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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 2381 (Engine Control System - Component Testing (VK56DE)) >> ASCD Brake Switch >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK OVERALL FUNCTION-I

    With CONSULT 

    1. Turn ignition switch ON.
    2. Select "BRAKE SW 1" in "DATA MONITOR" mode with CONSULT.
    3. Check "BRAKE SW 1" indication under the following conditions.
    CONDITION INDICATION
    Brake pedal: Fully released ON
    Brake pedal: Slightly depressed OFF

    Without CONSULT 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 108 and ground under the following conditions.
    CONDITION VOLTAGE
    Brake pedal: Fully released Battery voltage
    Brake pedal: Slightly depressed Approximately 0 V
    Fig 1: Checking Voltage Between ECM Terminal 108 And Ground
    G08165240Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: INSPECTION END

    NG: GO TO 2.

  2. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect ASCD brake switch harness connector.
    3. Turn ignition switch ON.
      Fig 2: Identifying ASCD Brake Switch, Brake Pedal And Stop Lamp Switch
      G08165241Courtesy of NISSAN NORTH AMERICA, INC.
    4. Check voltage between ASCD brake switch terminal 1 and ground with CONSULT or tester.

    Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  4.

    NG: GO TO 3.

    Fig 3: Checking Voltage Between ASCD Brake Switch Harness Connector Terminal 1 And Ground Using Tester
    G08165242Courtesy of NISSAN NORTH AMERICA, INC.
  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E160
    • 10 A fuse (No. 12)
    • Harness for open or short between ASCD brake switch and fuse

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

  4. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between ECM terminal 108 and ASCD brake switch terminal 2.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

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

    OK or NG 

    OK: GO TO 5.

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

  5. CHECK ASCD BRAKE SWITCH

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 6.

    NG: Replace ASCD brake switch. Refer to REMOVAL AND INSTALLATION .

  6. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    >> INSPECTION END 

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