result normal?



YES - GO TO 7.



NO - Check ignition coil, power transistor and their circuits. See: Powertrain Management/Computers and Control Systems/Testing and



Inspection/Component Tests and General Diagnostics/Ignition Signal/Diagnosis Procedure.



7.CHECK SPARK PLUG



Check the initial spark plug for fouling, etc.



Is the inspection result normal?



YES - Replace spark plug(s) with standard type one(s). For spark plug type, See: Maintenance.



NO - Repair or clean spark plug. Then GO TO 8.



8.CHECK FUNCTION OF IGNITION COIL-III



1. Reconnect the initial spark plugs.



2. Crank engine for approximately 3 seconds, and recheck whether spark is generated between the spark plug and the grounded portion.



Spark should be generated.



Is the inspection result normal?



YES - INSPECTION END



NO - Replace spark plug(s) with standard type one(s). For spark plug type, See: Maintenance.



9.CHECK COMPRESSION PRESSURE



Check compression pressure. See: Engine, Cooling and Exhaust/Engine/Compression Check/Testing and Inspection.



Is the inspection result normal?



YES - GO TO 10.



NO - Check pistons, piston rings, valves, valve seats and cylinder head gaskets.



10.CHECK FUEL PRESSURE



1. Install all removed parts.



2. Check fuel pressure. See: Engine, Cooling and Exhaust/Engine/Tune-up and Engine Performance Checks/Fuel Pressure/Testing and



Inspection.



Is the inspection result normal?



YES - GO TO 12.



NO - GO TO 11.



11.DETECT MALFUNCTIONING PART



Check fuel hoses and fuel tubes for clogging.



Is the inspection result normal?



YES - Replace "fuel filter and fuel pump assembly".



NO - Repair or replace malfunctioning part.



12.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?