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Home >> Nissan-Datsun >> 2005 >> Murano SL, AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> ASCD Brake Switch >> Diagnostic Procedure
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Diagnostic Procedure

  1. CHECK OVERALL FUNCTION-I 

    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.
    Fig 1: CONSULT-II Data Monitor Screen
    G02466907Courtesy of NISSAN MOTOR CO., U.S.A.
    INDICATION REFERENCE

    CONDITION INDICATION
    When brake pedal is depressed OFF
    When brake pedal is fully released ON

    Without CONSULT-II 

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

    CONDITION VOLTAGE
    When brake pedal is depressed Approximately 0V
    When brake pedal is fully released Battery voltage

    OK or NG 

    • OK: GO TO 2.
    • NG: GO TO  3.
    Fig 2: Checking Voltage Between ECM Terminal 108 And Ground
    G02466908Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK OVERALL FUNCTION-II 

    With CONSULT-II 

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

    INDICATION REFERENCE

    CONDITION INDICATION
    When brake pedal is released OFF
    When brake pedal is depressed ON
    Fig 3: CONSULT-II Data Monitor Screen
    G02466909Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

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

    VOLTAGE REFERENCE

    CONDITION VOLTAGE
    When brake pedal is released Approximately 0V
    When brake pedal is depressed Battery voltage
    Fig 4: Checking Voltage Between ECM Terminal 101 And Ground
    G02466910Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: INSPECTION END 
    • 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: Disconnecting ASCD Brake Switch Harness Connector
      G02466911Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between ASCD brake switch terminal 1 and ground with CONSULT-II or tester.
      • Voltage: Battery voltage 

    OK or NG 

    • OK: GO TO  5.
    • NG: GO TO 4.
    Fig 6: Checking Voltage Between ASCD Brake Switch Terminal 1 And Ground
    G02466912Courtesy of NISSAN MOTOR CO., U.S.A.
  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
    • 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 .
      • Continuity should exist  .
    4. Also check harness for short to ground and short to power.

    OK or NG 

    • OK: GO TO  7.
    • NG: GO TO 6.
  6. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E109, M6
    • Harness for open or short between ECM and ASCD brake switch
    • 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 

    • OK: GO TO  13.
    • 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: Disconnecting Stop Lamp Switch Harness Connector
      G02466913Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between stop lamp switch terminal 1 and ground with CONSULT -II or tester.
      • Voltage: Battery voltage 

    OK or NG 

    • OK: GO TO  10.
    • NG: GO TO 9.
    Fig 8: Checking Voltage Between Stop Lamp Switch Terminal 1 And Ground
    G02466914Courtesy of NISSAN MOTOR CO., U.S.A.
  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
    • 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 2. Refer to WIRING DIAGRAM .
      • Continuity should exist. 
    3. Also check harness for short to ground and short to power.

    OK or NG 

    • OK: GO TO  12.
    • NG: GO TO 11.
  11. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E110, M7
    • 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.
  12. CHECK STOP LAMP SWITCH 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

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

    Refer to "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT ".

    • INSPECTION END 
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