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Home >> Infiniti >> 2022 >> QX80 Premium Select, RWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (Diagnostics) (1 Of 2) >> Component/Circuit Diagnosis >> Ho2S2 >> Component Function Check
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Component Function Check

  1. PERFORM COMPONENT FUNCTION CHECK-I 

    SYMBOL WITH GST

    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 DTC Diagnosis Procedure .