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Home >> Nissan-Datsun >> 2002 >> Sentra SE-R, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 579 (Engine Control System - Coupe) >> ASCD Brake Switch >> Diagnostic Procedure >> A/T Models
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A/T Models

WARNING: This page is about a different car, the 2005 Infiniti G35. However, it is still accessible from the selected car via links, so may be relevant.
  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.
      BRAKE SW1 CONDITION - INDICATION

      CONDITION INDICATION
      Brake pedal: Slightly depressed OFF
      Brake pedal: Fully released ON
      Fig 1: CONSULT-II Display - BRAKE SW1
      G02334213Courtesy 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 PEDAL CONDITION - VOLTAGE

      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
    Fig 2: Checking Voltage Between ECM Terminal 108 & Ground
    G02334214Courtesy of NISSAN MOTOR CO., U.S.A.
  2. CHECK OVERALL FUNCTION-II 

    With CONSULT-II 

    1. Select "BRAKE SW2" in "DATA MONITOR" mode with CONSULT-II.
    2. Check "BRAKE SW2" indication under the following conditions.
      BRAKE SW2 CONDITION - INDICATION

      CONDITION INDICATION
      Brake pedal: Slightly depressed OFF
      Brake pedal: Fully released ON
      Fig 3: CONSULT-II Display - BRAKE SW2
      G02334215Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

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

    BRAKE PEDAL CONDITION - VOLTAGE

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

    OK or NG 

    1. OK: INSPECTION END 
    2. NG: GO TO  8
    Fig 4: Checking Voltage Between ECM Terminal 101 & Ground
    G02334216Courtesy of NISSAN MOTOR CO., U.S.A.
  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: Locating ASCD Brake Switch Harness Connector
      G02334217Courtesy 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 ASCD Brake Switch Power Supply Circuit
    G02334218Courtesy 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
      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 

    1. OK: GO TO  7
    2. 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 

    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: Locating Stop Lamp Switch Harness Connector
      G02334219Courtesy 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  10.
    2. NG: GO TO  9.
    Fig 8: Checking Stop Lamp Switch Power Supply Circuit
    G02334220Courtesy 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
      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 

    1. OK: GO TO  12.
    2. 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 

    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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