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Home >> Nissan-Datsun >> 2010 >> Cube Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0643 To P2A00 >> P1572 ASCD Brake Switch >> Diagnosis Procedure

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.
    MONITOR ITEM CONDITION CHART

    Monitor item Condition Indication
    BRAKE SW1 Brake pedal (CVT)
    Brake pedal and clutch pedal (M/T)    		 Slightly depressed OFF
    Fully released ON

    Without CONSULT-III 

    1. Turn ignition switch ON.
    2. Check the voltage between ECM harness connector terminals.
    TERMINAL VOLTAGE REFERENCE CHART

    ECM Condition Voltage
    Connector + -
    Terminal Terminal
    E16 100 (ASCD brake switch signal) 108 Brake pedal (CVT)
    Brake pedal and clutch pedal (M/T)    		 Slightly depressed Approx. 0 V
    Fully released Battery voltage

    Is the inspection result normal? 

    YES: GO TO 2.

    NO: GO TO  3.

  2. CHECK OVERALL FUNCTION-II

    With CONSULT-III 

    Select "BRAKE SW2" and check indication in "DATA MONITOR" mode with CONSULT-III.

    MONITOR ITEM CONDITION CHART

    Monitor item Condition Indication
    BRAKE SW2 Brake pedal Slightly depressed ON
    Fully released OFF

    Without CONSULT-III 

    Check the voltage between ECM harness connector terminals.

    TERMINAL VOLTAGE REFERENCE CHART

    ECM Condition Voltage
    Connector + -
    Terminal Terminal
    E16 99 (Stop lamp switch signal) 108 Brake pedal Slightly depressed Battery voltage
    Fully released Approx. 0 V

    Is the inspection result normal? 

    YES: GO TO  16.

    NO: GO TO  11.

  3. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT-I
    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.
    TERMINAL VOLTAGE REFERENCE CHART

    ASCD brake switch Ground Voltage
    Connector Terminal
    E112 1 Ground Battery voltage

    Is the inspection result normal? 

    YES: GO TO  9.

    NO-1: CVT models: GO TO 4.

    NO-2: M/T models: GO TO  5.

  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E105, M77
    • 10 A fuse (No. 2)
    • 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.

  5. CHECK ASCD CLUTCH SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect ASCD clutch switch harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between ASCD clutch switch harness connector and ground.
    TERMINAL VOLTAGE REFERENCE CHART

    ASCD brake switch Ground Voltage
    Connector Terminal
    E111 3 Ground Battery voltage

    Is the inspection result normal? 

    YES: GO TO  7.

    NO: GO TO 6.

  6. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E105, M77
    • 10 A fuse (No. 2)
    • Harness for open or short between ASCD clutch switch and fuse

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

  7. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT-II
    1. Turn ignition switch OFF.
    2. Disconnect ASCD brake switch harness connector.
    3. Check the continuity between ASCD clutch switch harness connector and ASCD brake switch harness connector.
      TERMINAL CONTINUITY REFERENCE CHART

      ASCD clutch switch ASCD brake switch Continuity
      Connector Terminal Connector Terminal
      E111 4 E112 1 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO 8.

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

  8. CHECK ASCD CLUTCH SWITCH

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

    Is the inspection result normal? 

    YES: GO TO  16.

    NO: Replace ASCD clutch switch.

  9. 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.
      TERMINAL CONTINUITY REFERENCE CHART

      ASCD clutch switch ECM Continuity
      Connector Terminal Connector Terminal
      E112 2 E16 100 Existed
    4. 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  16.

    NO: Replace ASCD brake switch.

  11. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect stop lamp switch harness connector.
    3. Check the voltage between stop lamp switch harness connector and ground.
    TERMINAL VOLTAGE REFERENCE CHART

    Stop lamp switch Ground Voltage
    Connector Terminal
    E114 (M/T)
    E115 (CVT)    		 1 Ground Battery voltage

    Is the inspection result normal? 

    YES: GO TO  13.

    NO: GO TO 12.

  12. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E105, M77
    • 10A fuse (No. 11)
    • 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.

  13. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Disconnect ECM harness connector.
    2. Check the continuity between ECM harness connector and stop lamp switch harness connector.
      TERMINAL CONTINUITY REFERENCE CHART

      ECM Stop lamp switch Continuity
      Connector Terminal Connector Terminal
      E16 99 E114 (M/T)
      E115 (CVT)      		 2 Existed
    3. Also check harness for short to ground and short to power.

    Is the inspection result normal? 

    YES: GO TO  15.

    NG: GO TO 14.

  14. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness for open or short between ECM and stop lamp switch

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

  15. CHECK STOP LAMP SWITCH

    Refer to "COMPONENT INSPECTION (STOP LAMP SWITCH) ".

    Is the inspection result normal? 

    YES: GO TO 16.

    NO: Replace stop lamp switch.

  16. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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