toyota Workshop Repair Guides

Toyota Workshop Service and Repair Manuals

Air/Fuel Ratio Sensor|Page 1981 > < Heated Oxygen Sensor|Page 1978
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Oxygen Sensor: Testing and Inspection
Air/Fuel Ratio Sensor

COMPONENTS

INSPECTION

1. INSPECT HEATER RESISTANCE OF A/F SENSOR

a. Disconnect the A/F sensor connector.

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

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Resistance: 0.8 - 1.4 Ohms at 20 °C (68 °F)
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If the resistance is not as specified, replace the sensor.

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Torque: 44 Nm (450 kg.cm, 32 ft.lb)

c. Reconnect the A/F sensor connector.

2. INSPECT OPERATION OF A/F SENSOR

Air/Fuel Ratio Sensor|Page 1981 > < Heated Oxygen Sensor|Page 1978