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Home >> Infiniti >> 2015 >> QX60 Base, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 79 (Brake Control System (DTC/Circuit Diagnosis) (Without ICC) (Except Hybrid)) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> 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 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
      (Approx.)
      Connector Terminal
      E125 28 Ground 0 V
    4. Turn the ignition switch ON
      NOTE:

      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
      (Approx.)
      Connector Terminal
      E125 28 Ground Battery voltage

    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 10A fuse (49).
    3. Disconnect IPDM E/R harness connector.
    4. Check the continuity between ABS actuator and electric unit (control unit) harness connector and IPDM E/R.
      ABS actuator and electric unit (control unit) IPDM E/R Continuity
      Connector Terminal Connector Terminal
      E125 28 E119 35 Yes
    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
      E125 28 Ground No

    Is the inspection result normal?

    YES 

    Perform trouble diagnosis for ignition power supply.

    NO 

    Repair / replace harness, connector, 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
      (Approx.)
      Connector Terminal
      E125 3 Ground Battery voltage
    3. Turn the ignition switch ON.
      NOTE:

      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
      (Approx.)
      Connector Terminal
      E125 3 Ground Battery voltage

    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 50A fusible link (I).
    3. Check the continuity and short circuit between ABS actuator and electric unit (control unit) harness connector terminal 4 and 50A fusible link (I).

    Is the inspection result normal?

    YES 

    Perform trouble diagnosis for battery power supply.

    NO 

    Repair / replace harness, connector, 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
      (Approx.)
      Connector Terminal
      E125 1 Ground Battery voltage
    3. Turn the ignition switch ON
      NOTE:

      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
      (Approx.)
      Connector Terminal
      E125 1 Ground Battery voltage

    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 30A fusible link (J).
    3. Check the continuity and short circuit between ABS actuator and electric unit (control unit) harness connector terminal 3 and 30A fusible link (J).

    Is the inspection result normal?

    YES 

    Perform trouble diagnosis for battery power supply.

    NO 

    Repair / replace harness, connector, 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
    E125 4 Ground Yes
    2

    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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