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Home >> Nissan-Datsun >> 2012 >> 370Z Base, 2D Convertible, Automatic Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1087 Through P2A03 >> DTC P1572: ASCD Brake Switch >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK OVERALL FUNCTION-I

    With CONSULT 

    1. Turn ignition switch ON.
    2. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT.
    3. Check "BRAKE SW1" indication under the following conditions.
      Monitor item Condition Indication
      BRAKE SW1 Brake pedal (A/T models or M/T and synchrorev match mode)
      Brake pedal and clutch pedal (M/T models without synchrorev match mode)      		 Slightly depressed OFF
      Brake pedal (A/T models or M/T and synchrorev match mode)
      Brake pedal or clutch pedal (M/T models without synchrorev match mode)      		 Fully released ON

    Without CONSULT 

    1. Turn ignition switch ON.
    2. Check the voltage between ECM harness connector terminals as per the following.
      ECM Condition Voltage (V)
      Connector + -
      Terminal Terminal
      M107 126 (ASCD brake switch signal) 128 Brake pedal (A/T models or M/T and synchrorev match mode)
      Brake pedal and clutch pedal (M/T models without synchrorev match mode)      		 Slightly depressed Approx. 0
      Brake pedal (A/T models or M/T and synchrorev match mode)
      Brake pedal or clutch pedal (M/T models without synchrorev match mode)      		 Fully released Battery voltage

      Is the inspection result normal? 

      YES: GO TO 2.

      NO-1: A/T models or M/T and synchrorev match mode: GO TO  3.

      NO-2: M/T models without synchrorev match mode: GO TO  8.

  2. CHECK OVERALL FUNCTION-II

    With CONSULT 

    Select "BRAKE SW2" and check indication under the following conditions.

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

    Without CONSULT 

    Check the voltage between ECM harness connector terminals as per the following.

    ECM Condition Voltage (V)
    Connector + -
    Terminal Terminal
    M107 122 (Stop lamp switch signal) 128 Brake pedal Slightly depressed Battery voltage
    Fully released Approx. 0

    Is the inspection result normal? 

    YES: GO TO  21.

    NO: GO TO  16.

  3. 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.
      ASCD brake switch Ground Voltage
      Connector Terminal
      E109 1 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  5.

      NO: GO TO 4.

  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E103
    • 10 A fuse (No. 3)
    • Harness for open or short between ASCD brake switch and fuse

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

  5. 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.
      ASCD brake switch ECM Continuity
      Connector Terminal Connector Terminal
      E109 2 M107 126 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  7.

      NO: GO TO 6.

  6. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E106, M6
    • Harness for open or short between ECM and ASCD brake switch

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

  7. CHECK ASCD BRAKE SWITCH

    Refer to "COMPONENT INSPECTION (ASCD BRAKE SWITCH) "

    Is the inspection result normal? 

    YES: GO TO  21.

    NO: Replace ASCD brake switch.

  8. CHECK ASCD BRAKE SWITCH 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.
      ASCD brake switch Ground Condition Voltage (V)
      Connector Terminal
      E109 1 Ground Brake pedal Slightly depressed Approx. 0
      Fully released Battery voltage

      Is the inspection result normal? 

      YES: GO TO  13.

      NO: GO TO 9.

  9. CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect clutch pedal position switch harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between clutch pedal position switch harness connector and ground.
      Clutch pedal position switch Ground Voltage
      Connector Terminal
      E108 1 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  11.

      NO: GO TO 10.

  10. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E103
    • 10 A fuse (No. 3)
    • Harness for open or short between clutch pedal position switch and fuse

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

  11. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I
    1. Turn ignition switch OFF.
    2. Check the continuity between clutch pedal position switch harness connector and ASCD brake switch harness connector.
      Clutch pedal position switch ASCD brake switch Continuity
      Connector Terminal Connector Terminal
      E108 2 E109 1 Existed
    3. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO 12.

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

  12. CHECK CLUTCH PEDAL POSITION SWITCH

    Refer to "COMPONENT INSPECTION (CLUTCH PEDAL POSITION SWITCH) ".

    Is the inspection result normal? 

    YES: GO TO  21.

    NO: Replace clutch pedal position switch.

  13. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between ASCD brake switch harness connector and ECM harness connector.
      ASCD brake switch ECM Continuity
      Connector Terminal Connector Terminal
      E109 2 M107 126 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  15.

      NO: GO TO 14.

  14. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E106, M6
    • Harness for open or short between ECM and ASCD brake switch

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

  15. CHECK ASCD BRAKE SWITCH

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

    Is the inspection result normal? 

    YES: GO TO  21.

    NO: Replace ASCD brake switch.

  16. 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.
      Stop lamp switch Ground Voltage
      Connector Terminal
      E110 1 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  18.

      NO: GO TO 17.

  17. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E103
    • 10 A fuse (No. 7)
    • Harness for open or short between stop lamp switch and battery

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

  18. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Disconnect ECM harness connector.
    2. Check the continuity between stop lamp switch harness connector and ECM harness connector.
      Stop lamp switch ECM Continuity
      Connector Terminal Connector Terminal
      E110 2 M107 122 Existed
    3. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES: GO TO  20.

      NO: GO TO 19.

  19. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connectors E103, M2
    • Harness for open or short between ECM and stop lamp switch

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

  20. CHECK STOP LAMP SWITCH

    Refer to "COMPONENT INSPECTION (STOP LAMP SWITCH) "

    Is the inspection result normal? 

    YES: GO TO 21.

    NO: Replace stop lamp switch.

  21. CHECK INTERMITTENT INCIDENT

    Refer to INTERMITTENT INCIDENT .

    INSPECTION END

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