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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 597 (Engine Control System - Coupe) >> DTC P1572: ASCD Brake Switch >> Diagnostic Procedure >> M/T Models

M/T Models

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  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 and/or clutch pedal: Slightly depressed OFF
    Brake pedal and clutch pedal: Fully released ON
    Fig 1: BRAKE SW1 Display In DATA MONITOR Mode With CONSULT-II - M/T
    G02334075Courtesy 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 and/or clutch pedal: Slightly depressed Approximately 0V
    Brake pedal and clutch pedal: Fully released Battery voltage
    Fig 2: Checking Voltage Between ECM Terminal 108 & Ground - M/T
    G02334076Courtesy 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 

    Check "BRAKE SW2" indication in "DATA MONITOR" mode.

    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 - M/T
    G02334077Courtesy 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

    OK or NG 

    1. OK: GO TO  16.
    2. NG: GO TO  11.
    Fig 4: Checking Voltage Between ECM Terminal 101 & Ground - M/T
    G02334078Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK ASCD BRAKE SWITCH CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ASCD clutch switch harness connector.
    3. Turn ignition switch ON.
      Fig 5: Locating ASCD Clutch Switch - M/T
      G02334079Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between ASCD clutch switch terminal 1 and ground under the following conditions with CONSULT-II or tester.
    ASCD CLUTCH SWITCH TERMINAL VOLTAGE

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

    OK or NG 

    1. OK: GO TO  8.
    2. NG: GO TO  4.
    Fig 6: Checking Voltage Between ASCD Clutch Switch Terminal 1 & Ground - M/T
    G02334080Courtesy of NISSAN MOTOR CO., U.S.A.
  4. 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 7: Locating ASCD Brake Switch
      G02334081Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between ASCD brake switch terminal 1 and ground with CONSULT-II or tester.
      1. Voltage: Battery voltage 

    OK or NG 

    1. OK: GO TO  6.
    2. NG: GO TO  5.
    Fig 8: Checking ASCD Brake Switch Power Supply Circuit
    G02334082Courtesy of NISSAN MOTOR CO., U.S.A.
  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Fuse block (J/B) connector E 101
    • 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.
  6. CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Check harness continuity between ASCD brake switch terminal 2 and ASCD clutch switch terminal 1. 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  7.
    2. NG: 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  16.
    2. NG: Replace ASCD brake switch.
  8. CHECK ASCD CLUTCH SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between ASCD clutch switch terminal 2 and ECM terminal 108. 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  10.
    2. NG: GO TO  9.
  9. DETECT MALFUNCTIONING PART 

    Check the following.

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

    Refer to Component Inspection .

    OK or NG 

    1. OK: GO TO  16.
    2. NG: Replace ASCD clutch switch.
  11. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect stop lamp switch harness connector.
      Fig 9: Locating Stop Lamp Switch
      G02334083Courtesy 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 

    OK or NG 

    1. OK: GO TO  13.
    2. NG: GO TO  12.
    Fig 10: Checking Stop Lamp Switch Power Supply Circuit
    G02334084Courtesy of NISSAN MOTOR CO., U.S.A.
  12. 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.
  13. 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  15.
    2. NG: GO TO  14.
  14. 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.
  15. CHECK STOP LAMP SWITCH 

    Refer to Component Inspection .

    OK or NG 

    1. OK: GO TO  16.
    2. NG: Replace stop lamp switch.
  16. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT .

    1. INSPECTION END 
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