Sunday, April 14, 2019

2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 430

2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 430



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.



- INSPECTION END



P0305



P0300, P0301, P0302, P0303, P0304, P0305, P0306 MISFIRE



DTC Logic



DTC DETECTION LOGIC



When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the crankshaft position (CKP) sensor signal to



vary, ECM can determine that a misfire is occurring.



The misfire detection logic consists of the following two conditions.



1. One Trip Detection Logic (Three Way Catalyst Damage)



On the 1st trip when a misfire condition occurs that can damage the three way catalyst (TWC) due to overheating, the MIL will blink.



When a misfire condition occurs, the ECM monitors the CKP sensor signal every 200 engine revolutions for a change.



When the misfire condition decreases to a level that will not damage the TWC, the MIL will turn off.



If another misfire condition occurs that can damage the TWC on a second trip, the MIL will blink.



When the misfire condition decreases to a level that will not damage the TWC, the MIL will remain on.



If another misfire condition occurs that can damage the TWC, the MIL will begin to blink again.



2. Two Trip Detection Logic (Exhaust quality deterioration)



For misfire conditions that will not damage the TWC (but will affect vehicle emissions), the MIL will only light when the misfire is detected on a



second trip. During this condition, the ECM monitors the CKP sensor signal every 1,000 engine revolutions.



A misfire malfunction can be detected in any one cylinder or in multiple cylinders.



DTC CONFIRMATION PROCEDURE



1.PRECONDITIONING



If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.



1. Turn ignition switch OFF and wait at least 10 seconds.



2. Turn ignition switch ON.



3. Turn ignition switch OFF and wait at least 10 seconds.



- GO TO 2.



2.PERFORM DTC CONFIRMATION PROCEDURE-I