Air Fuel Ratio Sensor

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

1. INSPECT AIR FUEL RATIO SENSOR (for Bank 1)

(a) Measure the resistance according to the value(s) in the table below.





Standard Resistance:





If the result is not as specified, replace the sensor.

2. INSPECT AIR FUEL RATIO SENSOR (for Bank 2)

(a) Measure the resistance according to the value(s) in the table below.





Standard Resistance:





If the result is not as specified, replace the sensor.

3. INSPECT AIR-FUEL RATIO COMPENSATION SYSTEM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Select the following menu items: Powertrain / Engine and ECT / Data List / AFS B1 S1, AFS B2 S1, O2S B1 S2, and O2S B2 S2.

(d) Warm up the air fuel ratio sensor by running the engine at 2, 500 rpm for approximately 2 minutes.

(e) Keep the engine speed at 2500 rpm and confirm that the displays of "AFS B1 S1" and "AFS B2 S1" are as shown in the illustration.





HINT
* The illustration may slightly differ from the display on the Techstream.
* The waveform of the air fuel ratio sensor is displayed only on the Techstream.

(f) Check the displays of "O2S B1 S2" and "O2S B2 S2" with the engine speed at 2,500 rpm.

Standard condition:

Displays show that each voltage fluctuates between 0 and 1 V.

NOTICE:
* Perform the check immediately after warming up the engine.
* If the voltage oscillation could not be verified, warm up the heated oxygen sensor again. If it is still not possible to verify, perform a DTC check SFI System.