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Home >> Mazda >> 1995 >> Protege L4-1.5L DOHC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Oxygen Sensor >> Testing and Inspection >> With Voltmeter
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With Voltmeter

Inspection
Sensor
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.

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