Neutralization system

The effectiveness of the system of neutralization is below a threshold level (P0420)

PCM unit compares the number of inversions of the front and rear oxygen sensors heated for a predetermined time. The PCM controls the number of inversions of the rear sensor for a given number of inversions of the front of the sensor, when the following conditions. The PCM detects the inversion ratio:

- Engine speed - 1410-3000 ^min -1 (models with manual transmission);

- Engine speed - 1281-3000 ^min -1 (model with automatic transmission);

- Design load of 15-50% *.

If the ratio inversions - below the threshold, the PCM determines that the operation of the system of neutralization deteriorated.

* The maximum calculated value of the load varies depending on the engine speed