2005 Nissan-Datsun Sentra Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Overall Function Check

Use this procedure to check the overall function of the ASCD brake switch circuit. During this check, a 1st trip DTC might not be confirmed.

WITHOUT CONSULT-II 

  1. Turn ignition switch ON.
  2. Check voltage between ECM terminal 108 (ASCD brake switch signal) and ground under the following conditions.
    Fig 1: Checking Voltage Between ECM Connector Terminal 108 & Ground
    G02450411Courtesy of NISSAN MOTOR CO., U.S.A.

    A/T models 

    ASCD BRAKE SWITCH CIRCUIT TEST CONDITIONS - A/T MODELS

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

    M/T models 

    ASCD BRAKE SWITCH CIRCUIT TEST CONDITIONS - M/T MODELS

    CONDITION VOLTAGE
    Clutch pedal and/or brake pedal: Slightly depressed Approximately 0V
    Clutch pedal and brake pedal: Fully released Battery voltage
  3. If NG, go to "DIAGNOSTIC PROCEDURE ".

    If OK, go to next step.

  4. Check voltage between ECM terminal 101 (Stop lamp switch signal) and ground under the following conditions.
    Fig 2: Checking Voltage Between ECM Connector Terminal 101 & Ground
    G02450412Courtesy of NISSAN MOTOR CO., U.S.A.
    ASCD BRAKE SWITCH VOLTAGE TEST CONDITIONS

    CONDITION VOLTAGE
    Brake pedal: Fully released Approximately 0V
    Brake pedal: Slightly depressed Battery voltage
  5. If NG, go to "DIAGNOSTIC PROCEDURE ".
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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