With Voltmeter
InspectionSensor
1. Warm up the engine to normal operating temperature.
2. Disconnect the heated oxygen sensor connector.
3. Measure the voltage at heated oxygen sensor [Front] connector terminal A by using a voltmeter.
4. Ground heated oxygen sensor [Rear] connector terminal B to body.
Measure the voltage at heated oxygen sensor [Rear] connector terminal A by using a voltmeter.
Specifications
5. If not as specified, inspect the following.
^ On-board diagnostic system
^ System inspections:
Intake manifold vacuum
Fuel line pressure
6. If all the systems are OK, replace the heated oxygen sensor.