toyota Workshop Repair Guides

Toyota Workshop Service and Repair Manuals

Air/Fuel Ratio Sensor|Page 1743 > < Heated Oxygen Sensor|Page 1740
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Oxygen Sensor: Testing and Inspection
Air/Fuel Ratio Sensor

Air-Fuel Ratio (A/F) Sensor

COMPONENTS

INSPECTION

1. INSPECT HEATER RESISTANCE OF A/F SENSOR

a. Disconnect the sensor connector.
b. Using an ohmmeter, measure the resistance between terminals +B and HT.

Resistance:

at 20°C (68°F): 0.8 - 1.4 ohms
at 800°C (1,472°F): 1.8 - 3.2 ohms

If the resistance is not as specified, replace the sensor.
Torque: 20 Nm (200 kg.cm, 14 ft.lb)

Air/Fuel Ratio Sensor|Page 1743 > < Heated Oxygen Sensor|Page 1740