On-Vehicle Inspection

ON-VEHICLE INSPECTION

1. CHECK AIR FUEL RATIO COMPENSATION SYSTEM




a. Connect the intelligent tester to the DLC3.
b. Turn the ignition switch ON.
c. Select the following menu items: Data List / O2S B1 S1, O2S B2 S1, O2S B1 S2 and O2S B2 S2.
d. Warm up the heated oxygen sensor with the engine speed at 2,500 rpm for approximately 2 minutes.




e. Maintain the engine speed at 2,500 rpm and confirm that the display of "O2S B1 S1" and "O2S B2 S1" is as given in the illustration.

HINT:
- The illustration may slightly differ from the display on the intelligent tester.
- Only the intelligent tester displays the waveform of the heated oxygen sensor.

f. Confirm that the display of "O2S B1 S2" and "O2S B2 S2" changes between 0 to 1 V with the engine speed at 2,500 rpm.

OK: The voltage output oscillates more than 8 times in 10 seconds.

NOTE:
- Perform the check immediately after warming the engine up.
- If the voltage variation could not be verified, warm up the heated oxygen sensor again. If it could not be verified even after warming up the sensor again, check for DTCs.