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Home >> Infiniti >> 2004 >> QX56 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1208 (Transfer Case) >> Trouble Diagnosis For System >> 4WD Shift Switch >> 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 4WD SHIFT SWITCH SIGNAL 

    With CONSULT-II 

    1. Turn ignition switch "ON". (Do not start engine.)
    2. Select "DATA MONITOR" mode for "ALL MODE AWD/4WD" with CONSULT-II.
    3. Read out ON/OFF switching action of the "2WD SWITCH""AUTO SWITCH", "LOCK SWITCH""4L SWITCH" with operating 4WD shift switch.
      Fig 1: Identifying Data Monitor Screen
      G02382992Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. Turn ignition switch "ON". (Do not start engine.)
    2. Check voltage between transfer control unit harness connector terminals and ground.
      Fig 2: Transfer Control Unit Harness Connector Terminals And Ground Voltage Specifications
      G02382993Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 3: Checking Voltage Between Transfer Control Unit Harness Connector Terminals And Ground
      G02382994Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 5.
    2. NG: GO TO 2.
  2. CHECK 4WD SHIFT SWITCH POWER SUPPLY CIRCUIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect 4WD shift switch harness connector.
    3. Check voltage between 4WD shift switch harness connector terminal 1 and ground.
      DIAGNOSTIC PROCEDURE - CONNECTOR & TERMINAL VOLTAGE

      Connector Terminal (Wire color) Voltage (Approx.)
      M141 1 (W/R) - Ground 0V
      Fig 4: Checking Voltage Between 4WD Shift Switch Harness Connector Terminal 1 And Ground
      G02382995Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Turn ignition switch "ON". (Do not start engine.)
    5. Check voltage between 4WD shift switch harness connector terminal 1 and ground.
      DIAGNOSTIC PROCEDURE - CONNECTOR & TERMINAL VOLTAGE

      Connector Terminal (Wire color) Voltage (Approx.)
      M141 1 (W/R) - Ground Battery voltage

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Go to "POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT ".
    Fig 5: Checking Voltage Between 4WD Shift Switch Harness Connector Terminal 1 And Ground
    G02382996Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK HARNESS BETWEEN 4WD SHIFT SWITCH AND TRANSFER CONTROL UNIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connector and the 4WD shift switch harness connector.
    3. Check continuity between the following terminals.
      • Transfer control unit harness connector E142 terminal 9 (G/W) and 4WD shift switch harness connector M141 terminal 2 (G/W).
      • Transfer control unit harness connector E142 terminal 18 (O) and 4WD shift switch harness connector M141 terminal 5 (O).
      • Transfer control unit harness connector E142 terminal 23 (R) and 4WD shift switch harness connector M141 terminal 6 (R).
      • Transfer control unit harness connector E142 terminal 24 (LG/R) and 4WD shift switch harness connector M141 terminal 3 (LG/R).
      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: Check the following. If any items are damaged, repair or replace damaged parts.
      • Harness for short or open between battery and transfer shut off relay harness connector E69 terminal 3 (G).
      • Power supply circuit for transfer control unit. Refer to "POWER SUPPLY ROUTING CIRCUIT ".
    Fig 6: Checking Continuity Between Transfer Control Unit Harness Connector Terminals And 4WD Shift Switch Harness Connector Terminals
    G02382997Courtesy of NISSAN MOTOR CO., U.S.A.
  4. CHECK 4WD SHIFT SWITCH 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect 4WD shift switch harness connector.
    3. Operate 4WD shift switch and check continuity between 4WD shift switch terminals.
      Fig 7: 4WD Shift Switch Harness Connector Terminal Continuity Specifications
      G02382998Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 8: Checking Continuity Between 4WD Shift Switch Terminals
      G02382999Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 5.
    2. NG: Replace 4WD shift switch.
  5. 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 6.
    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.
  6. 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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