LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Nissan-Datsun >> 2004 >> Pathfinder LE, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System >> 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 the indication of "BRAKE SW1" under the following conditions.
      Fig 1: Checking Overall Function I Of ASCD Brake Switch With CONSULT II
      G00781364Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 2: ASCD Brake Switch Condition And Indication Chart
      G00781365Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Turn ignition switch "ON".
    2. Check voltage between ECM terminal 108 and ground under the following conditions.
      Fig 3: Checking Overall Function Of ASCD Brake Switch Without CONSULT II
      G00781366Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 4: ASCD Brake Switch Condition And Indication Chart
      G00781367Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK GO TO 2.
    2. NG GO TO  3 .
  2. CHECK OVERALL FUNCTION-II 

    With CONSULT-II 

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

    Fig 5: Checking Overall Function-II Of ASCD Brake Switch With CONSULT II
    G00781368Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 6: ASCD Brake Switch Condition And Indication Chart
    G00781369Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

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

    Fig 7: Checking Overall Function-II Of ASCD Brake Switch Without CONSULT II
    G00781370Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 8: ASCD Brake Switch Condition And Indication Chart
    G00781371Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK INSPECTION END 
    2. NG GO TO  11 .
  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".
    4. Check voltage between ASCD brake switch terminal 1 and ground with CONSULT-II or tester.
      Fig 9: Checking Voltage Between ASCD Brake Switch Terminal 1 And Ground
      G00781372Courtesy of NISSAN MOTOR CO., U.S.A.

      Voltage: Battery voltage 

    OK or NG 

    1. OK (A/T models) GO TO  5 .
    2. OK (M/T models) GO TO  7 .
    3. NG GO TO 4.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Fuse block (J/B) connector M10
    • 7.5A fuse
    • Harness for open or short between ASCD brake switch and fuse
    1. Repair open circuit or short to ground or short to power 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 open to ground and short to power.

    OK or NG 

    1. OK GO TO  10 .
    2. NG GO TO 6.
  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M94, F27
    • Harness for open and short between ECM and ASCD brake switch
    1. Repair open circuit or short to ground or short to power in harness or connectors.
  7. CHECK ASCD CLUTCH SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch "OFF".
    2. Disconnect ASCD clutch switch harness connector.
    3. Disconnect ECM harness connector.
    4. Check harness continuity between ASCD brake switch terminal 2 and ASCD clutch switch terminal 1, ASCD clutch switch terminal 2 and ECM terminal 108.

      Refer to WIRING DIAGRAM  .

      Continuity should exist. 

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

    OK or NG 

    1. OK GO TO  9 .
    2. NG GO TO 8.
  8. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M94, F27
    • Harness for open and short between ASCD brake switch and ASCD clutch switch
    • Harness for open and short between ASCD clutch switch and ECM
    1. Repair open circuit or short to ground or short to power in harness or connectors.
  9. CHECK ASCD CLUTCH SWITCH 

    Refer to "COMPONENT INSPECTION  " .

    OK or NG 

    1. OK GO TO 10.
    2. NG Replace ASCD clutch switch.
  10. CHECK ASCD BRAKE SWITCH 

    Refer to "COMPONENT INSPECTION  " .

    OK or NG 

    1. OK GO TO  16 .
    2. NG Replace ASCD brake switch.
  11. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT 
    1. Turn ignition switch "OFF".
    2. Disconnect stop lamp switch harness connector.
    3. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-II or tester.

      A/T models 

      Fig 10: Checking Voltage Between Stop Lamp Switch Terminal 1 And Ground (A/T Model)
      G00781373Courtesy of NISSAN MOTOR CO., U.S.A.

      M/T models 

      Fig 11: Checking Voltage Between Stop Lamp Switch Terminal 1 And Ground (M/T Model)
      G00781374Courtesy of NISSAN MOTOR CO., U.S.A.

      Voltage: Battery voltage 

    OK or NG 

    1. OK GO TO  13 .
    2. NG GO TO 12.
  12. DETECT MALFUNCTIONING PART 

    Check the following.

    • Fuse block (J/B) connector M10
    • 10A fuse
    • Harness for open or short between stop lamp switch and fuse
    1. Repair open circuit or short to ground in harness or connectors.
  13. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between stop lamp switch terminal 2 and ECM terminal 101. Refer to WIRING DIAGRAM  .

      Continuity should exist 

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

    OK or NG 

    1. OK GO TO  15 .
    2. NG GO TO 14.
  14. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M94, F27
    • Harness for open or short between stop lamp switch and ECM
    1. 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 

    1. OK GO TO 16.
    2. NG Replace stop lamp switch.
  16. CHECK INTERMITTENT INCIDENT 

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  " .

    1. INSPECTION END 
scientia non olet · About LEMON Manuals