5 L4-2.3L (2007)
4. Verify that the rear HO2S outputs a voltage of 0.6 V or more, one time or more, then verify that the rear HO2S voltage (PID: 02S12) is 0.3 V or
less while decelerating as shown in the figure.
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If not within the specification, inspect the HO2S for an open or short circuit. (See Rear HO2S circuit open/short inspection (sensor).) Then if
there is no malfunction in the wiring harness, replace the rear HO2S.
Rear HO2S circuit open/short inspection (sensor)
1. Disconnect the PCM connector.
2. Disconnect the rear HO2S connector.
3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
Open circuit
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If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
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HO2S terminal A and PCM terminal 2AH
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HO2S terminal B and PCM terminal 2AA
Short circuit
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If there is continuity, there is a short circuit. Repair or replace the wiring harness.
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HO2S terminal A and body ground
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HO2S terminal A and power supply