Sunday, August 4, 2019

2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 361

2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 361



Is intake air leak detected?



YES - Repair or replace malfunctioning part.



NO - GO TO 3.



3.CHECK AIR FUEL RATIO (A/F) SENSOR 1 INPUT SIGNAL CIRCUIT



1. Turn ignition switch OFF.



2. Disconnect corresponding A/F sensor 1 harness connector.



3. Disconnect ECM harness connector.



4. Check the continuity between A/F sensor 1 harness connector and ECM harness connector.



5. Check the continuity between A/F sensor 1 harness connector or ECM harness connector and ground.



6. Also check harness for short to power.



Is the inspection result normal?



YES - GO TO 4.



NO - Repair open circuit, short to ground or short to power in harness or connectors.



4.CHECK FUEL PRESSURE



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 6.



NO - GO TO 5.



5. 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.



6.CHECK MASS AIR FLOW SENSOR



With CONSULT-III



1. Install all removed parts.



2. Check "MASS AIR FLOW" in "DATA MONITOR" mode with CONSULT-III.



For specification, See: Powertrain Management/Computers and Control Systems/Air Temperature Sensor ( Ambient / Intake )/Specifications.



With GST



1. Install all removed parts.



2. Check mass air flow sensor signal in Service $01 with GST.



For specification, See: Powertrain Management/Computers and Control Systems/Air Temperature Sensor ( Ambient / Intake )/Specifications.



Is the measurement value within the specification?



YES - GO TO 7.



NO - Check connectors for rusted terminals or loose connections in the mass air flow sensor circuit or grounds. See: P Code Charts/P0102.



7.CHECK FUNCTION OF FUEL INJECTOR



With CONSULT-III



1. Start engine.



2. Perform "POWER BALANCE" in "ACTIVE TEST" mode with CONSULT-III.



3. Check that each circuit produces a momentary engine speed drop.