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Home >> Infiniti >> 2005 >> FX35 AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control System - VQ35DE >> 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: Identifying CONSULT-II Display Screen Data Monitor
      G02361172Courtesy of NISSAN MOTOR CO., U.S.A.
      BRAKE SW1 CONDITION

      CONDITION INDICATION
      Brake pedal: Slightly depressed OFF
      Brake pedal: Fully released ON

    Without CONSULT-II 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 108 and ground under the following conditions.
      Fig 2: Checking Voltage Between ECM Terminal 108 And Ground
      G02361173Courtesy of NISSAN MOTOR CO., U.S.A.
      VOLTAGE BETWEEN TERMINALS CHART

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

    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.

    Fig 3: Identifying CONSULT-II Display Screen Data Monitor
    G02361174Courtesy of NISSAN MOTOR CO., U.S.A.
    BRAKE SW2 CONDITION

    CONDITION INDICATION
    Brake pedal: Fully released OFF
    Brake pedal: Slightly depressed ON

    Without CONSULT-II 

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

    VOLTAGE BETWEEN TERMINALS CHART

    CONDITION VOLTAGE
    Brake pedal: Fully released Approximately 0V
    Brake pedal: Slightly depressed Battery voltage
    Fig 4: Checking Voltage Between ECM Terminal 101 And Ground
    G02361175Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: INSPECTION END 
    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: Disconnecting ASCD Brake Switch Harness Connector
      G02361176Courtesy 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  5 .
    2. NG: GO TO 4.
    Fig 6: Checking Voltage Between ASCD Brake Switch Terminal 1 And Ground
    G02361177Courtesy of NISSAN MOTOR CO., U.S.A.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Fuse block (J/B) connector E201
    • 10A fuse
    • Harness for open or short between ASCD brake switch and fuse
      1. : Repair open circuit or short to ground or short 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 E211, M41
    • Harness for open or short between ECM and ASCD brake switch
      1. : Repair open circuit or short to ground or short 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: Disconnecting Stop Lamp Switch Harness Connector
      G02361178Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check voltage between stop lamp switch terminal 1 and ground with CONSULT -II or tester.
      1. Voltage: Battery voltage 

    OK or NG

    1. OK: GO TO  10 .
    2. NG: GO TO 9.
    Fig 8: Checking Voltage Between Stop Lamp Switch Terminal 1 And Ground
    G02361179Courtesy of NISSAN MOTOR CO., U.S.A.
  9. DETECT MALFUNCTIONING PART 

    Check the following.

    • Fuse block (J/B) connector E201
    • 10A fuse
    • Harness for open or short between stop lamp switch and battery
      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 2. 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 E211, M41
    • 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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