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Home >> Nissan-Datsun >> 2009 >> Versa Base, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing >> ASCD Brake Switch >> Diagnosis Procedure
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Diagnosis Procedure

  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.

      M/T models 

      INDICATION CONDITIONS REFERENCE CHART

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

      A/T and CVT models 

      INDICATION CONDITIONS REFERENCE CHART

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

    Without CONSULT-III 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 100 and ground under the following conditions.

      M/T models 

      VOLTAGE REFERENCE CHART

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

      A/T and CVT models 

      VOLTAGE REFERENCE CHART

      CONDITION VOLTAGE
      Brake pedal: Slightly depressed Approximately 0V
      Brake pedal: Fully released Battery voltage
      Fig 1: Checking Voltage Between ECM Terminal 100 And Ground
      G04925535Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      OK : GO TO 2.

      NG (M/T models) : GO TO  3.

      NG (A/T and CVT models) : GO TO  4.

  2. CHECK OVERALL FUNCTION-II

    With CONSULT-III 

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

    INDICATION CONDITIONS REFERENCE CHART

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

    Without CONSULT-III 

    Check voltage between ECM terminal 99 and ground under the following conditions.

    VOLTAGE REFERENCE CHART

    CONDITION VOLTAGE
    Brake pedal: Fully released Approximately 0V
    Brake pedal: Slightly depressed Battery voltage
    Fig 2: Checking Voltage Between ECM Terminal 99 And Ground
    G04900663Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK : GO TO  15.

    NG : GO TO  11.

  3. CHECK ASCD CLUTCH SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect ASCD clutch switch (1) harness connector.
      • Clutch pedal (2)
    3. Turn ignition switch ON.
      Fig 3: Identifying ASCD Brake Switch And Stop Lamp Switch
      G05932898Courtesy 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 

      OK or NG 

      OK : GO TO  9.

      NG : GO TO 4.

      Fig 4: Checking Voltage Between ASCD Brake Switch Terminal 1 And Ground
      G04875403Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK ASCD BRAKE SWITCH POWER SUPPLY
    1. Turn ignition switch OFF.
    2. Disconnect ASCD brake switch (2) harness connector.
      • Stop lamp switch (1)
    3. Turn ignition switch ON.
      Fig 5: Identifying ASCD Brake Switch And Stop Lamp Switch
      G05932898Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between ASCD brake switch terminal 1 and ground under the following conditions with CONSULT-III or tester.
      VOLTAGE REFERENCE CHART

      CONDITION VOLTAGE
      Clutch pedal: Fully released Battery voltage
      Clutch pedal: Slightly depressed Approx. 0V

      OK or NG 

      OK (M/T models) : GO TO  6.

      OK (A/T and CVT models) : GO TO  7.

      NG : GO TO 5.

      Fig 6: Checking Voltage Between ASCD Brake Switch Terminal 1 And Ground
      G04875403Courtesy of NISSAN MOTOR CO., U.S.A.
  5. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors M69, E7
    • 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 CLUTCH 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  8.

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

  7. 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 100 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 8.

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

  8. CHECK ASCD BRAKE SWITCH

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK : GO TO  15.

    NG : Replace ASCD brake switch.

  9. 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 ECM terminal 100 and ASCD clutch 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 10.

      NG : 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  15.

    NG : Replace ASCD clutch switch.

  11. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect stop lamp switch (1) harness connector.
      • ASCD brake switch (2)
        Fig 7: Identifying ASCD Brake Switch And Stop Lamp Switch
        G05932972Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-III or tester.
      Fig 8: Checking Voltage Between Stop Lamp Switch Terminal 1 And Ground
      G05932907Courtesy of NISSAN MOTOR CO., U.S.A.

      Voltage: Battery voltage 

      OK or NG 

      OK : GO TO  13.

      NG : GO TO 12.

  12. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors M69, E7
    • 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 99 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 14.

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

  14. CHECK STOP LAMP SWITCH

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK : GO TO 15.

    NG : Replace stop lamp switch.

  15. CHECK INTERMITTENT INCIDENT

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    INSPECTION END 

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