This bulletin applies to 2017-2019 Infiniti Q50, Q60, QX60 and QX80 vehicles. Diagnosis for DTCs P0171 (fuel system lean Bank 1) and P0174 (fuel system lean Bank 2) have been revised.
1. Turn the ignition switch off and wait at least 10 seconds.
2. Turn the ignition on.
3. Turn the ignition off and wait at least 10 seconds. Confirm that battery voltage is 11 volts or more at idle before performing DTC confirmation.
4. Clear the mixture ratio self-learning value
a. Connect the CONSULT PC and plus VI to the vehicle.
b. Open CONSULT-III plus (C-III plus).
c. Start the engine and warm up to operating temperature.
d. Go to WORK SUPPORT and then select SELF-LEARNING CONT.
e. Clear mixture ratio self-learning value by selecting CLEAR.
5. Turn ignition off and wait at least 10 seconds.
6. Turn ignition on.
7. Turn ignition off and wait at least 10 seconds.
8. Start the engine and keep engine speed between 3,500 and 4,000 rpm for one minute under no load.
9. Let the engine idle for one minute.
10. Keep engine speed between 2,500 and 3.000 rpm for 20 minutes.
11. Check for first trip DTC. If DTC P2096, P2097, P2098 or P2099 is stored, replace the corresponding A/F sensor. If no DTCs are stored, continue with the diagnosis in the ESM for P0171/P0174 excluding A/F sensor.
