On-Vehicle Inspection

2GR-FE EMISSION CONTROL: AIR FUEL RATIO SENSOR (for 4WD): ON-VEHICLE INSPECTION

ON-VEHICLE INSPECTION
HINT: The type of ignition switch on this model differs according to the specifications of the vehicle. For the expressions used in this section, refer to the "EXPRESSIONS OF IGNITION SWITCH" precaution Service Precautions.

1. CHECK AIR FUEL RATIO COMPENSATION SYSTEM
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to the ON position.
(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 A/F sensor with the engine speed at 2500 rpm for approximately 2 minutes.






(e) Keep the engine speed at 2500 rpm and confirm that the AFS B1 S1 and AFS B2 S1 display is as shown in the illustration.
- The illustration may slightly differ from the display on the Techstream.
- Only the Techstream displays the waveform of the A/F sensor.
- Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the Injection Volume A/F Sensor.
- The A/F CONTROL operation lowers the fuel injection volume by 12.5% or increases the injection volume by 25%.
- The sensors react in accordance with increases and decreases in the fuel injection volume.





NOTE: The A/F sensor has an output delay of a few seconds.

(f) Confirm that the O2S B1 S2 and O2S B2 S2 display 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 DTC Check / Clear.