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Nissan Sentra B18 (2020-2025) Service Manual: B24a4-15 Intake Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

B24A4-15

INTAKE SENSOR

(Intake sensor)

Diagnosis condition

Ignition switch ON

Signal (Terminal)

Intake sensor signal

Threshold

The intake sensor recognition temperature is too low [less than -44°F (-42°C)]

Diagnosis delay time

2 seconds or more

POSSIBLE CAUSE

  • Intake sensor

  • A/C amp.

  • Harness or connectors (The sensor circuit is open or shorted to battery)

FAIL-SAFE

—

Confirmation Procedure

Confirmation Procedure

  1. PERFORM DTC CONFIRMATION PROCEDURE

    1. CONSULT

      1. Ignition switch ON.

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

      3. Check DTC.

    Is DTC 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. CHECK INTAKE SENSOR SIGNAL

      1. Ignition switch ON.

      2. Check voltage between A/C amp. harness connector.

        A/C amp.

        Voltage

        (Approx.)

        Connector

        Terminals

        +

        -

        M81

        23

        26

    Is the inspection result normal?

    YES >>

    Replace A/C amp. Refer to Removal and Installation.

    NO >>

    GO TO 2.

  2. CHECK INTAKE SENSOR POWER SUPPLY

      1. Ignition switch OFF.

      2. Disconnect intake sensor connector.

      3. Ignition switch ON.

      4. Check voltage between intake sensor harness connector and ground.

        +

        -

        Voltage

        (Approx.)

        Intake sensor

        Connector

        Terminal

        M169

        1

        Ground

        5 V

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    GO TO 5.

  3. CHECK INTAKE SENSOR GROUND CIRCUIT FOR OPEN

      1. Ignition switch OFF.

      2. Disconnect A/C amp. connector.

      3. Check continuity between intake sensor harness connector and A/C amp. harness connector.

        Intake sensor

        A/C amp.

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        M169

        2

        M81

        26

        Yes

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Repair harness or connector.

  4. CHECK INTAKE SENSOR

    1. Check intake sensor. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    Replace A/C amp. Refer to Removal and Installation.

    NO >>

    Replace intake sensor. Refer to Removal and Installation.

  5. CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR OPEN

      1. Ignition switch OFF.

      2. Disconnect A/C amp. connector.

      3. Check continuity between intake sensor harness connector and A/C amp. harness connector.

        Intake sensor

        A/C amp.

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        M169

        1

        M81

        23

        Yes

    Is the inspection result normal?

    YES >>

    GO TO 6.

    NO >>

    Repair harness or connector.

  6. CHECK INTAKE SENSOR POWER SUPPLY CIRCUIT FOR SHORT

    1. Check voltage between intake sensor harness connector and ground.

      +

      -

      Voltage

      (Approx.)

      Intake sensor

      Connector

      Terminal

      M169

      1

      Ground

      0 V

    Is the inspection result normal?

    YES >>

    Replace A/C amp. Refer to Removal and Installation.

    NO >>

    Repair harness or connector.

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