S Nissan Sentra Manuals Library
Factory-style information for owners and repair work

Nissan Sentra techinfo

Find Nissan Sentra owner information, maintenance instructions, technical references, service procedures and useful repair pages in one clean online library.

Quick access Sentra Docs
B18 Owner's 2020-2025 Sentra owner information B18 Service 2020-2025 Sentra Workshop manual B17 Owner's 2013-2019 Sentra owner documentation B17 Service 2013-2019 Sentra service information

Nissan Sentra B18 (2020-2025) Service Manual: P1572 Ascd Brake Switch

Dtc Description

DTC Description

DTC DETECTION LOGIC

Note:

This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed. 1st trip DTC is erased when ignition switch OFF. And even when malfunction A is detected in two consecutive trips, DTC is not stored in ECM memory.

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P1572

ASCD BRAKE SW

(ASCD brake switch)

Diagnosis condition

Nissan Sentra Vehicle speed: More than 30 km/h (19 MPH)

Signal (terminal)

Brake pedal position switch signal

Threshold

Brake pedal position switch signal is not sent to ECM for extremely long time

Diagnosis delay time

—

POSSIBLE CAUSE

  • Harness or connectors

    • Brake pedal position switch circuit is shorted.

  • Brake pedal position switch

  • Incorrect brake pedal position switch installation

  • ECM

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

  1. CHECK DTC PRIORITY

    If DTC P1572 is displayed with DTC P0605, perform the trouble diagnosis for DTC P0605.

    Is applicable DTC detected?

    YES >>

    Perform diagnosis of applicable. Refer to 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.

    Note:

    Procedure for malfunction B is not described here. It takes extremely long time to complete procedure for malfunction B. By performing procedure for malfunction A, the incident that causes malfunction B can be detected.

    Will CONSULT be used?

    YES >>

    GO TO 3.

    NO >>

    GO TO 5.

  3. PERFORM DTC CONFIRMATION PROCEDURE-1

    With CONSULT

    1. Start the engine.

    2. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.

    3. Press ASCD switch and make sure that CRUISE indicator is displayed in combination meter.

    4. Drive the Nissan Sentra vehicle for at least 5 consecutive seconds as per the following conditions.

      CAUTION:

      Always drive Nissan Sentra vehicle at a safe speed.

      Note:

      This procedure may be conducted with the drive wheels lifted in the shop or by driving the Nissan Sentra vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.

      Nissan Sentra Vehicle speed

      More than 30 km/h (19 mph)

      Selector lever

      • Except P or N position (CVT models)

      • Except neutral position (M/T models)

    5. Check DTC.

    Is DTC detected?

    YES >>

    Refer to DTC Diagnosis Procedure.

    NO >>

    GO TO 4.

  4. PERFORM DTC CONFIRMATION PROCEDURE-2

    With CONSULT

    1. Drive the Nissan Sentra vehicle and maintain the following condition for at least 5 seconds.

      CAUTION:

      Always drive Nissan Sentra vehicle at a safe speed.

      Note:

      This procedure may be conducted with the drive wheels lifted in the shop or by driving the Nissan Sentra vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.

      Nissan Sentra Vehicle speed

      More than 30 km/h (19 mph)

      Selector lever

      • Except P or N position (CVT models)

      • Except neutral position (M/T models)

      Driving condition

      Depress the brake pedal for more than five seconds so as not to come off from the above-mentioned Nissan Sentra vehicle speed.

    2. 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

  5. PERFORM COMPONENT FUNCTION CHECK

    Without CONSULT

    Note:

    Use component function check to check the overall function of brake pedal position switch circuit. During this check, a DTC might not be confirmed.

    1. Turn ignition switch ON.

    2. Check the voltage between ECM harness connector terminals as per the following conditions.

      ECM

      Condition

      Voltage

      (Approx.)

      Connector

      +

      –

      Terminal

      E16

      150

      162

      Brake pedal

      Slightly depressed

      0 V

      Fully released

      Battery voltage

    Is the inspection result normal?

    YES-1 >>

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

    YES-2 >>

    Confirmation after repair: INSPECTION END

    NO >>

    Refer to DTC Diagnosis Procedure.

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK DTC PRIORITY

    If DTC P1572 is displayed with DTC P0605, perform the trouble diagnosis for DTC P0605.

    Is applicable DTC detected?

    YES >>

    Perform diagnosis of applicable. Refer to DTC Description.

    NO >>

    GO TO 2.

  2. CHECK BRAKE PEDAL POSITION SWITCH CIRCUIT

    With CONSULT

    1. Turn ignition switch ON.

    2. Select “BRAKE SW1” in “DATA MONITOR” mode of “ENGINE” using CONSULT.

    3. Check “BRAKE SW1” indication as per the following conditions.

      Monitor item

      Condition

      Indication

      BRAKE SW1

      Brake pedal

      Slightly depressed

      OFF

      Fully released

      ON

    Without CONSULT

    1. Turn ignition switch ON.

    2. Check the voltage between ECM harness connector terminals as per the following.

      ECM

      Condition

      Voltage

      (Approx.)

      Connector

      +

      –

      Terminal

      E16

      150

      162

      Brake pedal

      Slightly depressed

      0 V

      Fully released

      Battery voltage

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    GO TO 3.

  3. CHECK BRAKE PEDAL POSITION SWITCH POWER SUPPLY CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect brake pedal position switch harness connector.

    3. Turn ignition switch ON.

    4. Check the voltage between brake pedal position switch harness connector and ground.

      +

      −

      Voltage

      Brake pedal position switch

      Connector

      Terminal

      E84

      1

      Ground

      Battery voltage

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Perform the trouble diagnosis for power supply circuit.

  4. CHECK BRAKE PEDAL POSITION SWITCH INPUT SIGNAL CIRCUIT

    1. Disconnect ECM harness connector.

    2. Check the continuity between brake pedal position switch harness connector and ECM harness connector.

      Brake pedal position switch

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E84

      2

      E16

      150

      Existed

    3. Also check harness for short to ground and to power.

    Is the inspection result normal?

    YES >>

    GO TO 5.

    NO >>

    Repair or replace malfunctioning part.

  5. CHECK BRAKE PEDAL POSITION SWITCH

    Check the brake pedal position switch. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Replace brake pedal position switch. Refer to Removal and Installation.

    P1568 Icc Function
    Dtc Description DTC Description DTC DETECTION LOGIC ECM detects a difference between signals from ADAS control unit is out of specified range. DTC CONSULT screen terms (Trouble ...
    P1574 Ascd Vehicle Speed Sensor
    Dtc Description DTC Description The ECM receives two ASCD vehicle speed sensor signals via CAN communication line. One is sent from combination meter, and the other is from TCM ...

    Other materials:

    Component Parts
    Exterior Lighting System Component Parts Location Component Parts Location A. View of instrument panel B. M/T transmi ...

    Security systems
    Your Nissan Sentra may be equipped with two different types of security systems designed to enhance vehicle protection and theft deterrence: Vehicle security system (if so equipped) NISSAN Vehicle Immobilizer System Vehicle security system The vehicle security system on the Nissan Se ...

    B0012-55 Active Vent
    Dtc Description DTC Description DTC DETECTION LOGIC DTC No. CONSULT screen items (Trouble diagnosis content) DTC Detection Condition ...