HO2S(B1/S2) is in the rear side of Catalytic Converter to check the proper operation of catalyst. Oxygen density after the catalytic converter has to be within specific range (around 0.5V when there is no acceclation and deceleration.)
If the oxygen density changes in accordance with HO2S(B1/S1), it means the poor performance of catalytic converter.
If the counter that the signal voltage changes rapidly is over 5 times, PCM sets DTC P2232.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Rationality check | ● Poor connection ● Short to power in signal circuit ● B1S2 ● ECM |
Enable Conditions | ● After enough heated ● Battery voltage > 10.7V ● Catalyst temperature (model) < 800℃ ● Time after dew point end detected > 10 sec | |
Threshold Value | ● Counter of [ △ushk > 2V after heater on→off ] > 5 times | |
Diagnostic Time | ||
MIL | ● ON |
※ △ushk : Sum of the signal voltage change value (B1S2)
※ B1S1 : upstream oxygen sensor / B1S2 : downstream oxygen sensor
Specification | 0.1 ~ 0.9V |
