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Home >> Infiniti >> 2011 >> QX56 RWD >> Repair and Diagnosis >> Brakes >> Traction Control >> Brake Control System (With VDC) >> [With VDC] >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure

Diagnosis Procedure

  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 voltage between ABS actuator and electric unit (control unit) harness connector and ground.
      VOLTAGE SPECIFICATION

      ABS actuator and electric unit (control unit) - Voltage
      Connector Terminal
      E36 18 Ground Approx. 0 V
    4. Turn the ignition switch ON
      CAUTION: Never start engine.
    5. Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.
      VOLTAGE SPECIFICATION

      ABS actuator and electric unit (control unit) - Voltage
      Connector Terminal
      E36 18 Ground 10 - 16 V

      Is the inspection result normal? 

      YES: GO TO  3.

      NO: GO TO 2.

  2. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) IGNITION POWER SUPPLY CIRCUIT (1)
    1. Turn the ignition switch OFF.
    2. Check 10A fuse (#57).
    3. Disconnect IPDM E/R harness connector.
    4. Check continuity between ABS actuator and electric unit (control unit) harness connector and IPDM E/R harness connector.
      CONTINUITY SPECIFICATION

      ABS actuator and electric unit (control unit) IPDM E/R Continuity
      Connector Terminal Connector Terminal
      E36 18 E15 59 Existed
    5. Check for continuity between ABS actuator and electric unit (control unit) harness connector and the ground.
      CONTINUITY SPECIFICATION

      ABS actuator and electric unit (control unit) - Continuity
      Connector Terminal
      E36 18 Ground Not existed

      Is the inspection result normal? 

      YES: Perform trouble diagnosis for ignition power supply. Refer to "WIRING DIAGRAM - IGNITION POWER SUPPLY - ".

      NO: Repair or replace error-detected parts.

  3. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) IGNITION POWER SUPPLY (2)
    1. Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.
      VOLTAGE SPECIFICATION

      ABS actuator and electric unit (control unit) - Voltage
      Connector Terminal
      E37 49 Ground Approx. 0 V
    2. Turn the ignition switch ON
      CAUTION: Never start engine.
    3. Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.
      VOLTAGE SPECIFICATION

      ABS actuator and electric unit (control unit) - Voltage
      Connector Terminal
      E37 49 Ground 10 - 16 V

      Is the inspection result normal? 

      YES: GO TO  5.

      NO: GO TO 4.

  4. CHECK ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) IGNITION POWER SUPPLY CIRCUIT (2)
    1. Turn the ignition switch OFF.
    2. Check 10A fuse (#74).
    3. Check continuity and short circuit between ABS actuator and electric unit (control unit) harness connector terminal (49) and 10A fuse (#74).

      Is the inspection result normal? 

      YES: Perform trouble diagnosis for ignition power supply. Refer to "WIRING DIAGRAM - IGNITION POWER SUPPLY - ".

      NO: Repair or replace error-detected parts.

  5. CHECK MOTOR AND MOTOR RELAY POWER SUPPLY CIRCUIT
    1. Turn the ignition switch OFF.
    2. Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.
      VOLTAGE SPECIFICATION

      ABS actuator and electric unit (control unit) - Voltage
      Connector Terminal
      E36 4 Ground Battery voltage
      E37 47
    3. Turn the ignition switch ON.
      CAUTION: Never start engine.
    4. Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.
      VOLTAGE SPECIFICATION

      ABS actuator and electric unit (control unit) - Voltage
      Connector Terminal
      E36 4 Ground Battery voltage
      E37 47

      Is the inspection result normal? 

      YES: GO TO  7.

      NO: GO TO 6.

  6. CHECK MOTOR AND MOTOR RELAY POWER SUPPLY CIRCUIT
    1. Turn the ignition switch OFF.
    2. Check 50A fusible link (M).
    3. Check continuity and short circuit between ABS actuator and electric unit (control unit) harness connector terminal (4 and 47) and 50A fusible link (M).

      Is the inspection result normal? 

      YES: Perform trouble diagnosis for battery power supply. Refer to "WIRING DIAGRAM - BATTERY POWER SUPPLY - ".

      NO: Repair or replace error-detected parts.

  7. CHECK ACTUATOR RELAY, ABS IN VALVE, ABS OUT VALVE, ANS CUT VALVE, SUCTION VALVE POWER SUPPLY
    1. Turn the ignition switch OFF.
    2. Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.
      VOLTAGE SPECIFICATION

      ABS actuator and electric unit (control unit) - Voltage
      Connector Terminal
      E36 1 Ground Battery voltage
    3. Turn the ignition switch ON
      CAUTION: Never start engine.
    4. Check voltage between ABS actuator and electric unit (control unit) harness connector and ground.
      VOLTAGE SPECIFICATION

      ABS actuator and electric unit (control unit) - Voltage
      Connector Terminal
      E36 1 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  9.

      NO: GO TO 8.

  8. CHECK ACTUATOR RELAY, ABS IN VALVE, ABS OUT VALVE, ANS CUT VALVE, SUCTION VALVE POWER SUPPLY CIRCUIT
    1. Turn the ignition switch OFF.
    2. Check 30A fusible link (L).
    3. Check continuity and short circuit between ABS actuator and electric unit (control unit) harness connector terminal (1) and 30A fusible link (L).

      Is the inspection result normal? 

      YES: Perform trouble diagnosis for battery power supply. Refer to "WIRING DIAGRAM - BATTERY POWER SUPPLY - ".

      NO: Repair or replace error-detected parts.

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

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

    CONTINUITY SPECIFICATION

    ABS actuator and electric unit (control unit) - Continuity
    Connector Terminal
    E36 2 Ground Existed
    3
    E37 48

    Is the inspection result normal? 

    YES: GO TO 10.

    NO: Repair or replace error-detected parts.

  10. CHECK TERMINAL
    • Check ABS actuator and electric unit (control unit) pin terminals for damage or loose connection with harness connector.
    • Check IPDM E/R pin terminals for damage or loose connection with harness connector.

      Is the inspection result normal? 

      YES: INSPECTION END

      NO: Repair or replace error-detected parts.

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