LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 2006 >> X-Trail LE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing >> ASCD Brake Switch >> Diagnostic Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic Procedure

  1. CHECK OVERALL FUNCTION-I 

    With CONSULT-II 

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

    A/T models 

    BRAKE PEDAL CONDITION CHART

    Condition INDICATION
    Brake pedal: Slightly depressed OFF
    Brake pedal: Fully released ON
    Fig 1: Generic Scan Tool - Active Test
    G06152881Courtesy of NISSAN MOTOR CO., U.S.A.

    M/T models 

    CONDITION CHART

    Condition INDICATION
    Clutch pedal or brake pedal: Slightly depressed OFF
    Clutch pedal and brake pedal: Fully released ON

    Without CONSULT-II 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 108 and ground under the following conditions.

    A/T models 

    VOLTAGE SPECIFICATION

    Condition VOLTAGE
    Brake pedal: Slightly depressed Approximately 0V
    Brake pedal: Fully released Battery voltage
    Fig 2: Checking Voltage Between ECM Terminal 108 And Ground
    G06152882Courtesy of NISSAN MOTOR CO., U.S.A.

    M/T models 

    VOLTAGE SPECIFICATION

    Condition VOLTAGE
    Clutch pedal or brake pedal: Slightly depressed Approximately 0V
    Clutch pedal and brake pedal: Fully released Battery voltage

    OK or NG 

    OK: GO TO 2.

    NG (M/T models) : GO TO  3.

    NG (A/T models) : GO TO  8.

  2. CHECK OVERALL FUNCTION-II 

    With CONSULT-II 

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

    DATA MONITOR CONDITION CHART

    Condition INDICATION
    Brake pedal: Fully released OFF
    Brake pedal: Slightly depressed ON
    Fig 3: Generic Scan Tool - Data Monitor
    G06153025Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

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

    VOLTAGE SPECIFICATION

    Condition VOLTAGE
    Brake pedal: Fully released Approximately 0V
    Brake pedal: Slightly depressed Battery voltage
    Fig 4: Checking Voltage Between ECM Terminal 101 And Ground
    G06153026Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO  13.

  3. CHECK ASCD CLUTCH SWITCH CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ASCD brake switch harness connector.
    3. Turn ignition switch ON.
      Fig 5: Identifying Stop Lamp Switch Harness Connector And Brake Pedal
      G06152888Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between ASCD brake switch terminal 1 and ground under the following conditions with CONSULT-II or tester.
    VOLTAGE SPECIFICATION

    Condition VOLTAGE
    Clutch pedal: Fully released Battery voltage
    Clutch pedal: Slightly depressed Approx. 0V
    Fig 6: Checking Voltage Between ASCD Brake Switch Terminal 1 And Ground
    G06152886Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK : GO TO  10.

    NG: GO TO 4.

  4. CHECK ASCD CLUTCH SWITCH POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ASCD clutch switch harness connector.
    3. Turn ignition switch ON.
    4. Check voltage between ASCD clutch switch terminal 1 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    Fig 7: Checking Voltage Between ASCD Clutch Switch Terminal 1 And Ground
    G06152887Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  6.

    NG: GO TO 5.

  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Fuse block (J/B) connector M2
    • 10A fuse
    • Harness for open or short between ASCD clutch switch and fuse

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

  6. CHECK ASCD CLUTCH SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Check harness continuity between ASCD clutch switch terminal 2 and ASCD brake switch terminal 1. 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 7.

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

  7. CHECK ASCD CLUTCH SWITCH 

    Refer to "COMPONENT INSPECTION "

    OK or NG 

    OK: GO TO 18.

    NG: Replace ASCD clutch switch.

  8. 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 8: Identifying Stop Lamp Switch Harness Connector And Brake Pedal
      G06152888Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between ASCD brake switch terminal 1 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    Fig 9: Checking Voltage Between ASCD Brake Switch Terminal 1 And Ground
    G06152889Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: GO TO  10.

    NG: GO TO 9.

  9. DETECT MALFUNCTIONING PART 

    Check the following.

    • Fuse block (J/B) connector M2
    • 10A fuse
    • 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.

  10. 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 or short to power.

    OK or NG 

    OK: GO TO  11.

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

  11. CHECK ASCD BRAKE SWITCH 

    Refer to "COMPONENT INSPECTION "

    OK or NG 

    OK: GO TO  16.

    NG: Replace ASCD brake switch.

  12. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT 
    1. Disconnect stop lamp switch harness connector.
      Fig 10: Identifying Stop Lamp Switch Harness Connector And Brake Pedal
      G06152890Courtesy of NISSAN MOTOR CO., U.S.A.
    2. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-II or tester.
    Fig 11: Checking Voltage Between Stop Lamp Switch Terminal 1 And Ground
    G06152891Courtesy of NISSAN MOTOR CO., U.S.A.

    Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  14.

    NG: GO TO 13.

  13. DETECT MALFUNCTIONING PART 

    Check the following.

    • Fuse block (J/B) connector M2
    • 10A fuse
    • Harness for open or short between stop lamp switch and fuse

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

  14. 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 15.

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

  15. CHECK STOP LAMP SWITCH 

    Refer to "COMPONENT INSPECTION "

    OK or NG 

    OK: GO TO 16.

    NG: Replace stop lamp switch.

  16. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    INSPECTION END 

scientia non olet · About LEMON Manuals