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Home › Infiniti › 2020 › QX80 Limited › Repair and Diagnosis › Engine Performance › System › Engine Control System (DTCS) (3 Of 5) › Engine (ECM) › DTC P0331: Knock Sensor › DTC Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK DTC PRIORITY 

    If DTC P0331 is displayed with DTC P0332 or P0333, first perform the confirmation procedure (trouble diagnosis) for DTC P0332 or P0333.

    Is applicable DTC detected?

    YES

    Perform diagnosis of applicable. Refer to DTC Description (P0332). Refer to DTC Description (P0333).

    NO

    GO TO 2.

  2. CHECK INSTALLATION CONDITION OF KNOCK SENSOR 

    Visually check that the knock sensor is installed normally.

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair or replace error-detected parts.

  3. CHECK INTERMITTENT INCIDENT 

    Check intermittent incident. Refer to Inspection .

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Repair or replace error-detected parts.

  4. CHECK KNOCK SENSOR CIRCUIT 

    Check knock sensor circuit. Refer to DTC Diagnosis Procedure .

    Is the inspection result normal?

    YES

    GO TO 5.

    NO

    Repair or replace error-detected parts.

  5. PERFORM DTC CONFIRMATION PROCEDURE 
    1. Turn ignition switch ON.
    2. Erase DTC.
    3. Perform DTC confirmation procedure. Refer to Confirmation Procedure .

    Is the 1st trip DTC P0331 displayed again?

    YES

    Replace ECM. Refer to ECM : Removal & Installation .

    NO

    INSPECTION END

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