Lancer L4-2.4L SOHC (2005)
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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MB991911: Main Harness B
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MB991658: Test Harness
<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 MB991658 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 and terminal No.3 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.4 and terminal No. 2.
2. While repeatedly revving the engine, measure the heated oxygen sensor output voltage.
