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Nissan Sentra B18 (2020-2025) Service Manual: P0326 Knock Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detected condition

P0326

00

KNOCK SENSOR 1 B1

(Knock/Combustion Vibration Sensor 1 Circuit Range/Performance Bank 1 or Single Sensor)

Diagnosis condition

During fuel cut after engine warm-up

Signal

Knock sensor

Threshold

When the ECM detects knocking during engine running more than the threshold value

Diagnosis delay time

5 seconds

POSSIBLE CAUSE

Harness or connectors

(The knock sensor circuit is open or shorted.)

  • Knock sensor

  • Knock sensor installation

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

  1. CHECK DTC PRIORITY

    If DTC P0326 is displayed with DTC P0327 or P0328, first perform the confirmation procedure (trouble diagnosis) for DTC P0327 or P0328.

    Is applicable DTC detected?

    YES >>

    Perform diagnosis of applicable. Refer to DTC Description or DTC Description.

    NO >>

    GO TO 2.

  2. PRECONDITIONING

    If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

    1. Turn ignition switch OFF and wait at least 10 seconds.

    2. Turn ignition switch ON.

    3. Turn ignition switch OFF and wait at least 10 seconds.

    TESTING CONDITION:

    Before performing the following procedure, confirm that battery voltage is 10 V or more at idle.

    >>

    GO TO 3.

  3. PERFORM DTC CONFIRMATION PROCEDURE

    1. Start engine and warm it up to normal operating temperature.

    2. Revving engine from idle up to 3,000 rpm quickly.

    3. Repeat the step 2 at 10 times.

    4. Check DTC.

    Is DTC detected?

    YES >>

    Refer to DTC Diagnosis Procedure.

    NO-1 >>

    To check malfunction symptom before repair: Refer to Intermittent Incident.

    NO-2 >>

    Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK DTC PRIORITY

    If DTC P0326 is displayed with DTC P0327 or P0328, first perform the confirmation procedure (trouble diagnosis) for DTC P0327 or P0328.

    Is applicable DTC detected?

    YES >>

    Perform diagnosis of applicable. Refer to DTC Description or DTC Description.

    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 Intermittent Incident.

    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 DTC Description.

    Is the 1st trip DTC P0326 displayed again?

    YES >>

    Replace ECM. Refer to Removal & Installation.

    NO >>

    INSPECTION END

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