Automatic Trans.
Inspection of Terminal Voltage1. Warm up the engine to normal operating temperature and run it at idle.
2. Disconnect the heated oxygen sensor connection.
3. Connect a voltmeter between the heated oxygen sensor and a ground.
4. Run the engine at 3,000 rpm until the voltmeter indicates approx. O.55V.
5. Increase and decrease the engine speed suddenly several times. Verify that when the speed is increased, the meter reads O.5-1.O Volts, and when the speed is decreased it reads O.0-O.5 Volts.
6. If not as specified, replace the heated oxygen sensor.
Inspection of Heated Oxygen Sensor Heater
1. Turn the ignition switch OFF.
2. Disconnect the heated oxygen sensor connector.
3. Connect an ohmmeter between heated oxygen sensor terminals as shown.
4. Measure the resistance of the heater.
Specification: Approx. 6 Ohms (at 20°C {68°F})
5. If not as specified, replace the heated oxygen sensor.