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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 Fluid Temperature >> 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 FLUID TEMPERATURE SENSOR 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 "FLUID TEMP SE".
      DIAGNOSTIC PROCEDURE - CONDITION & DISPLAY VALUE

      Condition Display value (Approx.)
      Transfer fluid temperature approx. 20 - 80°C (68 - 176°F) 1.1 - 0.3V
      Fig 1: Identifying "FLUID TEMP SE"
      G02383105Courtesy of NISSAN MOTOR CO., U.S.A.

    Without CONSULT-II 

    1. 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
      G02383106Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 3: Checking Voltage Between Transfer Control Unit Harness Connector Terminals And Ground
      G02383107Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    1. OK: GO TO 4.
    2. NG: GO TO 2.
  2. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND TRANSFER TERMINAL CORD ASSEMBLY 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connector and transfer terminal cord assembly harness connector.
    3. Check continuity between the following terminals.
      • Transfer control unit harness connector E143 terminal 28 (B/G) and transfer terminal cord assembly harness connector F56 terminal 3 (B/G).
      • Transfer control unit harness connector E143 terminal 31 (G) and transfer terminal cord assembly harness connector F56 terminal 2 (G).
      1. Continuity should exist. 

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

    OK or NG 

    1. OK: GO TO 3.
    2. NG: Repair or replace damaged parts.
    Fig 4: Checking Continuity Between Transfer Control Unit Harness Connector And Transfer Terminal Cord Assembly Harness Connector Terminals
    G02383108Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK TRANSFER FLUID TEMPERATURE SENSOR 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer terminal cord assembly harness connector.
    3. Check resistance between transfer terminal cord assembly terminals 2 and 3.
      DIAGNOSTIC PROCEDURE - TEMPERATURE & RESISTANCE

      Temperature °C (°F) Resistance (Approx.)
      20 (68) 2.5 kΩ
      80 (176) 0.3 kΩ

    OK or NG 

    1. OK: GO TO 4.
    2. NG: Replace transfer fluid temperature sensor. Refer to "LOCATION OF ELECTRICAL PARTS ".
    Fig 5: Checking Resistance Between Transfer Terminal Cord Assembly Terminals 2 And 3
    G02383109Courtesy of NISSAN MOTOR CO., U.S.A.
  4. 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 5.
    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.
  5. 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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