Oxygen Sensor: Testing and Inspection

INSPECTION OF OXYGEN SENSOR
CHECK OXYGEN SENSOR WITH VOLTMETER
(a) Warm up the engine to normal operating temperature.
(b) Connect the voltmeter to the check connector.
Service connector location: Near the No.2 relay block Connect the positive (+) testing probe to the Ox terminal and negative (-) testing probe to terminal E.
(c) Race the engine at 2,500 rpm for approx. 90 seconds.
(d) Maintain engine speed at 2,500 rpm.
(e) Check that the needle of the voltmeter fluctuates 8 times or more in 10 seconds within 0 - 1.0 volts.

NOTE:
- If this test is positive, the Oxygen sensor is OK. If not, inspect the other parts, hose connections and wiring of air suction and fuel system feedback control system. Air Injection
If no problem is found, replace the Oxygen sensor.