1 | Fault code | right before TWC right after TWC right before TWC left before TWC left after TWC left before TWC |
2 | Fault memory and actuation of CHECK ENGINE (MIL) | After two consecutive journeys with fault |
3 | Frequency of testing | Continuous |
4 | Checked signal or status | A Limit values of oxygen sensor signal B Sensor status change |
5 | A Limit values of oxygen sensor signal Lower limit value Upper limit value Duration of test B Sensor status change |
< -0.15 V > 1.5 V < 5 s After approx. 220 seconds with the sensor heater switched on the sensor signal must not dwell in the 0.4 - 0.6 V voltage window for more than approx. 5 seconds. |
6 | Test conditions | – Engine speed approx. 1000-2000 rpm – Load approx. 15-50 % – Three way catalytic converter temperature > 300°C – Lambda control enabled |
7 | | All electrical connection faults of the oxygen sensors before TWC or after TWC (cable open-circuit and short-circuit to ground or battery voltage) are recognized by means of the tests. |