Tuesday, August 13, 2019

2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 434

2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 434



Overview/Basic Inspection.



13.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 14.



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



14.CHECK A/F SENSOR 1 HEATER



See: P Code Charts/P0031.



Is the inspection result normal?



YES - GO TO 15.



NO - Replace (malfunctioning) A/F sensor 1.



15.CHECK MASS AIR FLOW SENSOR



With CONSULT-III



Check mass air flow sensor signal in "DATA MONITOR" mode with CONSULT-III.



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



With GST



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 16.



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



16.CHECK SYMPTOM MATRIX CHART



Check items on the rough idle symptom in See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Symptom



Related Diagnostic Procedures.



Is the inspection result normal?



YES - GO TO 17.



NO - Repair or replace malfunctioning part.



17.ERASE THE 1ST TRIP DTC



Some tests may cause a 1st trip DTC to be set.



Erase the 1st trip DTC from the ECM memory after performing the tests. See: Powertrain Management/Computers and Control Systems/Testing



and Inspection/Scan Tool Testing and Procedures/On Board Diagnostic (OBD) System/Diagnosis Description.



- GO TO 18.



18.CHECK INTERMITTENT INCIDENT



See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Initial Inspection and Diagnostic Overview/Trouble



Diagnosis For Intermittent Incident/Description.