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Home >> Infiniti >> 2005 >> G35 Base, 2D Coupe, Standard >> Repair and Diagnosis >> Engine Performance >> Engine Control System - Coupe >> DTC P1572: ASCD Brake Switch >> Diagnostic Procedure >> A/T Models

A/T Models

  1. CHECK OVERALL FUNCTION-1 

    With CONSULT-II 

    1. Turn ignition switch ON.
    2. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT-II.
    3. Check "BRAKE SW1" indication under the following conditions.
    BRAKE SWITCH 1 INDICATION

    CONDITION INDICATION
    Brake pedal: Slightly depressed OFF
    Brake pedal: Fully released ON
    Fig 1: BRAKE SW1 Display In DATA MONITOR Mode With CONSULT-II - A/T
    G02334067Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 108 and ground under the following conditions.
    BRAKE SWITCH 1 VOLTAGE

    CONDITION VOLTAGE
    Brake pedal: Slightly depressed Approximately 0V
    Brake pedal: Fully released Battery voltage
    Fig 2: Checking Voltage Between ECM Terminal 108 & Ground - A/T
    G02334068Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  2.
    2. NG: GO TO  3
  2. CHECK OVERALL FUNCTION-II 

    With CONSULT-II 

    1. Select "BRAKE SW2" in "DATA MONITOR" mode with CONSULT-II.
    2. Check "BRAKE SW2" indication under the following conditions.
      BRAKE SWITCH 2 INDICATION

      CONDITION INDICATION
      Brake pedal: Fully released OFF
      Brake pedal: Slightly depressed ON
      Fig 3: BRAKE SW2 Display In DATA MONITOR Mode With CONSULT-II - A/T
      G02334069Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    Check voltage between ECM terminal 101 and ground under the following conditions.

    BRAKE SWITCH 2 VOLTAGE

    CONDITION VOLTAGE
    Brake pedal: Fully released Approximately 0V
    Brake pedal: Slightly depressed Battery voltage
    Fig 4: Checking Voltage Between ECM Terminal 101 & Ground - A/T
    G02334070Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  13.
    2. NG: GO TO  8
  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.
      Fig 5: Locating ASCD Brake Switch - Diagnostic Procedure (DTC P1572) - A/T
      G02334071Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between ASCD brake switch terminal 1 and ground with CONSULT-II or tester.
      Fig 6: Checking Voltage Between ASCD Brake Switch Terminal 1 & Ground - A/T
      G02334072Courtesy of NISSAN MOTOR CO., U.S.A.
      1. Voltage: Battery voltage 

    OK or NG 

    1. OK: GO TO  5
    2. NG: GO TO  4.
  4. 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
      1. Repair open circuit or short to ground or short to power 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 harness continuity between ECM terminal 108 and ASCD brake switch terminal 2.

      Refer to Wiring Diagram.

      1. Continuity should exist. 
    4. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO  7.
    2. NG: GO TO  6.
  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E10, F1
    • Harness for open or short between ECM and ASCD brake switch
      1. Repair open circuit or short to ground or short to power in harness or connectors.
  7. CHECK ASCD BRAKE SWITCH 

    Refer to Component Inspection .

    OK or NG 

    1. OK: GO TO  13.
    2. NG: Replace ASCD brake switch.
  8. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect stop lamp switch harness connector.
      Fig 7: Locating Stop Lamp Switch - A/T
      G02334073Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between stop lamp switch terminal 3 and ground with CONSULT -II or tester.
      1. Voltage: Battery voltage 
      Fig 8: Checking Voltage Between Stop Lamp Switch Terminal 3 & Ground - A/T
      G02334074Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  10.
    2. NG: GO TO  9.
  9. DETECT MALFUNCTIONING PART 

    Check the following.

    • Fuse block (J/B) connector E101
    • 10A fuse
    • Harness for open or short between stop lamp switch and fuse
      1. Repair open circuit or short to ground or short to power in harness or connectors.
  10. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between ECM terminal 101 and stop lamp switch terminal 4.

      Refer to Wiring Diagram.

      1. Continuity should exist. 
    3. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO  12.
    2. NG: GO TO  11.
  11. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E108, M15
    • Harness connectors M72, F102
    • Harness for open or short between ECM and stop lamp switch
      1. Repair open circuit or short to ground or short to power in harness or connectors.
  12. CHECK STOP LAMP SWITCH 

    Refer to Component Inspection .

    OK or NG 

    1. OK: GO TO  13.
    2. NG: Replace stop lamp switch.
  13. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    1. INSPECTION END 
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