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Home >> Nissan-Datsun >> 2009 >> 350Z Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing >> ASCD Brake Switch >> Diagnosis Procedure >> A/T Models
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A/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: Slightly depressed OFF
      Brake 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: Slightly depressed Approximately 0V
      Brake pedal: Fully released Battery voltage

      OK or NG 

      OK: INSPECTION END 

      NG: GO TO 2.

      Fig 1: Checking Voltage Between ECM Terminal 126 And Ground
      G04875400Courtesy of NISSAN MOTOR CO., U.S.A.
  2. 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 2: Identifying ASCD Brake Switch Harness Connector
      G04875402Courtesy 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  4.

      NG: GO TO 3.

      Fig 3: Checking Voltage Between ASCD Brake Switch Terminal 1 And Ground
      G04875403Courtesy of NISSAN MOTOR CO., U.S.A.
  3. 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.

  4. 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 126 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  6.

      NG: GO TO 5.

  5. DETECT MALFUNCTIONING PART

    Check the following.

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

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

  6. CHECK ASCD BRAKE SWITCH

    Refer to "COMPONENT INSPECTION "

    OK or NG 

    OK: GO TO 7.

    NG: Replace ASCD brake switch.

  7. CHECK INTERMITTENT INCIDENT

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    INSPECTION END 

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