Main Heated Oxygen Sensor Testing

OXYGEN SENSOR INSPECTION
1. Warm up engine.
- Allow the engine to warm up to normal operating temperature.
2. Inspect feedback voltage.

Diagnostic Chart:

- Connect the positive (+) tester probe of a voltmeter to terminal VF1 of the DLC1, and negative (-) tester probe to terminal E1. Do the test as described in the figure above.

HINT: Use SST when connecting between terminals TE1 and E1 of the DLC1.

SST 09843-18020

3. Inspect heater resistance of main heated oxygen sensor.
- Disconnect the oxygen sensor connector.





- Using an ohmmeter, measure the resistance between the terminals +B and HT.

Resistance: At 20°C (68°F) 11 - 16 Ohms

- If the resistance is not as specified, replace the sensor.

Torque: 20 N.m (200 kgf.cm, 14 ft.lbf)

- Reconnect the oxygen sensor connector.