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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R Spec V >> Repair and Diagnosis >> External Pages >> Different car >> Section 1611 (Rear Final Drive) >> Trouble Diagnosis For System >> Power Supply Circuit For Differential Lock Control Unit >> Diagnostic Procedure
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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Nissan Frontier. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK POWER SUPPLY 
    1. Turn ignition switch OFF.
    2. Disconnect differential lock control unit harness connector.
    3. Check voltage between differential lock control unit harness connector terminals and ground.
      DIFFERENTIAL LOCK CONTROL UNIT HARNESS CONNECTOR TERMINALS VOLTAGE SPECIFICATIONS

      Connector Terminal Voltage (Approx.)
      M70 1 - Ground 0V
      2 - Ground 0V
      15 - Ground Battery voltage
      Fig 1: Checking Voltage Between Connector M70 Terminals 1, 2, 15 And Ground
      G03595809Courtesy of NISSAN MOTOR CO., U.S.A.
    4. Turn ignition switch ON. (Do not start engine.)
    5. Check voltage between differential lock control unit harness connector terminals and ground.
      DIFFERENTIAL LOCK CONTROL UNIT HARNESS CONNECTOR TERMINALS VOLTAGE SPECIFICATIONS

      Connector Terminal Voltage (Approx.)
      M70 1 - Ground Battery voltage
      2 - Ground
      15 - Ground
      Fig 2: Checking Voltage Between Differential Lock Control Unit Harness Connector Terminals And Ground
      G03595810Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG 

    • OK: GO TO 2.
    • NG: Check the following. If any items are damaged, repair or replace damaged parts.
      • 10A fuse [No. 3 or 19, located in fuse block (J/B)]
      • Harness for short or open between battery and differential lock control unit harness connector terminal 15
      • Harness for short or open between ignition switch and differential lock control unit harness connector terminals 1 and 2
      • Battery and ignition switch. Refer to "POWER SUPPLY ROUTING CIRCUIT ".
  2. CHECK GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Check continuity between differential lock control unit harness connector M70 terminals 3, 10 and ground.

      Continuity should exist. 

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

    OK or NG 

    • OK: GO TO 3.
    • NG: Repair open circuit or short to ground or short to power in harness or connectors.
      Fig 3: Checking Continuity Between Connector M70 Terminals 3, 10 And Ground
      G03595811Courtesy of NISSAN MOTOR CO., U.S.A.
  3. CHECK DIFFERENTIAL LOCK CONTROL UNIT 

    Check differential lock control unit input/output signal. Refer to "DIFFERENTIAL LOCK CONTROL UNIT INPUT/OUTPUT SIGNAL REFERENCE VALUES ".

    OK or NG 

    • OK: GO TO 4.
    • NG: Check differential lock control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.
  4. CHECK DTC 

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

    OK or NG 

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