DTC Description

The PCM/ECM tests rear HO2S signal level during the time the lambda target point is being shifted to rich to determine rear HO2S signal stuck. The PCM/ECM sets DTC P2270 if rear HO2S signal is below the predetermined threshold while target lambda point is being shifted to the predetermined value. If the same error code is set in the next driving cycle, the PCM/ECM illuminates the MIL.

DTC Detecting Condition

Item

Detecting Condition

Possible cause

DTC Strategy

Plausability check during shift of lambda setpoint to rich or lean (After P2096 / P2097 detection)

1.

Poor connection or damaged harness

2.

Rear HO2S

Enable Conditions

No fuel cut-off

No full load phase

No catalyst overheating protection

11V < Battery voltage < 16V

Threshold value

Rear HO2S signal > 0.2V when lambda set point = 1.15

Downstrem O2 sensor signal too high

Diagnosis Time

7 sec after lambda set point shift to corresponding side

MIL On Condition

2 Driving Cycles

Яндекс.Метрика