General Information

P2232 O2 Sensor Signal Circuit Shorted to Heater Circuit (Bank1 Sensor2)

General Information

Component Location





General Description

HO2S (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 0.5 V when there is no acceleration and deceleration.) If the oxygen density changes in accordance with HO2S (S1), it means the poor performance of catalytic converter.

DTC Description

If the counter that records rapid signal voltage changes is more than 5 times, P2232 is set

DTC Detecting Condition





** The average change of ushk : Sum of the signal voltage change value (S2)
** S1 : upstream oxygen sensor / S2 : downstream oxygen sensor

Specification





Diagnostic Circuit Diagram





Signal Waveform & Data




The HO2S requires a minimum temperature to provide a closed loop fuel control system. So the HO2S contains a heater element to reduce its warm-up time and ensure its performance during all driving conditions. The HO2S heater is controlled ON after engine start except for Cold condition and high speed acceleration. The ECM controls this heater element by duty cycle. The main relay supplies voltage to the heater and the ECM provides a ground circuit for activating the heater.