Component Location
General Description

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.

DTC Description

In case the sensor output is 0.4~0.52 V during 600sec or the internal resistance is over 40 ㏀ under enable conditions, ECM sets DTC P0136. ( This DTC might be caused by the malfunction of Heater circuit, so, check the heater circuit first. )

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

● Signal check, wiring interruption

● Poor connection

● Open or short in signal circuit

● B1S2

General Enable Conditions

● After enough heated

● Battery voltage > 10.7V

● Catalyst temperature (model) : 350 ~ 800 ℃

Case1

Threshold Value

● Sensor voltage : 0.4~0.52 V

Diagnostic Time

● 600 sec

Case2

Enable Conditions

● Catalyst temperature (model) > 600 ℃

Threshold Value

● Internal resistance > 40 ㏀

MIL ON Condition

● 2 driving cycle

※ B1S2 : upstream oxygen sensor / B1S2 : downstream oxygen sensor

Specification

Specification

0.1 ~ 0.9V

Schematic Diagram
note
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Signal Waveform
Яндекс.Метрика