Air-Fuel Ratio Compensation System

INSPECT AIR-FUEL RATIO COMPENSATION SYSTEM

HINT: You can also check the system by choosing "DATA MONITOR", then "O2 SENSOR OUTPUT VOLTAGE" on the monitor of the hand-held tester.




a. Connect the LEXUS hand-held tester to the terminal OXL1 - E1 of the ECU.
b. Connect the LEXUS hand-held tester to the terminal OXR2 - E1 of the ECU.

CAUTION: Connect test leads from the back side of the connector with the ECU connected.

c. Warm up the oxygen sensor with the engine speed at 2,500 rpm for approx. 2 minutes.
d. Confirm that the voltage changes between 0 V to 1 V with the engine speed at 2,500 rpm.
OK:
The voltage changes more than 8 times in 10 seconds.

CAUTION:
- Perform the check immediately after the end of the warming up.
- If not confirming the change of voltage, warming up the oxygen sensor again.