Overall Function Check

Use this procedure to check the overall function of the air fuel ratio (A/F) sensor 1 circuit. During this check, a DTC might not be confirmed.

With GST 

1. Start engine and warm it up to normal operating temperature.
2. Drive the vehicle at a speed of 80 km/h (50 MPH) for a few minuts in the suitable gear postion.
NOTE: Never apply brake during releasing the accelerator pedal.
3. Set D position, then release the accelerator pedal fully until the vehicle speed decreases to 50 km/h (30 MPH).
4. Repeat steps 2 to 3 five times.
5. Stop the vehicle and turn ignition switch OFF.
6. Wait at least 10 seconds and restart engine.
7. Repeat steps 2 to 3 five times.
8. Stop the vehicle and connect GST to the vehicle.
9. Make sure that no DTC is displayed.

   If the DTC is displayed, Go to DIAGNOSTIC PROCEDURE .