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Home >> Nissan-Datsun >> 2008 >> Frontier XE >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (Qr25DE) >> Component Diagnosis >> 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.
      BRAKE SWITCH INDICATION REFERENCE

      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 108 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 108 And Ground
      G04900670Courtesy 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 

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

    BRAKE SWITCH INDICATION REFERENCE

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

    Without CONSULT-III 

    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 2: Checking Voltage Between ECM Terminal 101 And Ground
    G04895057Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK : INSPECTION END 

    NG : GO TO  10.

  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 Clutch Switch And Clutch Pedal
      G04895066Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between ASCD clutch switch terminal 1 and ground under the following conditions with CONSULT-III or tester.
      VOLTAGE SPECIFICATION

      CONDITION VOLTAGE
      Brake pedal: Fully released Battery voltage
      Brake pedal: Slightly depressed Approx. 0V
      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 Stop Lamp Switch
      G04895051Courtesy 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 E160
    • 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  14.

    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 ECM terminal 108 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 9.

    NG : 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 

    OK : GO TO  14.

    NG : Replace ASCD clutch switch

  10. 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 Stop Lamp Switch
      G04895051Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-III or tester.

      Voltage: Battery voltage 

      Fig 8: Checking Voltage Between Stop Lamp Switch Terminal 1 And Ground
      G04900676Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK : GO TO  12.

    NG : GO TO 11.

  11. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E160
    • 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.

  12. 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 13.

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

  13. CHECK STOP LAMP SWITCH

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK : GO TO 14.

    NG : Replace stop lamp switch.

  14. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END 

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