Air Fuel Ratio Sensor: Inspection: Procedure

INSPECT AIR FUEL RATIO SENSOR

PID/DATA Monitor Inspection (A/F Sensor)

Connect the techstream to the DLC-2.
Start the engine and warm it up completely.
Access the following PIDs using the techstream.
Refer to ON-BOARD DIAGNOSTIC TEST
- VSS (Vehicle speed)
- RPM (Engine speed)
- O2S11 (A/F sensor output current)
Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3, 000 rpm or more.

Verify that the A/F sensor output current (PID: O2S11) is 0.25 mA or more while decelerating as shown in the figure.

If not as verified, replace the A/F sensor.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Refer to REMOVAL

Resistance Inspection (A/F Sensor Heater)

WARNING:

A hot engine and exhaust system can cause severe burns. Turn off the engine and wait until they are cool before removing the exhaust system.

Measure the resistance between A/F sensor terminals 1 and 3.

If not as specified, replace the A/F sensor.

Refer to REMOVAL

A/F sensor heater resistance

1 to 10 ohms