2019 Infiniti M35 V6-3.5L (VQ35HR) Diagnostic and Repair Information Page 544
1. Start engine and let it idle.
2. Listen for an intake air leak after the mass air flow sensor.
Is intake air leak detected?
YES - Discover air leak location and repair.
NO - GO TO 2.
2.REPLACE ECM
1. Stop engine.
2. Replace ECM.
3. Go to See: Powertrain Management/Computers and Control Systems/Testing and Inspection/Programming and Relearning/Additional Service
When Replacing Control Unit/Special Repair Requirement.
- INSPECTION END
P0507
P0507 ISC SYSTEM
Description
The ECM controls the engine idle speed to a specified level through the fine adjustment of the air, which is let into the intake manifold, by
operating the electric throttle control actuator. The operating of the throttle valve is varied to allow for optimum control of the engine idling speed.
The crankshaft position sensor detects the actual engine speed and sends a signal to the ECM.
The ECM controls the electric throttle control actuator so that the engine speed coincides with the target value memorized in the ECM. The target
engine speed is the lowest speed at which the engine can operate steadily.
The optimum value stored in the ECM is determined by taking into consideration various engine conditions, such as during warming up,
deceleration and engine load (air conditioner, power steering and cooling fan operation, etc.).
DTC Logic
DTC DETECTION LOGIC
NOTE:
If DTC P0507 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.
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.
If the target idle speed is out of the specified value, perform See: Engine, Cooling and Exhaust/Engine/Tune-up and Engine Performance
Checks/Idle Speed/Testing and Inspection/Programming and Relearning/Special Repair Requirement, before conducting DTC
Confirmation Procedure.
TESTING CONDITION:
- Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.
- Always perform the test at a temperature above -10锟紺(14锟紽).
- GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine and warm it up to normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Turn ignition switch ON.
4. Turn ignition switch OFF and wait at least 10 seconds.
5. Start engine and run it for at least 1 minute at idle speed.
6. Check 1st trip DTC.
Is 1st trip DTC detected?
YES - Go to See: P Code Charts/P0507.
NO - INSPECTION END
Diagnosis Procedure
1.CHECK PCV HOSE CONNECTION
Confirm that PCV hose is connected correctly.
Is the inspection result normal?
YES - GO TO 2.
NO - Repair or replace malfunctioning part.
2.CHECK INTAKE AIR LEAK
1. Start engine and let it idle.
