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

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


G039663E02

  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


A111955E04

  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

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

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

  1. Connect the intelligent tester to the DLC3.

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

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



    A111996E03

  1. 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.

    HINT:
    1. The illustration differs from the real display.
    2. Only the intelligent tester displays the waveform of the A/F sensor.

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