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Home › Nissan-Datsun › 2012 › Pathfinder S, RWD › Repair and Diagnosis › Engine Performance › System › Engine Control System - Component Testing (VQ40DE) › ASCD Brake Switch › Diagnosis Procedure

Diagnosis Procedure

  1. CHECK OVERALL FUNCTION-I

    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.
    Condition INDICATION
    When brake pedal: Slightly depressed OFF
    When brake pedal: Fully released ON

    Without CONSULT 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 108 and ground under the following conditions.
    Condition VOLTAGE
    When brake pedal: Slightly depressed Approximately 0V
    When brake pedal: Fully released Battery voltage
    Fig 1: Checking Voltage Between ECM Terminal 108 And Ground
    G08170775Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: GO TO 2.

    NG: GO TO  3.

  2. CHECK OVERALL FUNCTION-II

    With CONSULT 

    Check "BRAKE SW2" indication in "DATA MONITOR" mode.

    Condition INDICATION
    When brake pedal: Fully released OFF
    When brake pedal: Slightly depressed ON

    Without CONSULT 

    Check voltage between ECM terminal 101 and ground under the following conditions.

    Condition VOLTAGE
    When brake pedal: Fully released Approximately 0V
    When brake pedal: Slightly depressed Battery voltage
    Fig 2: Checking Voltage Between ECM Connector Terminal 101 And Ground
    G08170776Courtesy of NISSAN NORTH AMERICA, INC.

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  7.

  3. 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 3: Identifying ASCD Brake And Stop Lamp Switches With Brake Pedal
      G08170777Courtesy 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  5.

    NG: GO TO 4.

    Fig 4: Checking Voltage Between ASCD Brake Switch Harness Connector Terminal 1 And Ground Using Tester
    G08170778Courtesy of NISSAN NORTH AMERICA, INC.
  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E160
    • 10A fuse
    • Harness for open or short between ASCD brake switch and fuse

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

  5. 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 6.

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

  6. CHECK ASCD BRAKE SWITCH

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO  11.

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

  7. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect stop lamp switch harness connector.
      Fig 5: Identifying ASCD Brake And Stop Lamp Switches With Brake Pedal
      G08170779Courtesy of NISSAN NORTH AMERICA, INC.
    3. Check voltage between stop lamp switch terminal 1 and ground with CONSULT or tester.

    Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  9.

    NG: GO TO 8.

    Fig 6: Checking Voltage Between Stop Lamp Switch Terminal 1 And Ground Using Tester
    G08170780Courtesy of NISSAN NORTH AMERICA, INC.
  8. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E160
    • 10A fuse
    • Harness for open or short between stop lamp switch and battery

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

  9. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

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

    OK or NG 

    OK: GO TO 10.

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

  10. CHECK STOP LAMP SWITCH

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 11.

    NG: Replace stop lamp switch. Refer to "REMOVAL AND INSTALLATION ".

  11. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END 

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