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Home >> Infiniti >> 2005 >> FX45 >> Repair and Diagnosis >> Engine Performance >> Engine Control System - VK45DE >> ASD Brake Switch >> Diagnostic Procedure

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.
    DIAGNOSTIC PROCEDURE

    CONDITION INDICATION
    When brake pedal: Slightly depressed OFF
    When brake pedal: Fully released ON
    Fig 1: Data Monitor Screen (1 Of 2)
    G02358936Courtesy 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.
    VOLTAGE SPECIFICATIONS

    CONDITION VOLTAGE
    When brake pedal: Slightly depressed Approximately 0V
    When brake pedal: Fully released Battery voltage
    Fig 2: Data Monitor Screen (2 Of 2)
    G02358937Courtesy 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.

    DATA MONITOR

    CONDITION INDICATION
    When brake pedal: Fully released OFF
    When brake pedal: Slightly depressed ON
    Fig 3: Data Monitor Screen
    G02358938Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

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

    VOLTAGE SPECIFICATIONS

    CONDITION VOLTAGE
    When brake pedal: Fully released Approximately 0V
    When brake pedal: Slightly depressed Battery voltage
    Fig 4: Checking Voltage Between ECM Terminal 101 And Ground
    G02358939Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK: INSPECTION END 
    2. NG: GO TO  8 .
  3. CHECK ASD BRAKE SWITCH POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect ASD brake switch harness connector.
    3. Turn ignition switch ON.
      Fig 5: Disconnecting ASD Brake Switch Harness Connector
      G02358940Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between ASD 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 ASD Brake Switch Terminal 1 And Ground
    G02358941Courtesy 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 ASD brake switch and fuse
      1. : Repair open circuit or short to ground or short to power in harness or connectors.
  5. CHECK ASD 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 ASD brake switch terminal 2. Refer to WIRING DIAGRAM  .
      1. Continuity should exist. 
    4. Also check harness for short to ground or 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 ASD brake switch
      1. : Repair open circuit or short to ground or short to power in harness or connectors.
  7. CHECK ASD BRAKE SWITCH 

    Refer to "COMPONENT INSPECTION  "

    OK or NG

    1. OK: GO TO  13 .
    2. NG: Replace ASD 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
      G02358942Courtesy 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
    G02358943Courtesy 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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