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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 11 (Engine Control System (DTC/Circuit Diagnosis) (5.6L) (5 Of 6)) >> DTC/Circuit Diagnosis >> DTC P1572: Brake Pedal Position Switch >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DTC PRIORITY 

    If DTC P1572 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 OVERALL FUNCTION-I 

    SYMBOL WITH CONSULT

    1. Turn ignition switch ON.
    2. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT.
    3. Check "BRAKE SW1" indication under the following conditions.

      Monitor item

      Condition

      Indication

      BRAKE SW1

      (Brake pedal position switch)

      Brake pedal

      Slightly depressed

      OFF

      Fully released

      ON

    SYMBOL WITHOUT CONSULT

    1. Turn ignition switch ON.
    2. Check the voltage between ECM harness connector terminals as per the following.

      ECM

      Condition

      Voltage (V)

      Connector

      +

      -

      Terminal

      Terminal

      E77

      140

      (Brake pedal position switch signal)

      152

      Brake pedal

      Slightly depressed

      Approx. 0

      Fully released

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    GO TO 4.

  3. CHECK OVERALL FUNCTION-II 

    SYMBOL WITH CONSULT

    Select "BRAKE SW2" and check indication under the following conditions.

    Monitor item

    Condition

    Indication

    BRAKE SW2

    (Stop lamp switch)

    Brake pedal

    Slightly depressed

    ON

    Fully released

    OFF

    SYMBOL WITHOUT CONSULT

    Check the voltage between ECM harness connector terminals under the following conditions.

    ECM

    Condition

    Voltage (V)

    Connector

    +

    -

    Terminal

    Terminal

    E77

    139

    (Stop lamp switch signal)

    152

    Brake pedal

    Slightly depressed

    Battery voltage

    Fully released

    Approx. 0

    Is the inspection result normal?

    YES

    GO TO 13.

    NO

    GO TO 9.

  4. 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.

      Brake pedal position switch

      Ground

      Voltage

      Connector

      Terminal

      E37

      1

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 6.

    NO

    GO TO 5.

  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • 10 A fuse (No. 12)
    • Harness for open or short between brake pedal position switch and fuse
    • Loose or poor connection for each connector and harness

    Repair open circuit or short to ground in harness or connectors.

  6. CHECK BRAKE PEDAL POSITION SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between brake pedal position switch harness connector and ECM harness connector.

      Brake pedal position switch

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E37

      2

      E77

      140

      Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES

    GO TO 8.

    NO

    GO TO 7.

  7. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness for open or short between ECM and brake pedal position switch
    • Loose or poor connection for each connector and harness

    Repair open circuit, short to ground or short to power in harness or connectors.

  8. CHECK BRAKE PEDAL POSITION SWITCH 

    Refer to Component Inspection (Brake Pedal Position Switch) 

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Replace brake pedal position switch.

  9. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect stop lamp switch harness connector.
    3. Check the voltage between stop lamp switch harness connector and ground.

      Stop lamp switch

      Ground

      Voltage

      Connector

      Terminal

      E38

      1

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 11.

    NO

    GO TO 10.

  10. DETECT MALFUNCTIONING PART 

    Check the following.

    • 10 A fuse (No. 21)
    • Harness for open or short between stop lamp switch and battery
    • Loose or poor connection for each connector and harness

    Repair open circuit, short to ground or short to power in harness or connectors.

  11. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check the continuity between stop lamp switch harness connector and ECM harness connector.

      Stop lamp switch

      ECM

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      E38

      2

      E77

      139

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

    Is the inspection result normal?

    YES

    GO TO 13.

    NO

    GO TO 12.

  12. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness for open or short between ECM and stop lamp switch
    • Loose or poor connection for each connector and harness

    Repair open circuit, short to ground or short to power in harness or connectors.

  13. CHECK STOP LAMP SWITCH 

    Refer to Component Inspection (Stop Lamp Switch) .

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Replace stop lamp switch.

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