On-Vehicle Inspection

2GR-FE EMISSION CONTROL: AIR FUEL RATIO SENSOR: ON-VEHICLE INSPECTION

1. CHECK AIR FUEL RATIO COMPENSATION SYSTEM

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Select the following menu items: Powertrain / Engine and ECT / Data List / AFS Voltage B1S1 and O2S B1S2.

(d) Warm up the A/F sensor with the engine speed at 2500 rpm for approximately 2 minutes.

(e) Maintain the engine speed at 2500 rpm and confirm that the display of "AFS Voltage B1S1" is as shown in the illustration.





HINT
* The illustration may slightly differ from the display on the Techstream.
* Only the Techstream displays the waveform of the A/F sensor.

(f) Confirm that the display of "O2S B1S2" changes between 0 to 1 V with the engine speed at 2500 rpm.

OK:

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

NOTICE:
* 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 P2195.