Monitor Method

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This diagnostic monitor performs a functional check of the fuel system to determine an air-fuel ratio cylinder imbalance, as required by the regulations in Section (e) (6.2.1) (c). This method uses a parameter called "imbalance value" which is calculated for each cylinder. The "imbalance value" is the difference between the individual STFT of the specific cylinder and the average value of the individual STFT of the other three cylinders. These imbalance values are compared to each other in order to determine the "imbalanced cylinder", which is the cylinder with the maximum "imbalance value". A diagnostic value is calculated for the "imbalanced cylinder". When this diagnostic value is more than the predetermined threshold (lean malfunction) or less than the predetermined threshold (rich malfunction), a DTC for the most imbalanced cylinder is determined.

DTC for "Imbalanced cylinder" is following.

DTC P219C: Cylinder 1 Air-Fuel Ratio Imbalance

DTC P219D: Cylinder 2 Air-Fuel Ratio Imbalance

DTC P219E: Cylinder 3 Air-Fuel Ratio Imbalance

DTC P219F: Cylinder 4 Air-Fuel Ratio Imbalance