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Home >> Infiniti >> 2015 >> QX60 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 116 (Engine Control System (DTC/Circuit Diagnosis) (VQ35DE) (Except Hybrid) (3 Of 3)) >> DTC/Circuit Diagnosis >> DTC P1572: ASCD Brake Switch >> Diagnosis Procedure >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2016 Infiniti QX60. However, it is still accessible from the selected car via links, so may be relevant.

  1. CHECK OVERALL FUNCTION-I

    G-20With CONSULT 

    1. Turn ignition switch ON.
    2. Select "BRAKE SW1" in "DATA MONITOR" mode with CONSULT.
    3. Check "BRAKE SW1" indication under the following conditions.
      Monitor item Condition Indication
      BRAKE SW1 Brake pedal Slightly depressed OFF
      Fully released ON

    G-21Without CONSULT 

    1. Turn ignition switch ON.
    2. Check the voltage between ECM harness connectors.
      ECM Condition Voltage
      Connector + -
      Terminal Terminal
      E32 140 152 Brake pedal Slightly depressed Approx. 0 V
      Fully released Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    GO TO STEP 3  .

  2. CHECK OVERALL FUNCTION-II

    G-20With CONSULT 

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

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

    G-21Without CONSULT 

    Check the voltage between ECM harness connectors.

    ECM Condition Voltage
    Connector + -
    Terminal Terminal
    E32 139 152 Brake pedal Slightly depressed Battery voltage
    Fully released Approx. 0 V

    Is the inspection result normal?

    YES 

    Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    NO 

    GO TO STEP 6  .

  3. CHECK BRAKE PEDAL POSITION SWITCH POWER SUPPLY

    1. Turn ignition switch OFF.
    2. Disconnect brake pedal position switch harness connector.
    3. Turn ignition switch ON.
    4. Check the voltage between brake pedal position switch harness connector and ground.
      Brake pedal position switch Ground Voltage
      Connector Terminal
      E76 1 Ground Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    Repair or replace error-detected parts.

  4. CHECK BRAKE PEDAL POSITION SWITCH INPUT SIGNAL CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check the continuity between brake pedal position switch harness connector and ECM harness connector.
      Brake pedal position switch ECM Continuity
      Connector Terminal Connector Terminal
      E76 2 E32 140 Existed
    4. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

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

  5. CHECK BRAKE PEDAL POSITION SWITCH

    Check brake pedal position switch. Refer to COMPONENT INSPECTION (BRAKE PEDAL POSITION SWITCH) .

    Is the inspection result normal?

    YES 

    Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    NO 

    Replace brake pedal position switch. Refer to REMOVAL AND INSTALLATION .

  6. CHECK STOP LAMP SWITCH POWER SUPPLY

    1. Turn ignition switch OFF.
    2. Disconnect stop lamp switch harness connector.
    3. Check the voltage between stop lamp switch harness connector and ground.
      Stop lamp switch Ground Voltage
      Connector Terminal
      E38 1 Ground Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    Perform the trouble diagnosis for power supply circuit.

  7. CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT

    1. Disconnect ECM harness connector.
    2. Check the continuity between stop lamp switch harness connector and ECM harness connector.
      Stop lamp switch ECM Continuity
      Connector Terminal Connector Terminal
      E38 2 E32 139 Existed
    3. Also check harness for short to ground and short to power.

    Is the inspection result normal?

    YES 

    GO TO STEP 8  .

    NO 

    Repair or replace error-detected parts.

  8. CHECK STOP LAMP SWITCH

    Check stop lamp switch. Refer to COMPONENT INSPECTION (STOP LAMP SWITCH) .

    Is the inspection result normal?

    YES 

    Check intermittent incident. Refer to INTERMITTENT INCIDENT .

    NO 

    Replace stop lamp switch. Refer to REMOVAL AND INSTALLATION .

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