Oxygen Sensor: Testing and Inspection

1. Remove access panel on right side of center console under dash, to access ECU.
2. Start engine and run at 2,000 rpm for 3 minutes then idle.
3. Using a digital volt/ohm meter, monitor the voltage at ECU terminal 2C (right side oxygen sensor).
4. Voltage should be varying between 0.3 - 0.6 volts. If not, check for open or short to ground in wiring between sensor and ECU.
5. Disconnect oxygen sensor harness connector.

Testing Oxygen Sensor:

6. Connect voltmeter between terminals "A" and "B" of sensor connector as shown in illustration, and monitor voltage while reving engine several times.
7. Voltage should be greater than 0.5 volt when accelerating and less than 0.4 volt when decelerating.
8. Replace oxygen sensor if voltage output is not as specified.

Testing Oxygen Sensor Heater:

9. Shut engine off, allow sensor to cool and connect DVM between oxygen sensor connector terminals "C" and "D" and measure resistance of heating element.

RESISTANCE: Approx. 13 ohms @ 68°F (20°C)

10. Replace sensor if resistance is not as specified.
11. Repeat test for left side oxygen sensor (ECU terminal 2D).