Main Oxygen Sensor Testing

INSPECT HEATER RESISTANCE OF MAIN OXYGEN SENSOR
Inspect heater resistance of main oxygen sensor:
Using an ohmmeter, measure the resistance between the terminals +B and HT. If not as specified, replace the oxygen sensor.

Resistance: 5.1-6.3 ohms @ 20°C (68°F)







INSPECT FEEDBACK VOLTAGE
1. Warm up the engine.




2. Connect the voltmeter to the check connector terminals VF1 and E1.

NOTE: Use SST (09843-18020), when connecting between terminals TE1 and E1 of the check connector.