LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Infiniti >> 2004 >> G35 x >> Repair and Diagnosis >> Engine Performance >> System >> 2004.5 - Engine Control System - Component Testing - Sedan >> ASCD Brake Switch >> Diagnostic Procedure >> M/T Models
April 5, 2026: LEMON Manuals is launched! Read the announcement.

M/T Models

  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.
      BRAKE/CLUTCH PEDAL CONDITION AND INDICATION

      CONDITION INDICATION
      When brake pedal and/or clutch pedal are depressed OFF
      When brake pedal and clutch pedal are fully released ON
      Fig 1: Consult II Display
      G03325558Courtesy 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.
      BRAKE/CLUTCH PEDAL CONDITION AND VOLTAGE

      CONDITION VOLTAGE
      When brake pedal and/or clutch pedal are depressed Approximately 0V
      When brake pedal and clutch pedal are fully released Battery voltage
      Fig 2: Checking Voltage Between ECM Terminal 108 & Ground
      G03325559Courtesy 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 

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

    BRAKE PEDAL CONDITION AND INDICATION

    CONDITION INDICATION
    When brake pedal is released OFF
    When brake pedal is depressed ON
    Fig 3: Consult II Display
    G03325560Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

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

    BRAKE PEDAL CONDITION AND VOLTAGE

    CONDITION VOLTAGE
    When brake pedal is released Approximately 0V
    When brake pedal is depressed Battery voltage
    Fig 4: Checking Voltage Between ECM Terminal 101 & Ground
    G03325561Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: INSPECTION END 
    2. NG: GO TO  11.
  3. CHECK ASCD BRAKE SWITCH CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ASCD clutch switch harness connector.
    3. Turn ignition switch ON.
      Fig 5: Disconnecting ASCD Clutch Switch Harness Connector
      G03325562Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between ASCD clutch switch terminal 1 and ground under the following conditions with CONSULT-II or tester.
      BRAKE PEDAL CONDITION AND VOLTAGE

      CONDITION VOLTAGE
      When brake pedal is released Battery voltage
      When brake pedal is depressed Approximately 0V

    OK or NG

    1. OK: GO TO  8.
    2. NG: GO TO 4.
      Fig 6: Checking Voltage Between ASCD Clutch Switch Terminal 1 & Ground
      G03325563Courtesy of NISSAN MOTOR CO., U.S.A.
  4. 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 7: Disconnecting ASCD Brake Switch Harness Connector
      G03325564Courtesy 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 

    OK or NG

    1. OK: GO TO  6.
    2. NG: GO TO 5.
      Fig 8: Checking Voltage Between ASCD Brake Switch Terminal 1 & Ground
      G03325565Courtesy of NISSAN MOTOR CO., U.S.A.
  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Fuse block (J/B) connector E101
    • 10A 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.
  6. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Check harness continuity between ASCD brake switch terminal 2 and ASCD clutch 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

    1. OK: GO TO 7.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
  7. CHECK ASCD BRAKE SWITCH 

    Refer to "COMPONENT INSPECTION "

    OK or NG

    1. OK: GO TO  16.
    2. NG: Replace ASCD brake switch.
  8. CHECK ASCD CLUTCH SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between ASCD clutch switch terminal 2 and ECM terminal 108.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

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

    OK or NG

    1. OK: GO TO  10.
    2. NG: GO TO 9.
  9. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E10, F1
    • Harness for open or short between ECM and ASCD clutch switch
    1. : Repair open circuit or short to ground or short to power in harness or connectors.
  10. CHECK ASCD CLUTCH SWITCH 

    Refer to "COMPONENT INSPECTION ".

    OK or NG

    1. OK: GO TO  16.
    2. NG: Replace ASCD clutch switch.
  11. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect stop lamp switch harness connector.
      Fig 9: Disconnecting Stop Lamp Switch Harness Connector
      G03325566Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

    OK or NG

    1. OK: GO TO  13.
    2. NG: GO TO 12.
      Fig 10: Checking Voltage Between Stop Lamp Switch Terminal 1 & Ground
      G03325567Courtesy of NISSAN MOTOR CO., U.S.A.
  12. DETECT MALFUNCTIONING PART 

    Check the following.

    • Fuse block (J/B) connector E101
    • 10A fuse
    • Harness for open or short between stop lamp switch and fuse
    1. : Repair open circuit or short to ground or short to power 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 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

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

    Check the following.

    • Harness connectors E108, M15
    • Harness connectors M72, F102
    • Harness for open or short between ECM and stop lamp switch
    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