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Home >> Infiniti >> 2011 >> QX56 RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Transfer Case (ATX90A)) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK TRANSFER CONTROL UNIT POWER SUPPLY (1)
    1. Turn the ignition switch OFF.
    2. Disconnect transfer control unit harness connector.
    3. Check the voltage between transfer control unit harness connector and ground.
      VOLTAGE SPECIFICATION

      Transfer control unit - Voltage
      Connector Terminal
      E59 20 Ground Battery voltage
    4. Turn the ignition switch ON.
      CAUTION: Never start the engine.
    5. Check the voltage between transfer control unit harness connector and ground.
      VOLTAGE SPECIFICATION

      Transfer control unit - Voltage
      Connector Terminal
      E59 20 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  3.

      NO: GO TO 2.

  2. CHECK TRANSFER CONTROL UNIT POWER SUPPLY (2)
    1. Turn the ignition switch OFF.
    2. Check the 10A fuse (#34).
    3. Check the harness for open or short between transfer control unit harness connector No. 0 terminal and 10A (#34).

      Is the inspection result normal? 

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

      NO: Repair or replace error-detected parts.

  3. CHECK TRANSFER CONTROL UNIT POWER SUPPLY (3)
    1. Turn the ignition switch OFF.
    2. Check the voltage between transfer control unit harness connector and ground.
      VOLTAGE SPECIFICATION

      Transfer control unit - Voltage
      Connector Terminal
      E59 32 Ground Approx. 0 V
    3. Turn the ignition switch ON.
      CAUTION: Never start the engine.
    4. Check the voltage between transfer control unit harness connector and ground.
      VOLTAGE SPECIFICATION

      Transfer control unit - Voltage
      Connector Terminal
      E59 32 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  5.

      NO: GO TO 4.

  4. CHECK TRANSFER CONTROL UNIT POWER SUPPLY (4)
    1. Turn the ignition switch OFF.
    2. Check the 10A fuse (#56).
    3. Disconnect IPDM E/R harness connector.
    4. Check the continuity between transfer control unit harness connector and IPDM E/R harness connector.
      CONTINUITY SPECIFICATION

      IPDM E/R Transfer control unit Continuity
      Connector Terminal Connector Terminal
      E15 58 E59 32 Existed
    5. Check the continuity between transfer control unit harness connector and the ground.
      CONTINUITY SPECIFICATION

      Transfer control unit - Continuity
      Connector Terminal
      E59 32 Ground Not existed

      Is the inspection result normal? 

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

      NO: Repair or replace error-detected parts.

  5. CHECK TRANSFER MOTOR POWER SUPPLY
    1. Turn the ignition switch OFF.
    2. Check the voltage between transfer control unit harness connector and ground.
      VOLTAGE SPECIFICATION

      Transfer control unit - Voltage
      Connector Terminal
      E60 41 Ground Battery voltage
    3. Turn the ignition switch ON.
      CAUTION: Never start the engine.
    4. Check the voltage between transfer control unit harness connector and ground.
      VOLTAGE SPECIFICATION

      Transfer control unit - Voltage
      Connector Terminal
      E60 41 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  7.

      NO: GO TO 6.

  6. CHECK TRANSFER MOTOR POWER SUPPLY CIRCUIT
    1. Turn the ignition switch OFF.
    2. Check the 30A fusible link (J).
    3. Check the harness for open or short between transfer control unit harness connector No. 1 terminal and 30A fusible link (J).

      Is the inspection result normal? 

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

      NO: Repair or replace error-detected parts.

  7. CHECK 4WD SWITCH ASSEMBLY POWER SUPPLY (1)
    1. Turn the ignition switch OFF.
    2. Disconnect 4WD switch assembly harness connector.
    3. Check the voltage between 4WD switch assembly harness connector and ground.
      VOLTAGE SPECIFICATION

      4WD switch assembly - Voltage
      Connector Terminal
      M54 12 Ground Approx. 0 V
    4. Turn the ignition switch ON.
      CAUTION: Never start the engine.
    5. Check the voltage between 4WD switch assembly harness connector and ground.
      VOLTAGE SPECIFICATION

      4WD switch assembly - Voltage
      Connector Terminal
      M54 12 Ground Battery voltage

      Is the inspection result normal? 

      YES: GO TO  9.

      NO: GO TO 8.

  8. CHECK 4WD SWITCH ASSEMBLY POWER SUPPLY (2)
    1. Turn the ignition switch OFF.
    2. Check the 10A fuse (#13).
    3. Disconnect fuse block (J/B) harness connector.
    4. Check the continuity between transfer control unit harness connector and IPDM E/R harness connector.
      CONTINUITY SPECIFICATION

      Fuse block (J/B) 4WD switch assembly Continuity
      Connector Terminal Connector Terminal
      M3 10C M54 12 Existed
    5. Check the continuity between transfer control unit harness connector and the ground.
      CONTINUITY SPECIFICATION

      4WD switch assembly - Continuity
      Connector Terminal
      M54 12 Ground Not existed

      Is the inspection result normal? 

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

      NO: Repair or replace error-detected parts.

  9. CHECK TRANSFER CONTROL UNIT GROUND
    1. Turn the ignition switch OFF.
    2. Check the voltage between transfer control unit harness connector and ground.
      VOLTAGE SPECIFICATION

      Transfer control unit - Voltage
      Connector Terminal
      E60 44 Ground Approx. 0 V
      46
    3. Check the continuity between transfer control unit harness connector and ground.
      CONTINUITY SPECIFICATION

      Transfer control unit - Continuity
      Connector Terminal
      E60 44 Ground Existed
      46

      Is the inspection result normal? 

      YES: GO TO 10.

      NO: Repair or replace error-detected parts.

  10. CHECK 4WD SWITCH ASSEMBLY GROUND
    1. Turn the ignition switch OFF.
    2. Check the voltage between transfer control unit harness connector and ground.
      VOLTAGE SPECIFICATION

      4WD switch assembly - Voltage
      Connector Terminal
      M54 20 Ground Approx. 0 V

      Is the inspection result normal? 

      YES: INSPECTION END

      NO: Repair or replace error-detected parts.

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