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Home >> Infiniti >> 2021 >> QX80 Premium Select, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (5 Of 5) >> Engine (ECM) >> DTC P219F: Air Fuel Ratio >> DTC Description >> DTC Detection Logic

DTC Detection Logic

NOTE:
  • If DTC P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2 or P21A3 is displayed with other DTC, first perform the trouble diagnosis for the other DTC. Refer to DTC Index .

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P219C

CYLINDER 1 AIR-FUEL RATIO

(Cylinder 1 Air-Fuel Ratio Imbalance)

The cylinder 1 combustion condition calculated by ECM based on a crankshaft position sensor signal is continuously imbalanced compared with other cylinders. (Abnormal air-fuel ratio)

  • Fuel injector
  • Exhaust gas leaks
  • Incorrect fuel pressure
  • Mass air flow sensor
  • Intake air leaks
  • Lack of fuel
  • Incorrect PCV hose connection
  • Improper spark plug
  • Insufficient compression
  • The fuel injector circuit is open or shorted
  • Ignition coil
  • The ignition signal circuit is open or shorted

P219D

CYLINDER 2 AIR-FUEL RATIO

(Cylinder 2 Air-Fuel Ratio Imbalance)

The cylinder 2 combustion condition calculated by ECM based on a crankshaft position sensor signal is continuously imbalanced compared with other cylinders. (Abnormal air-fuel ratio)

P219E

CYLINDER 3 AIR-FUEL RATIO

(Cylinder 3 Air-Fuel Ratio Imbalance)

The cylinder 3 combustion condition calculated by ECM based on a crankshaft position sensor signal is continuously imbalanced compared with other cylinders. (Abnormal air-fuel ratio)

P219F

CYLINDER 4 AIR-FUEL RATIO

(Cylinder 4 Air-Fuel Ratio Imbalance)

The cylinder 4 combustion condition calculated by ECM based on a crankshaft position sensor signal is continuously imbalanced compared with other cylinders. (Abnormal air-fuel ratio)

P21A0

CYLINDER 5 AIR-FUEL RATIO

(Cylinder 5 Air-Fuel Ratio Imbalance)

The cylinder 5 combustion condition calculated by ECM based on a crankshaft position sensor signal is continuously imbalanced compared with other cylinders. (Abnormal air-fuel ratio)

P21A1

CYLINDER 6 AIR-FUEL RATIO

(Cylinder 6 Air-Fuel Ratio Imbalance)

The cylinder 6 combustion condition calculated by ECM based on a crankshaft position sensor signal is continuously imbalanced compared with other cylinders. (Abnormal air-fuel ratio)

P21A2

CYLINDER 7 AIR-FUEL RATIO

(Cylinder 7 Air-Fuel Ratio Imbalance)

The cylinder 7 combustion condition calculated by ECM based on a crankshaft position sensor signal is continuously imbalanced compared with other cylinders. (Abnormal air-fuel ratio)

P21A3

CYLINDER 8 AIR-FUEL RATIO

(Cylinder 8 Air-Fuel Ratio Imbalance)

The cylinder 8 combustion condition calculated by ECM based on a crankshaft position sensor signal is continuously imbalanced compared with other cylinders. (Abnormal air-fuel ratio)