5 L4-2.3L (2007)
1. Disconnect the PCM connector.
2. Disconnect the front 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 D and PCM terminal 2G
Short circuit
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It there is no continuity, there is a short circuit. Repair or replace the wiring harness.
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HO2S terminal C and body ground
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HO2S terminal D and power supply
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HO2S terminal D and body ground
Rear Heated Oxygen Sensor (HO2S) Inspection
REAR HEATED OXYGEN SENSOR (HO2S) INSPECTION[L3]
NOTE: Before performing the following inspection, make sure to follow the procedure as indicated in the troubleshooting flowchart.
Rear HO2S voltage inspection
1. Warm up the engine to normal operating temperature.
2. Using the M-MDS, monitor the following:
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Vehicle speed (PID: VSS)
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Engine speed (PID: RPM)
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Rear HO2S voltage (PID: 02S12)
3. Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3,000 rpm or more.