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Home >> Infiniti >> 2003 >> G35 4D Sedan, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> ASCD Brake Switch >> Diagnostic Procedure >> A/T Models
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A/T Models

  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: "BRAKE SW1" Indication Table
      G00720467Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 2: CONSULT-II Data Monitor Display
      G00720468Courtesy of NISSAN MOTOR CO., U.S.A.

    With CONSULT-II 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 108 and ground under the following conditions.
      Fig 3: ECM Terminal 108 And Ground Voltage Table
      G00720469Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 4: Checking Voltage Between ECM Terminal 108 And Ground
      G00720470Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    OK: GO TO 2.

    NG: GO TO  3 .

  2. CHECK OVERALL FUNCTION-II 

    With CONSULT-II 

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

    Fig 5: "BRAKE SW2" Indication Table
    G00720471Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 6: CONSULT-II Data Monitor Display
    G00720472Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

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

    Fig 7: ECM Terminal 101 And Ground Voltage Table
    G00720473Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 8: Checking Voltage Between ECM Terminal 101 And Ground
    G00720474Courtesy 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 9: Disconnecting ASCD Brake Switch Harness Connector
      G00720475Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Check voltage between ASCD brake switch terminal 1 and ground under the following conditions with CONSULT-II or tester.
      Fig 10: ASCD Brake Switch Terminal 1 And Ground Voltage Table
      G00720476Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 11: Checking Voltage Between ASCD Brake Switch Terminal 1 And Ground
      G00720477Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    OK: GO TO  5 .

    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

    OK: GO TO  7 .

    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

    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 12: Disconnecting Stop Lamp Switch Harness Connector
      G00720478Courtesy 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

    OK: GO TO  10 .

    NG: GO TO 9.

    Fig 13: Checking Voltage Between Stop Lamp Switch Terminal 3 And Ground
    G00720479Courtesy 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 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 4. Refer to Wiring Diagram.
      1. 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 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

    OK: GO TO 13.

    NG: Replace stop lamp switch.

  13. CHECK INTERMITTENT INCIDENT 

    Refer to INTERMITTENTS .

    1. INSPECTION END 
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