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Home >> Nissan-Datsun >> 2011 >> Maxima S >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P1225 Through P2A03 >> DTC P1572: ASCD Brake Switch >> Diagnosis Procedure

Diagnosis Procedure

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM-ENGINE CONTROL SYSTEM- ".

  1. CHECK OVERALL FUNCTION-I

    With CONSULT-III 

    1. Turn ignition switch ON.
    2. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT-III.
    3. Check "BRAKE SW1" indication under the following conditions.
      DATA MONITOR CHART

      Monitor item Condition Indication
      BRAKE SW1 Brake pedal Slightly depressed OFF
      Fully released ON

    Without CONSULT-III 

    1. Turn ignition switch ON.
    2. Check the voltage between ECM harness connectors.
      VOLTAGE REFERENCE CHART

      ECM Condition Voltage
      Connector + -
      Terminal Terminal
      E10 110 (ASCD brake switch signal) 112 Brake pedal Slightly depressed Approx. 0 V
      Fully released Battery voltage
      Fig 1: Checking Voltage Between ECM Harness Connectors
      G05868737Courtesy of NISSAN MOTOR CO., U.S.A.

      Is the inspection result normal? 

      YES >> GO TO 2.

      NO >> GO TO  3.

  2. CHECK OVERALL FUNCTION-II

    With CONSULT-III 

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

    DATA MONITOR CHART

    Monitor item Condition Indication
    BRAKE SW2 Brake pedal Slightly depressed ON
    Fully released OFF

    Without CONSULT-III 

    Check the voltage between ECM harness connectors.

    VOLTAGE REFERENCE CHART

    ECM Condition Voltage
    Connector + -
    Terminal Terminal
    E10 106 (Stop lamp switch signal) 112 Brake pedal Slightly depressed Battery voltage
    Fully released Approx. 0 V
    Fig 2: Checking Voltage Between ECM Harness Connectors
    G05869928Courtesy of NISSAN MOTOR CO., U.S.A.

    Is the inspection result normal? 

    YES >> GO TO  13.

    NO >> 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 the voltage between ASCD brake switch harness connector and ground.
      VOLTAGE REFERENCE CHART

      ASCD brake switch Ground Voltage
      Connector Terminal
      E37 1 Ground Battery voltage
      Fig 3: Checking Voltage Between ASCD Switch Terminal 1 And Ground
      G04875403Courtesy of NISSAN MOTOR CO., U.S.A.

      Is the inspection result normal? 

      YES >> GO TO  5.

      NO >> GO TO 4.

  4. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E6
    • Junction block harness connectors E44, E46
    • 10 A fuse (No. 3)
    • Harness for open or short between ASCD brake switch and fuse

      Repair open circuit, 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 the continuity between ASCD brake switch harness connector and ECM harness connector.
      CONTINUITY CHART

      ASCD brake switch ECM Continuity
      Connector Terminal Connector Terminal
      E37 2 E10 110 Existed
    4. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES >> GO TO  7.

      NO >> GO TO 6.

  6. DETECT MALFUNCTIONING PART

    Check the following.

    • Junction block connectors E45, E46
    • Harness for open or short between ASCD brake switch and ECM

      Repair open circuit, short to ground or short to power in harness or connectors.

  7. CHECK ASCD BRAKE SWITCH

    Refer to "COMPONENT INSPECTION (ASCD BRAKE SWITCH) "

    Is the inspection result normal? 

    YES >> GO TO  13.

    NO >> Replace ASCD brake switch. Refer to REMOVAL AND INSTALLATION .

  8. CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect stop lamp switch harness connector.
    3. Check the voltage between stop lamp switch harness connector and ground.
      VOLTAGE REFERENCE CHART

      Stop lamp switch Ground Voltage
      Connector Terminal
      E38 3 Ground Battery voltage
      Fig 4: Checking Voltage Between Stop Lamp Switch Terminals 3 And Ground
      G04920627Courtesy of NISSAN MOTOR CO., U.S.A.

      Is the inspection result normal? 

      YES >> GO TO  10.

      NO >> GO TO 9.

  9. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E6
    • 10 A fuse (No. 7)
    • Harness for open or short between stop lamp switch and battery

      Repair open circuit, 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 the continuity between stop lamp switch harness connector and ECM harness connector.
      CONTINUITY CHART

      Stop lamp switch ECM Continuity
      Connector Terminal Connector Terminal
      E38 4 E10 106 Existed
    3. Also check harness for short to ground and short to power.

      Is the inspection result normal? 

      YES >> GO TO  12.

      NO >> GO TO 11.

  11. DETECT MALFUNCTIONING PART

    Check the following.

    • Fuse block (J/B) connector E6
    • Junction block connectors E44, E45
    • Harness for open or short between stop lamp switch and ECM

      Repair open circuit, short to ground or short to power in harness or connectors.

  12. CHECK STOP LAMP SWITCH

    Refer to "COMPONENT INSPECTION (STOP LAMP SWITCH) "

    Is the inspection result normal? 

    YES >> GO TO 13.

    NO >> Replace stop lamp switch. Refer to "EXPLODED VIEW ".

  13. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END

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