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Nissan Sentra B18 (2020-2025) Service Manual: B2721 Center Sensor [rl]

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

B2721–60

CENTER SENSOR [RL]

(Rear sonar sensor LH inner)

—

Diagnosis condition

When ignition switch is ON

Signal (terminal)

—

Threshold

Rear sonar sensor LH inner internal failure (reset error)

Diagnosis delay time

—

B2721–61

Diagnosis condition

When ignition switch is ON

Signal (terminal)

—

Threshold

Rear sonar sensor LH inner internal failure (configuration error)

Diagnosis delay time

—

B2721–62

Diagnosis condition

When ignition switch is ON

Signal (terminal)

—

Threshold

Rear sonar sensor LH inner internal failure (power supply error)

Diagnosis delay time

—

B2721–63

Diagnosis condition

When ignition switch is ON

Signal (terminal)

—

Threshold

Rear sonar sensor LH inner internal failure (self diag result)

Diagnosis delay time

—

B2721–65

Diagnosis condition

When ignition switch is ON

Signal (terminal)

—

Threshold

Rear sonar sensor LH inner internal failure (over temperature)

Diagnosis delay time

—

B2721–66

Diagnosis condition

When ignition switch is ON

Signal (terminal)

Rear inner left sensor signal

(terminal 21)

Threshold

Rear inner left sensor signal circuit is open or short to ground

Diagnosis delay time

—

B2721–67

Diagnosis condition

When ignition switch is ON

Signal (terminal)

—

Threshold

Rear sonar sensor LH inner internal failure (diag dump error)

Diagnosis delay time

—

B2721–68

Diagnosis condition

When ignition switch is ON

Signal (terminal)

—

Threshold

Rear sonar sensor LH inner internal failure (resonator error)

Diagnosis delay time

—

B2721–83

Diagnosis condition

When ignition switch is ON

Signal (terminal)

—

Threshold

Rear sonar sensor LH inner internal failure (CRC error)

Diagnosis delay time

—

B2721–92

Diagnosis condition

When ignition switch is ON

Signal (terminal)

—

Threshold

Rear sonar sensor LH inner internal failure (membrane error)

Diagnosis delay time

—

POSSIBLE CAUSE

  • Harness or connectors

  • Rear sonar sensor LH inner

FAIL-SAFE

  • Obstacle detection of rear sonar sensor LH inner is stopped

  • Audible warning (sonar buzzer) of all sensors is stopped

  • Sonar buzzer sounds for 3 seconds

Dtc Confirmation Procedure

DTC Confirmation Procedure

  1. DTC CONFIRMATION PROCEDURE

    1. CONSULT

      1. Ignition switch ON.

      2. Ignition switch OFF and wait at least 30 seconds.

      3. Ignition switch ON and wait at least 2 seconds or more.

      4. Select “Self Diagnostic Result” mode of “SONAR”.

    Is DTC B2721 detected?

    YES>>

    Refer to DTC Diagnosis Procedure.

    NO>>

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

    NO>>

    Confirmation after repair: Inspection End.

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

  1. DETERMINE MALFUNCTION TYPE

    1. CONSULT

      1. Ignition switch ON.

      2. Select “Self Diagnostic Result” mode of “SONAR”.

      3. Check DTC.

    Is DTC B2721–60, 61, 62, 63, 65, 66, 67, 68, 83 or 92 detected?

    YES >>

    66 – GO TO 2.

    YES >>

    60, 61, 62, 63, 65, 67, 68, 83 or 92 – GO TO 5.

    NO >>

    Refer to Intermittent Incident.

  2. CHECK REAR SONAR SENSOR LH INNER SIGNAL CIRCUIT FOR OPEN OR SHORT TO GROUND

      1. Ignition switch OFF.

      2. Disconnect sonar control unit and rear sonar sensor LH inner connectors.

      3. Check continuity between sonar control unit connector and rear sonar sensor LH inner connector.

        Sonar control unit

        Rear sonar sensor LH inner

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        B87

        21

        B403

        2

        Yes

      4. Check continuity between sonar control unit connector and ground.

        Sonar control unit

        —

        Continuity

        Connector

        Terminal

        B87

        21

        Ground

        No

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    Repair or replace harness or connectors.

  3. CHECK REAR SONAR SENSOR LH INNER GROUND CIRCUIT FOR OPEN

      1. Ignition switch OFF.

      2. Check continuity between sonar control unit connector and rear sonar sensor LH inner connector.

        Sonar control unit

        Rear sonar sensor LH inner

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        B87

        14

        B403

        1

        Yes

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Repair or replace harness or connectors.

  4. CHECK REAR SONAR SENSOR LH INNER SIGNAL

      1. Connect sonar control unit and rear sonar sensor LH inner connectors.

      2. Ignition switch ON.

      3. Check signal between the terminals of sonar control unit connector.

        Sonar control unit

        Condition

        Reference value

        Connector

        (+)

        (–)

        Terminal

        Terminal

        B87

        21

        14

        Sensor signal input

    Is the inspection result normal?

    YES >>

    Replace sonar control unit. Refer to Removal and Installation.

    NO >>

    Replace rear sonar sensor LH inner. Refer to Removal and Installation.

  5. PERFORM DTC CONFIRMATION PROCEDURE AGAIN

    1. CONSULT

      1. Ignition switch ON.

      2. Erase DTC.

      3. Select “Self Diagnostic Result” mode of “SONAR”.

      4. Check DTC.

    Is DTC B2721–60, 61, 62, 63, 65, 67, 68, 83, or 92 detected?

    YES >>

    Replace rear sonar sensor LH inner. Refer to Removal and Installation.

    NO >>

    Inspection End.

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