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Home >> Nissan-Datsun >> 2011 >> Frontier SL, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing (VQ40DE) >> ASCD Brake Switch >> Diagnosis Procedure >> M/T Models
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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 REFERENCE CHART

      CONDITION INDICATION
      Clutch pedal and/or brake pedal: Slightly depressed OFF
      Clutch pedal and brake 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 REFERENCE CHART

      CONDITION VOLTAGE
      Clutch pedal and/or brake pedal: Slightly depressed Approximately 0V
      Clutch pedal and brake pedal: Fully released Battery voltage
      Fig 1: Checking Voltage Between ECM Terminal 108 (ASCD Brake Switch Signal) And Ground
      G07121447Courtesy 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.

    VOLTAGE REFERENCE CHART

    CONDITION VOLTAGE
    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 REFERENCE CHART

    CONDITION VOLTAGE
    Brake pedal: Fully released Approximately 0V
    Brake pedal: Slightly depressed Battery voltage
    Fig 2: Checking Voltage Between ECM Terminal 101 (ASCD Brake Switch Signal) And Ground
    G07121448Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    OK: INSPECTION END 

    NG: Go to  10.

  3. CHECK ASCD CLUTCH SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect ASCD clutch switch harness connector.
    3. Turn ignition switch ON.
      Fig 3: Location Of ASCD Clutch Switch & Clutch Pedal
      G07121449Courtesy 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 REFERENCE CHART

      CONDITION VOLTAGE
      Brake pedal: Slightly depressed Approximately 0V
      Brake pedal: Fully released Battery voltage
      Fig 4: Checking Voltage Between ASCD Clutch Switch Terminal 1 And Ground
      G07121450Courtesy 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: Location Of ASCD Brake, Stop Lamp Switches & Brake Pedal
      G07121451Courtesy 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 

      OK or NG 

      OK: Go to  6.

      NG: Go to 5.

      Fig 6: Checking Voltage Between ASCD Brake Switch Terminal 1 And Ground
      G07121452Courtesy of NISSAN MOTOR CO., U.S.A.
  5. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E160
    • 10 A fuse (No. 12)
    • Harness for open or short between ASCD brake switch and fuse

      Repair open circuit or short to ground 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. Refer to "EXPLODED VIEW ".

  8. 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 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. Refer to "EXPLODED VIEW ".

  10. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect stop lamp switch harness connector.
      Fig 7: Location Of ASCD Brake, Stop Lamp Switches & Brake Pedal
      G07121453Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between stop lamp switch terminal 2 and ground with CONSULT-II or tester.

      Voltage: Battery voltage 

      Fig 8: Checking Voltage Between Stop Lamp Switch Terminal 2 And Ground
      G07121454Courtesy 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
    • 10 A fuse (No. 20)
    • 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.

  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. Refer to "EXPLODED VIEW ".

  14. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END 

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