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Nissan Sentra B18 (2020-2025) Service Manual: P1564 Ascd Steering Switch

Nissan Sentra B18 (2020-2025) Service Manual / Engine / Work Procedure (After Replacing Electric Throttle Control Actuator) / Dtc/circuit Diagnosis / P1564 Ascd Steering Switch

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

P1564

ASCD SW

(ASCD steering switch)

Diagnosis condition

—

Signal (terminal)

ASCD steering switch signal

Threshold

ECM detects that input signal from the ASCD steering switch is out of the specified range

Diagnosis delay time

—

POSSIBLE CAUSE

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

  1. CHECK DTC PRIORITY

    If DTC P1564 is displayed with DTC P0605, first 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.

    >>

    GO TO 3.

  3. PERFORM DTC CONFIRMATION PROCEDURE

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

    2. Press MAIN switch for at least 10 seconds, then release it and wait at least 10 seconds.

    3. Press CANCEL switch for at least 10 seconds, then release it and wait at least 10 seconds.

    4. Press RES + switch for at least 10 seconds, then release it and wait at least 10 seconds.

    5. Press SET − switch for at least 10 seconds, then release it and wait at least 10 seconds.

    6. Check DTC.

    Is DTC detected?

    YES >>

    Proceed 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 P1564 is displayed with DTC P0605, first 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 ASCD STEERING SWITCH CIRCUIT

    With CONSULT

    1. Turn ignition switch ON.

    2. Select “MAIN SW”, “CANCEL SW”, “RESUME/ACC SW” and “SET SW” in “DATA MONITOR” mode of “ENGINE” using CONSULT.

    3. Check each item indication as per the following conditions.

      Monitor item

      Condition

      Indication

      MAIN SW

      MAIN switch

      Pressed

      ON

      Released

      OFF

      CANCEL SW

      CANCEL switch

      Pressed

      ON

      Released

      OFF

      RESUME/ACC SW

      RES + switch

      Pressed

      ON

      Released

      OFF

      SET SW

      SET − switch

      Pressed

      ON

      Released

      OFF

    Without CONSULT

    1. Turn ignition switch ON.

    2. Check the voltage between ECM harness connector terminals.

      ECM

      Condition

      Voltage

      (Approx.)

      Connector

      +

      –

      Terminal

      E16

      144

      145

      MAIN switch: Pressed

      0 V

      CANCEL switch: Pressed

      1.0 V

      SET − switch: Pressed

      2.0 V

      RES + switch: Pressed

      3.0 V

      All ASCD steering switches: Released

      4.0 V

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    GO TO 3.

  3. CHECK ASCD STEERING SWITCH GROUND CIRCUIT

    1. Turn ignition switch OFF.

    2. Disconnect ECM harness connector.

    3. Disconnect combination switch (spiral cable) harness connector.

    4. Check the continuity between combination switch (spiral cable) and ECM harness connector.

      Combination switch

      (Spiral cable)

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      M30

      1

      E16

      145

      Existed

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

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Repair or replace malfunctioning part.

  4. CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT

    1. Check the continuity between ECM harness connector and combination switch.

      Combination switch

      (Spiral cable)

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      M30

      8

      E16

      144

      Existed

    2. 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 ASCD STEERING SWITCH

    Check ASCD steering switch. Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    INSPECTION END

    NO >>

    Replace ASCD steering switch. Refer to Removal and Installation.

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