California

Heated Oxygen Sensor - Front:

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Heated Oxygen Sensor - Rear:

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Heated Oxygen Sensor Heater - Front:

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INSPECTION USING SCAN TOOL




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HARNESS INSPECTION

COMPONENT INSPECTION
1. Disconnect the heated oxygen sensor connector and connect the special tool, Test Harness, to the heated oxygen sensor connector.
2. Check that there is continuity [approx. 20 Ohms at 20°C (68°F) ] across terminals 1 and 3 of the heated oxygen sensor connector.
3. If there is no continuity, replace the heated oxygen sensor (rear).




4. Warm up the engine until the engine coolant temperature becomes 80°C (176°F) or higher.
5. Using jumper wires, connect terminals 1 (red clip of the special tool) and 3 (blue clip) of the heated oxygen sensor connector to battery positive and negative terminals respectively.

CAUTION: Ensure that the jumper wires are connected correctly, as wrong connections may result in a damaged heated oxygen sensor.




6. Connect a digital voltmeter across terminals 2 (black clip of the special tool) and 4 (white clip) .
7. Race the engine repeatedly and measure the output voltage of the heated oxygen sensor.




8. If the measurements are not as specified, defective heated oxygen sensor is suspected.