Endeavor V6-3.8L SOHC (2004)
Oxygen Sensor: Testing and Inspection
HEATED OXYGEN SENSOR CHECK
Required Special Tools:
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MB991958: Scan Tool (MUT-III Sub Assembly)
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MB991824: V.C.I.
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MB991827: USB Cable
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MB991910: Main Harness A
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MB991316: Test Harness
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MD998464: Test Harness
<Right bank and left bank Heated oxygen sensor (rear)>
1. Using the scan tool MB991958, observe HO2S reading. If values are unsatisfactory, or if scan tool is not available, use the following procedure:
1. Disconnect the heated oxygen sensor connector and connect special tool MD998464 to the connector on the heated oxygen sensor side.
2. Make sure that there is continuity [11 - 18 Ohms at 20 °C (68 ° F)] between terminal No. 1 (red clip) and terminal No. 3 (blue clip) on the
heated oxygen sensor connector.
3. If there is no continuity, replace the heated oxygen sensor.
4. Warm up the engine until engine coolant is 80 ° C (176 °F) or higher.
5. Perform a revving for 5 minutes or more with the engine speed of 4,500 r/min.
6. Connect a digital voltage meter between terminal No. 2 (black clip) and terminal No. 4 (white clip).
2. While repeatedly revving the engine, measure the heated oxygen sensor output voltage.