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Home >> Nissan-Datsun >> 2007 >> Altima Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Component Testing (Qr25DE) (Except For CALIFORNIA) >> ASCD Brake Switch >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK OVERALL FUNCTION-I

    Check which type of transmission the vehicle is equipped with.

    Is the inspection result normal? 

    CVT: GO TO 2.

    M/T: GO TO  6.

  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.
    4. Check the voltage between ASCD brake switch harness connector and ground.
      TERMINALS VOLTAGE REFERENCE

      ASCD brake switch Ground Voltage
      Connector Terminal
      E37 1 Ground Battery voltage

    Is the inspection result normal? 

    YES: GO TO  4.

    NO: GO TO 3.

  3. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E6
    • Junction block connector E44, E46
    • 10A fuse (No. 3)
    • 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 the continuity between ASCD brake switch harness connector and ECM harness connector.
      TERMINALS CONTINUITY REFERENCE

      ASCD brake switch ECM Continuity
      Connector Terminal Connector Terminal
      E37 2 E10 110 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: Repair open circuit or short to ground or short to power in harness or connectors.

  5. CHECK ASCD BRAKE SWITCH

    Refer to "COMPONENT INSPECTION (ASCD BRAKE SWITCH) ".

    Is the inspection result normal? 

    YES: GO TO  13.

    NO: Replace ASCD brake switch.

  6. CHECK ASCD BRAKE SWITCH CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect ASCD clutch switch harness connector.
    3. Turn ignition switch ON.
    4. Check the continuity between ASCD clutch switch harness connector and ground.
      VOLTAGE SPECIFICATION

      ASCD clutch switch Ground Condition Voltage (V)
      Connector Terminal
      E39 1 Ground Brake pedal Slightly depressed Approx. 0
      Fully released Battery voltage
    5. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  11.

    NO: GO TO 7.

  7. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect ASCD brake switch harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between ASCD brake switch harness connector and ground.
      TERMINALS VOLTAGE REFERENCE

      ASCD brake switch Ground Voltage
      Connector Terminal
      E37 1 Ground Battery voltage

    Is the inspection result normal? 

    YES: GO TO  9.

    NO: GO TO 8.

  8. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E6
    • Junction block connector E44, E46
    • 10A fuse (No. 3)
    • 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.

  9. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Check the continuity between ASCD brake switch harness connector and ASCD clutch switch harness connector.
      TERMINALS CONTINUITY REFERENCE

      ASCD brake switch ASCD clutch switch Continuity
      Connector Terminal Connector Terminal
      E37 2 E39 1 Existed
    3. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO 10.

    NO: Repair open circuit or short to ground or short to power in harness or connectors.

  10. CHECK ASCD BRAKE SWITCH

    Refer to "COMPONENT INSPECTION (ASCD BRAKE SWITCH) ".

    Is the inspection result normal? 

    YES: GO TO  13.

    NO: Replace ASCD brake switch.

  11. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector
    3. Check the continuity between ASCD clutch switch harness connector and ECM harness connector.
      TERMINALS CONTINUITY REFERENCE

      ASCD clutch switch ECM Continuity
      Connector Terminal Connector Terminal
      E39 2 E10 110 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO 12.

    NO: Repair open circuit or short to ground or short to power in harness or connectors.

  12. CHECK ASCD CLUTCH SWITCH

    Refer to "COMPONENT INSPECTION (ASCD CLUTCH SWITCH) ".

    Is the inspection result normal? 

    YES: GO TO 13.

    NO: Replace ASCD clutch switch.

  13. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    : INSPECTION END

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