AIR FUEL RATIO SENSOR (for Sensor 1) ON-VEHICLE INSPECTION


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

    A01DW6EE02

    1. Using an ohmmeter, measure the resistance between the terminals.

      Standard resistance
      Tester Connection Specified Condition
      1 (HT) - 2 (+B) 1.8 to 3.4 Ω at 20°C (68°F)
      1 (HT) - 4 (AF-) 10 kΩ or higher

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

  2. INSPECT AIR FUEL RATIO COMPENSATION SYSTEM

    A01DX79E04

    1. Measure the voltage between terminals of the ECM.

      Standard voltage
      Tester Connection Condition Specified Condition
      E16-22 (A1A+) - E17-1 (E1) Ignition switch ON 3.3 V
      E16-22 (A1A+) - E17-1 (E1) Ignition switch ON 3.0 V
      E16-22 (A1A+) - E17-1 (E1) Ignition switch ON 3.3 V
      E16-22 (A1A+) - E17-1 (E1) Ignition switch ON 3.0 V

      Note

      Connect test leads from the back side of the ECM connector with the ECM connected.

      Tech Tips

      Voltage between terminals of the ECM is kept constant regardless of the voltage of the A/F sensor.

    2. Connect the intelligent tester to the DLC3.

    3. Select "DATA MONITOR" - "A/FS B1 S1", "A/FS B2 S1" and "O2S B1 S2" to display the monitor.

    4. Warm up the A/F sensor with the engine speed at 2,500 rpm for approximately 2 minutes.

    5. A01DVR8E03

      Keep the engine speed at 2,500 rpm and confirm that the displays of "A/FS B1S1" and "A/FS B2 S1" are similar to the illustration.

      Tech Tips


      • The illustration differs from the real display.

      • Only the intelligent tester displays the waveform of the A/F sensor.

    6. Confirm that the display of "O2S B1 S2" changes between 0 to 1 V with the engine speed at 2,500 rpm.