Downstream Oxygen Sensor
The downstream heated oxygen sensor signal is used to detect catalytic convertor deterioration. As the convertor
deteriorates, the signal from the downstream sensor begins to match the upstream sensor signal except for a slight
time delay. By comparing the downstream heated oxygen sensor signal to the signal from the upstream sensor, the
ECM calculates catalytic convertor efficiency. This calculation is also used to establish the upstream O
2
goal voltage
(switching point).
Removal & Installation - Upstream Oxygen Sensor
1. Disconnect the negative battery cable.
2. Disconnect the oxygen sensor electrical connector.
CAUTION:
Remove the oxygen sensor after the exhaust pipe has cooled.
3. Remove the upstream oxygen sensor (1).
(Tighten: Upstream oxygen sensor to 45 N·m)
4. Installation is in the reverse order of removal.
Removal & Installation - Downstream Oxygen Sensor
1. Disconnect the negative battery cable.
2. Disconnect the oxygen sensor electrical connector.
CAUTION:
Remove the oxygen sensor after the exhaust pipe has cooled.
3. Remove the downstream oxygen sensor (1).
(Tighten: Downstream oxygen sensor to 45 N·m)
4. Installation is in the reverse order of removal.
ON-VEHICLE SERVICE
PZSM030013
PZSM030023
03
03–171
Chery Automobile Co., Ltd.
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