On-Vehicle Inspection

WARNING: This page is about a different car, the 2007 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

CHECK AIR FUEL RATIO COMPENSATION SYSTEM
1. Connect the intelligent tester to the DLC3.
  
  Fig 1: Connecting Intelligent Tester To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Turn the ignition switch ON.
3. Select the following menu items: Data List / A/FS B1 S1 and O2S B1 S2.
4. Warm up the A/F sensor with the engine speed at 2,500 RPM for approximately 2 minutes.
5. Keep the engine speed at 2,500 RPM and confirm that the display of "A/FS B1 S1" is as shown in Fig 1.
  HINT:
  - The illustration may slightly differ from the display on the intelligent tester.
  - Only the intelligent tester displays the waveform of the A/F sensor.
6. Confirm that the display of "O2S B1 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.
  
  Fig 2: Fuel Ratio Changes Between 0 To 1 V With Engine Speed At 2,500 RPM
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  NOTE:
  - Perform the check immediately after warming the engine up.
  - If the voltage variation could not be verified, warm up the A/F sensor again. If it could not be verified even after warming up the sensor again, check for DTCs (see DTC P2195 OXYGEN (A/F) SENSOR SIGNAL STUCK LEAN (BANK 1 SENSOR 1); DTC P2196 OXYGEN (A/F) SENSOR SIGNAL STUCK RICH (BANK 1 SENSOR 1) ).