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Home >> Infiniti >> 2010 >> M45 Base >> 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.
    INDICATION CONDITION CHART

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

    Without CONSULT-III 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 108 and ground under the following conditions.
    VOLTAGE CONNECTOR TERMINALS REFERENCE CHART

    CONDITION VOLTAGE
    Brake pedal: Fully released Battery voltage
    Brake pedal: Slightly depressed Approximately 0 V

    OK or NG 

    OK: INSPECTION END 

    NG: GO TO 2.

    Fig 1: Checking Voltage Between ECM Terminal 108 And Ground
    G04900670Courtesy 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 (2) harness connector.
      • Stop lamp switch (1)
    3. Turn ignition switch ON.
      Fig 2: Identifying ASCD Brake Switch And Stop Lamp Switch
      G05210064Courtesy 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 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 E102
    • 10 A 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 108 and ASCD brake switch terminal 2.

      Refer to SYSTEM WIRING DIAGRAMS article.

      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 "DIAGNOSIS PROCEDURE ".

    INSPECTION END 

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