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Home >> Nissan-Datsun >> 2009 >> 350Z Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0643 To P2A03 >> DTC P1572 ASCD Brake Switch >> Diagnosis Procedure >> M/T Models

M/T Models

  1. CHECK OVERALL FUNCTION-I

    With CONSULT-III 

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

      CONDITION INDICATION
      Brake pedal and/or clutch pedal: Slightly depressed OFF
      Brake pedal and clutch pedal: Fully released ON

    Without CONSULT-III 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 126 and ground under the following conditions.
      VOLTAGE SPECIFICATION

      CONDITION VOLTAGE
      Brake pedal and/or clutch pedal: Slightly depressed Approximately 0V
      Brake pedal and clutch pedal: Fully released Battery voltage
      Fig 1: Checking Voltage Between ECM Terminal 126 And Ground
      G04875400Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK: GO TO 2.

      NG: GO TO  3.

  2. CHECK OVERALL FUNCTION-II

    With CONSULT-III 

    1. Select "BRAKE SW2" in "DATA MONITOR" mode with CONSULT-III.
    2. Check "BRAKE SW2" indication under the following conditions.
      CONDITION CHART

      CONDITION INDICATION
      Brake pedal: Fully released OFF
      Brake pedal: Slightly depressed ON

      Without CONSULT-III 

      Check voltage between ECM terminal 122 and ground under the following conditions.

      VOLTAGE SPECIFICATION

      CONDITION VOLTAGE
      Brake pedal: Fully released Approximately 0V
      Brake pedal: Slightly depressed Battery voltage
      Fig 2: Checking Voltage Between ECM Terminal 122 And Ground
      G04875401Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK: GO TO  16.

      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 3: Identifying ASCD Brake Switch And Clutch Pedal
      G04875397Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between ASCD clutch switch terminal 1 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

      Fig 4: Checking Voltage Between ASCD Clutch Switch Terminal 1 And Ground
      G04875409Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK: GO TO  8.

      NG: GO TO 4.

  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 5: Identifying ASCD Brake Switch And Clutch Pedal
      G04875397Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between ASCD brake switch terminal 1 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

      Fig 6: Checking Voltage Between ASCD Brake Switch Terminal 1 And Ground
      G04875403Courtesy 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 E101
    • 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.

  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 

      OK: GO TO 7.

      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 

    OK: GO TO  16.

    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 126.

      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  10.

      NG: GO TO 9.

  9. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E108, M15
    • Harness for open or short between ECM and ASCD clutch switch

      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 

    OK: GO TO  16.

    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 7: Identifying ASCD Brake Switch And Clutch Pedal
      G04875397Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between stop lamp switch terminal 3 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

      Fig 8: Checking Voltage Between Stop Lamp Switch Terminal 3 And Ground
      G04875405Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK: GO TO  13.

      NG: GO TO 12.

  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 battery

      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 122 and stop lamp switch terminal 4.

      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: GO TO 14.

  14. DETECT MALFUNCTIONING PART

    Check the following.

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

      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 

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