Oxygen Sensor: Testing and Inspection

NOTE: Oxygen sensor problems may set Diagnostic Trouble Codes 15 and/or 17.

TERMINAL VOLTAGE CHECK

Oxygen Sensor Terminal Voltage:

1. Warm engine to operating temperature.
2. Unplug sensor connector. Connect voltmeter between sensor terminal and ground.

NOTE: Use a high internal resistance type (more than 40K ohms) voltmeter.

3. Measure voltage while abruptly raising and lowering engine speed several times:
a. When speed is increased, meter should read 0.5 - 1.0V.
b. When speed is decreased, meter should read 0 - 0.4V.

5. If not as specified, replace sensor.