HEATED OXYGEN SENSOR CHECK

<Right bank and left bank heated oxygen sensor (front)> 1.Disconnect the heated oxygen sensor connector and connect the special tool (test harness) to the connector on the heated oxygen sensor side. 2.Make sure that there is continuity [4.5-8.0 Ω at 20°C (68°F)] between terminal 1 (red clip of special tool) and terminal 3 (blue clip of special tool) on the heated oxygen sensor connector. 3.If there is no continuity, replace the heated oxygen sensor. 4.Warm up the engine until engine coolant is 80°C (176°F) or higher. 5.Use the jumper wires to connect terminal 1 (red clip) of the heated oxygen sensor connector to the battery (+) terminal and terminal 3 (blue clip) to the battery (-) terminal. CAUTION: Be very careful when connecting the jumper wires; incorrect connection can damage the heated oxygen sensor. 6.Connect a digital voltage meter between terminal 2 (black clip) and terminal 4 (white clip). 7.While repeatedly racing the engine, measure the heated oxygen sensor output voltage. Standard value: Engine Heated oxygen sensor output voltage Remarks When racing engine 0.6 - 1.0V If you make the air/ fuel ratio rich by racing the engine repeatedly, a normal heated oxygen sensor will output a voltage of 0.6 - 1.0V. 8.If the sensor is defective, replace the heated oxygen sensor. NOTE: For removal and installation of the heated oxygen sensor, refer to GROUP 15 - Exhaust Pipe and Main Muffler.

<Right bank and left bank heated oxygen sensor (rear)> 1.Disconnect the heated oxygen sensor connector. 2.Make sure that there is continuity [7-40 Ω at 20°C (68°F)] between terminal 1 and terminal 3 on the heated oxygen sensor connector. 3.If there is no continuity, replace the heated oxygen sensor. NOTE: If the scan tool does not display the standard value although no abnormality is found by the abovementioned continuity test and harness check, replace the heated oxygen sensor (rear). NOTE: For removal and installation of the oxygen sensor, refer to GROUP 15 - Exhaust Pipe and Main Muffler.