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Home >> Infiniti >> 2015 >> Q50 Base, RWD >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Brake Control System (VDC - Diagnostic Trouble Codes (DTCS) Symptom Tests And Component R&R) (Exc Hybrid) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure >> Diagnostic Test

Diagnostic Test

  1. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) IGNITION POWER SUPPLY (1)

    1. Turn the ignition switch OFF.
    2. Disconnect ABS actuator and electric unit (control unit) harness connector.
    3. Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.
      ABS actuator and electric unit (control unit) - Voltage
      Connector Terminal
          Ground Approx. V
    4. Turn the ignition switch ON
      CAUTION:

      Start the engine.

    5. Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.
      ABS actuator and electric unit (control unit) - Voltage
      Connector Terminal
          Ground - V

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    GO TO STEP 2  .

  2. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) IGNITION POWER SUPPLY CIRCUIT

    1. Turn the ignition switch OFF.
    2. Check the A fuse (#).
    3. Disconnect IPDM E/R harness connector.
    4. Check the continuity between ABS actuator and electric unit (control unit) harness connector and fuse block (J/B).
      ABS actuator and electric unit (control unit) IPDM E/R Continuity
      Connector Terminal Connector Terminal
              Existed
    5. Check the continuity between ABS actuator and electric unit (control unit) harness connector and ground.
      ABS actuator and electric unit (control unit) - Continuity
      Connector Terminal
          Ground No existed

    Is the inspection result normal?

    YES 

    Perform trouble diagnosis for ignition power supply.

    NO 

    Repair / replace harness, connector, terminal, or fuse.

  3. CHECK MOTOR AND MOTOR RELAY POWER SUPPLY

    1. Turn the ignition switch OFF.
    2. Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.
      ABS actuator and electric unit (control unit) - Voltage
      Connector Terminal
          Ground - V
    3. Turn the ignition switch ON.
      CAUTION:

      Start the engine.

    4. Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.
      ABS actuator and electric unit (control unit) - Voltage
      Connector Terminal
          Ground - V

    Is the inspection result normal?

    YES 

    GO TO STEP 5  .

    NO 

    GO TO STEP 4  .

  4. CHECK MOTOR AND MOTOR RELAY POWER SUPPLY CIRCUIT

    1. Turn the ignition switch OFF.
    2. Check the A fusible link (#).
    3. Check the continuity and short circuit between ABS actuator and electric unit (control unit) harness connector terminal (→) and A fusible link (#).

    Is the inspection result normal?

    YES 

    Perform trouble diagnosis for battery power supply.

    NO 

    Repair / replace harness, connector, terminal, or fusible link.

  5. CHECK ACTUATOR RELAY, ABS IN VALVE, ABS OUT VALVE POWER SUPPLY

    1. Turn the ignition switch OFF.
    2. Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.
      ABS actuator and electric unit (control unit) - Voltage
      Connector Terminal
          Ground - V
    3. Turn the ignition switch ON
      CAUTION:

      Start the engine.

    4. Check the voltage between ABS actuator and electric unit (control unit) harness connector and ground.
      ABS actuator and electric unit (control unit) - Voltage
      Connector Terminal
          Ground - V

    Is the inspection result normal?

    YES 

    GO TO STEP 7  .

    NO 

    GO TO STEP 6  .

  6. CHECK ACTUATOR RELAY, ABS IN VALVE, ABS OUT VALVE POWER SUPPLY CIRCUIT

    1. Turn the ignition switch OFF.
    2. Check the A fusible link (#).
    3. Check the continuity and short circuit between ABS actuator and electric unit (control unit) harness connector terminal (→) and A fusible link (#).

    Is the inspection result normal?

    YES 

    Perform trouble diagnosis for battery power supply.

    NO 

    Repair / replace harness, connector, terminal, or fusible link.

  7. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) GROUND CIRCUIT

    Check the continuity between ABS actuator and electric unit (control unit) harness connector and the ground.

    ABS actuator and electric unit (control unit) - Continuity
    Connector Terminal
        Ground Existed
     

    Is the inspection result normal?

    YES 

    GO TO STEP 8  .

    NO 

    Repair / replace harness, connector, or terminal.

  8. CHECK TERMINAL

    1. Check the ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with harness connector.
    2. Check the IPDM E/R pin terminals for damage or loose connection with harness connector.

    Is the inspection result normal?

    YES 

    Replace the ABS actuator and electric unit (control unit). Refer to REMOVAL AND INSTALLATION .

    NO 

    Repair / replace harness, connector, or terminal.

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