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Home >> Infiniti >> 2024 >> QX80 Premium Select, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (2 Of 2) >> Component /Circuit Diagnosis >> Ho2S2 >> Component Function Check
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Component Function Check

  1. PERFORM COMPONENT FUNCTION CHECK-I SYMBOL
    1. Start engine and warm it up to the normal operating temperature.
    2. Turn ignition switch OFF and wait at least 10 seconds.
    3. Turn ignition switch ON.
    4. Turn ignition switch OFF and wait at least 10 seconds.
    5. Restart engine and keep the engine speed between 3, 500 and 4, 000 rpm for at least 1 minute under no load.
    6. Let engine idle for 1 minute.
    7. Check the voltage between ECM harness connector terminals under the following conditions.
      ECM Condition Voltage
      + -
      Connector Terminal Connector Terminal
      F92 84 F91 43 Revving up to 4, 000 rpm under no load at least 10 times The voltage should be above 0.74 V at least once during this procedure.
      77

    Is the inspection result normal?

    YES>>

    INSPECTION END

    NO>>

    GO TO 2.

  2. PERFORM COMPONENT FUNCTION CHECK-II 

    Check the voltage between ECM harness connector terminals under the following conditions.

    ECM Condition Voltage
    + -
    Connector Terminal Connector Terminal
    F92 84 F91 43 Keeping engine at idle for 10 minutes The voltage should be above 0.74 V at least once during this procedure.
    77

    Is the inspection result normal?

    YES>>

    INSPECTION END

    NO>>

    GO TO 3.

  3. PERFORM COMPONENT FUNCTION CHECK-III 

    Check the voltage between ECM harness connector terminals under the following conditions.

    ECM Condition Voltage
    + -
    Connector Terminal Connector Terminal
    F92 84 F91 43 Coasting from 80 km/h (50 MPH) with selector lever in the D position The voltage should be above 0.74 V at least once during this procedure.
    77

    Is the inspection result normal?

    YES>>

    INSPECTION END

    NO>>

    Go to Refer to DTC Diagnosis Procedure .