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Home >> Infiniti >> 2004 >> I35 >> Repair and Diagnosis >> Engine Performance >> System >> 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.
      Fig 1: Displaying CONSULT-II DATA MONITOR Screen
      G00787541Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check the indication of BRAKE SW1 under the following conditions.
      Fig 2: BRAKE SW1 Specifications
      G00787542Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Turn ignition switch ON.
    2. Check voltage between ECM terminal 59 and ground under the following conditions.
    Fig 3: Checking Voltage At ECM
    G00787543Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 4: ECM Voltage Specification
    G00787544Courtesy of NISSAN MOTOR CO., U.S.A.

    Refer to Wiring Diagram.

    OK or NG

    1. OK: GO TO 2.
    2. NG: GO TO  3 .
  2. CHECK OVERALL FUNCTION-II 

    With CONSULT-II 

    See BRAKE SW2 indication in DATA MONITOR mode.

    Fig 5: Displaying CONSULT-II DATA MONITOR Screen
    G00787545Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 6: BRAKE SW2 Specifications
    G00787546Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    Check voltage between ECM terminal 55 and ground under the following conditions.

    Fig 7: Checking Voltage At ECM
    G00787547Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 8: ECM Voltage Specifications
    G00787548Courtesy of NISSAN MOTOR CO., U.S.A.

    Refer to Wiring Diagram.

    OK or NG

    1. OK: GO TO  13 .
    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.
    4. Check voltage between ASCD brake switch terminal 1 and ground with CONSULT-II or tester.
      Fig 9: Checking Voltage At ASCD
      G00787549Courtesy of NISSAN MOTOR CO., U.S.A.

      OK or NG 

      1. OK: GO TO  5 .
      2. NG: GO TO 4.
  4. DETECT MALFUNCTIONING PART 

    Check the following.

    • Fuse block (J/B) connector E83
    • 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 CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between ECM terminal 59 and ASCD brake switch terminal 2.

      Refer to Wiring Diagram.

      Continuity should exist. 

    4. Also check harness for open 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 E81, M15
    • Harness connectors M223, F53
    • Harness for open and 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 8.
    2. NG: Replace ASCD brake switch.
  8. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors E81, M15
    • Harness connectors M223, F53
    • Harness for open and short between ASCD clutch switch and ECM
    1. : Repair open circuit or short to ground or short to power in harness or connectors.
  9. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect stop lamp switch harness connector.
    3. Check voltage between stop lamp switch terminal 1 and ground with CONSULT-II or tester.
    Fig 10: Checking Voltage At Stop Lamp Switch
    G00787550Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO  11 .
    2. NG: GO TO 10.
  10. DETECT MALFUNCTIONING PART 

    Check the following.

    • Fuse block (J/B) connector M17
    • 15A fuse
    • Harness connectors M15, E81
    • Harness for open or short between stop lamp switch and fuse
    • : Repair open circuit or short to ground in harness or connectors.
  11. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 
    1. Disconnect ECM harness connector.
    2. Check harness continuity between stop lamp switch terminal 2 and ECM terminal 55.
      Fig 11: Checking Harness Continuity At Stop Lamp Switch and ECM
      G00787551Courtesy of NISSAN MOTOR CO., U.S.A.

      Continuity should exist 

    3. Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO  13 .
    2. NG: GO TO  14 .
  12. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connectors M15, E81
    • Harness connectors M223, F53
    • Harness for open or short between stop lamp switch and ECM
    1. : Repair open circuit or short to ground or short to power in harness or connectors.
  13. CHECK STOP LAMP SWITCH 

    Refer to COMPONENT INSPECTION  .

    OK or NG 

    1. OK: GO TO 14.
    2. NG: Replace stop lamp switch.
  14. CHECK INTERMITTENT INCIDENT 

    Refer to TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT  .

    1. : INSPECTION END 
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