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Home >> Subaru >> 2020 >> Crosstrek Base, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 22 (Engine Control System (Diagnostics) (HEV) (4 Of 4)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P219C: Cylinder 1 Air-Fuel Ratio Imbalance >> General Description >> Outline Of Diagnosis >> Model equations for individual cylinder λ deviation (u (k))

Model equations for individual cylinder λ deviation (u (k))

WARNING: This page is about a different variant/trim than selected.

"u (k-1)": Estimated individual cylinder λ deviation is calculated by the following model.

G10263499Courtesy of SUBARU OF AMERICA, INC.

a1~4, b1~4: Model parameters calibrated by primary oxygen sensor output λ and 'measured' individual cylinder λ.

(These parameters are calibrated and fixed prior to production. However these models are calculating the predicted λ of each cylinder during real world driving.)