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Home >> Infiniti >> 2004 >> QX56 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1208 (Transfer Case) >> Trouble Diagnosis For System >> Transfer 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 TRANSFER MOTOR RELAY 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 "MOTOR RELAY" and "MOTOR RELAY MON".
      Fig 1: Checking Transfer Motor Relay Signal
      G02383090Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 2: Identifying "MOTOR RELAY" And "MOTOR RELAY MON"
      G02383091Courtesy 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 Terminal And Ground Voltage Specifications
      G02383092Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 4: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground
      G02383093Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 7.
    2. NG: GO TO 2.
  2. CHECK TRANSFER MOTOR RELAY POWER SUPPLY CIRCUIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Connect transfer control unit harness connector.
    3. Disconnect transfer motor relay.
    4. Check voltage between transfer motor relay harness connector terminals and ground.
      DIAGNOSTIC PROCEDURE - CONNECTOR & TERMINAL VOLTAGE

      Connector Terminal (Wire color) Voltage (Approx.)
      E153 2 (Y/R) - Ground 0V
      E154 5 (G/R) - Ground Battery voltage
      Fig 5: Checking Voltage Between Transfer Motor Relay Harness Connector Terminals And Ground
      G02383094Courtesy of NISSAN MOTOR CO., U.S.A.
    5. Turn ignition switch "ON". (Do not start engine.)
    6. Check voltage between transfer motor relay harness connector terminals and ground.
      Fig 6: Transfer Motor Relay Harness Connector Terminals And Ground Voltage Specifications
      G02383095Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 7: Checking Voltage Between Transfer Motor Relay Harness Connector Terminals And Ground
      G02383096Courtesy 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. 58 located in the fuse and relay box. Refer to "POWER SUPPLY ROUTING CIRCUIT ".
      • 10A fuse No. 26 located in the fuse and fusible link box. Refer to "POWER SUPPLY ROUTING CIRCUIT "
      • Harness for short or open between battery and transfer motor relay harness connector E154 terminal 5 (G/R).
      • Harness for short or open between transfer shut off relay harness connector E69 terminal 5 (Y/R) and transfer motor relay harness connector E153 terminal 2 (Y/R).
      • Battery and ignition switch. Refer to "POWER SUPPLY ROUTING CIRCUIT ".
  3. CHECK TRANSFER MOTOR RELAY 
    1. Turn ignition switch "OFF".
    2. Remove transfer motor relay. Refer to "LOCATION OF ELECTRICAL PARTS ".
    3. Apply 12V direct current between transfer motor relay terminals 1 and 2.
    4. Check continuity between relay terminals 3 and 5.
      DIAGNOSTIC PROCEDURE - TERMINAL CONDITION & CONTINUITY

      Condition Continuity
      12V direct current supply between terminals 1 and 2 Yes
      OFF No

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Replace the transfer motor relay.
    Fig 8: Applying 12V Direct Current Between Transfer Motor Relay Terminals 1, 2 And Checking Continuity Between Relay Terminals 3 And 5
    G02383097Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK TRANSFER MOTOR CONTROL CIRCUIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Remove transfer motor relay. Refer to "LOCATION OF ELECTRICAL PARTS ".
    3. Disconnect transfer control unit harness connector and transfer motor.
    4. Check continuity between the following terminals.
      • Transfer control unit harness connector E142 terminal 14 (LG) and transfer motor relay harness connector E153 terminal 1 (LG).
        Fig 9: Checking Continuity Between Transfer Control Unit Harness Connector E142 Terminal 14 And Transfer Motor Relay Harness Connector E153 Terminal 1
        G02383098Courtesy of NISSAN MOTOR CO., U.S.A.
      • Transfer control unit harness connector E142 terminal 41 (R) and transfer motor relay harness connector E154 terminal 3 (R).
      • Transfer control unit harness connector E142 terminal 41 (R) and transfer motor harness connector F57 terminal 14 (R).
      1. Continuity should exist. 

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

    OK or NG 

    1. OK: GO TO 5.
    2. NG: Repair or replace damaged parts.
    Fig 10: Checking Continuity Between Transfer Control Unit Harness Connector Terminals And Transfer Motor Relay Harness Connector Terminals
    G02383099Courtesy of NISSAN MOTOR CO., U.S.A.
  5. CHECK TRANSFER MOTOR GROUND CIRCUIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer motor harness connector.
    3. Check continuity between transfer motor harness connector F57 terminal 15 (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 6.
    2. NG: Repair open circuit or short to ground or short to power in harness or connectors.
    Fig 11: Checking Continuity Between Transfer Motor Harness Connector F57 Terminal 15 (B) And Ground
    G02383100Courtesy of NISSAN MOTOR CO., U.S.A.
  6. CHECK TRANSFER MOTOR 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer motor harness connector.
    3. Apply 12V direct current between transfer motor terminals 14 and 15.

    Does transfer motor operate? 

    1. YES: GO TO 7.
    2. NO: Replace transfer motor. Refer to "REMOVAL AND INSTALLATION ".
    Fig 12: Applying 12V Direct Current Between Transfer Motor Terminals 14 And 15
    G02383101Courtesy of NISSAN MOTOR CO., U.S.A.
  7. CHECK TRANSFER CONTROL UNIT 

    Check transfer control unit input/output signal. Refer to "TRANSFER CONTROL UNIT TERMINALS AND REFERENCE VALUE ".

    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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