Confirmation Test (Using Lexus Scan Tool)

Connect Lexus scan tool to Data Link Connector (DLC) No. 3. See Figure. Ensure all accessories are turned off. Start and warm engine to normal operating temperature. Increase engine speed to 2500-3000 RPM for 3 minutes. Using Lexus scan tool, ensure heated oxygen sensors (bank No. 1 and No. 2 sensor No. 1 and No. 2) feedback to ECM fluctuates around .5 volt and are different from each other.