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Home >> Infiniti >> 2004 >> QX56 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1208 (Transfer Case) >> Trouble Diagnosis For System >> Actuator Motor >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK ACTUATOR MOTOR SIGNAL 

    With CONSULT-II 

    1. Start engine.
    2. Select "DATA MONITOR" mode for "ALL MODE AWD/4WD" with CONSULT-II.
    3. Read out the value of "SHIFT ACT1""SHIFT AC MON1""SHIFT ACT2" and "SHIFT AC MON2".
      Fig 1: Checking Actuator Motor Signal
      G02383016Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 2: Identifying Data Monitor Screen
      G02383017Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Start engine.
    2. Check voltage between transfer control unit harness connector terminal and ground.
      Fig 3: Transfer Control Unit Harness Connector Terminals And Ground Voltage Specifications
      G02383018Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 4: Checking Voltage Between Transfer Control Unit Harness Connector Terminals And Ground
      G02383019Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 5: Transfer Control Unit Harness Connector Terminals And Ground Voltage Specifications
      G02383020Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 7.
    2. NG: GO TO 2.
  2. CHECK ACTUATOR MOTOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Remove transfer shift high relay and transfer shift low relay.
    3. Check voltage between transfer shift high relay harness connector E46 terminal 5 (R), transfer shift low relay harness connector E47 terminal 5 (R) and ground.
      Fig 6: Transfer Shift High Relay Harness Connector Terminals And Ground Voltage Specifications
      G02383021Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 7: Checking Voltage Between Transfer Shift High Relay Harness Connector E46 Terminal 5, Transfer Shift Low Relay Harness Connector E47 Terminal 5 And Ground
      G02383022Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Turn ignition switch "ON". (Do not start engine.)
    5. Check voltage between transfer shift high relay harness connector E46 terminal 5 (R), transfer shift low relay harness connector E47 terminal 5 (R) and ground.
      Fig 8: Transfer Shift High Relay Harness Connector Terminals And Ground Voltage Specifications
      G02383023Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 9: Checking Voltage Between Transfer Shift High Relay Harness Connector E46 Terminal 5, Transfer Shift Low Relay Harness Connector E47 Terminal 5 And Ground
      G02383024Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Check the following. If any items are damaged, repair or replace damaged parts.
      • 20A fuse [No. 57, located in the fuse block (J/B)]. Refer to "POWER SUPPLY ROUTING CIRCUIT ".
      • Harness for short or open between battery, transfer shift high relay harness connector terminal 5 and transfer shift low relay harness connector terminal 5.
  3. CHECK ACTUATOR MOTOR GROUND CIRCUIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Remove transfer shift high relay and transfer shift low relay. Refer to "LOCATION OF ELECTRICAL PARTS ".
    3. Check continuity between transfer shift high relay harness connector E46 terminals 1 (B/W), 4 (B), transfer shift low relay harness connector E47 terminal 1 (B/W), 4 (B) and ground.
      1. Continuity should exist. 

      Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
    Fig 10: Checking Continuity Between Transfer Shift High Relay Harness Connector E46 Terminals 1, 4 And Transfer Shift Low Relay Harness Connector E47 Terminal 1, 4 And Ground
    G02383025Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK TRANSFER SHIFT RELAY 
    1. Turn ignition switch "OFF".
    2. Remove transfer shift high relay and transfer shift low relay. Refer to "LOCATION OF ELECTRICAL PARTS ".
    3. Apply 12V direct current between transfer shift relay terminals 1 and 2.
    4. Check continuity between relay terminals 3 and 4, 3 and 5.
      Fig 11: Transfer Shift Relay Terminals 3, 4 And 3, 5 Continuity Specifications
      G02383026Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 5.
    2. NG: Replace the transfer shut off relay.
    Fig 12: Checking Continuity Between Relay Terminals 3 And 4, 3 And 5
    G02383027Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND TRANSFER SHIFT RELAY 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connector and the transfer control device (actuator motor) harness connector.
    3. Remove transfer shift high relay and transfer shift low relay.
    4. Check continuity between the following terminals.
      • Transfer control unit harness connector E143 terminal 33 (R/L) and transfer control device (actuator motor) harness connector F58 terminal 21 (R/L).
      • Transfer control unit harness connector E143 terminal 42 (P/G) and transfer control device (actuator motor) harness connector F58 terminal 24 (P/G).
        Fig 13: Checking Continuity Between Transfer Control Unit Harness Connector Terminals And Transfer Control Device (Actuator Motor) Connector Terminals
        G02383028Courtesy of NISSAN MOTOR CO., U.S.A.
      • Transfer control unit harness connector E142 terminal 4 (Y/L) and transfer shift high relay harness connector E46 terminal 2 (Y/L).
      • Transfer control unit harness connector E142 terminal 13 (G/B) and transfer shift low relay harness connector E47 terminal 2 (G/B).
        Fig 14: Checking Continuity Between Transfer Control Unit Harness Connector, Transfer Shift High Relay Harness Connector And Transfer Shift Low Relay Harness Connector Terminals
        G02383029Courtesy of NISSAN MOTOR CO., U.S.A.
      • Transfer control unit harness connector E143 terminal 33 (R/L) and transfer shift high relay harness connector E46 terminal 3 (R/L).
      • Transfer control unit harness connector E143 terminal 42 (P/G) and transfer shift low relay harness connector E47 terminal 3 (P/G).
      1. Continuity should exist. 

      Also check harness for short to ground and short to power.

    OK or NG 

    1. OK: GO TO 6.
    2. NG: Repair or replace damaged parts.
    Fig 15: Checking Continuity Between Transfer Control Unit Harness Connector, Transfer Shift High Relay Harness Connector And Transfer Shift Low Relay Harness Connector Terminals
    G02383030Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK ACTUATOR MOTOR 
    1. Remove transfer control device. Refer to "REMOVAL AND INSTALLATION ".
    2. Check operation by applying battery voltage to transfer control device (actuator motor) terminals 21 and 24.
      CAUTION:
      • Do not operate actuator motor for more than 1 second.
      • Change the actuator motor position to "HIGH" when installing.
      • Be careful not to overheat the harness.
      DIAGNOSTIC PROCEDURE - TERMINAL & ACTUATOR MOTOR

      Terminal Actuator motor
      21 (Battery voltage) - 24 (Ground) Clockwise rotate
      24 (Battery voltage) - 21 (Ground) Counterclockwise rotate
      Fig 16: Applying Battery Voltage To Transfer Control Device (Actuator Motor) Terminals 21 And 24
      G02383031Courtesy of NISSAN MOTOR CO., U.S.A.
    3. Check continuity between transfer control device (actuator motor) terminals 21 and 24.
      1. 21 - 24: Approx. 0.2 Ω 

    OK or NG 

    1. OK: GO TO 7.
    2. NG: Replace transfer control device (actuator motor). Refer to "REMOVAL AND INSTALLATION ".
    Fig 17: Checking Continuity Between Transfer Control Device (Actuator Motor) Terminals 21 And 24
    G02383032Courtesy of NISSAN MOTOR CO., U.S.A.
  7. CHECK TRANSFER CONTROL UNIT 

    Check transfer control unit input/output signal. Refer to "TRANSFER CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES ".

    OK or NG 

    1. OK: GO TO 8.
    2. NG: Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
  8. CHECK DTC 

    Perform the self-diagnosis, after driving a vehicle for a while.

    OK or NG 

    1. OK: Inspection End.
    2. NG: Replace transfer control unit. Refer to "REMOVAL AND INSTALLATION ".
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