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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2036 (Transfer Case) >> TX15B >> Trouble Diagnosis For System >> Actuator Motor >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2007 Nissan Pathfinder. 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", "SHIFT AC MON2".
      DISPLAY VALUE CONDITION

      Monitored item Condition Display value
      SHIFT ACT1
      • Vehicle stopped
      • Engine running
      • A/T selector lever "N" position
      • Brake pedal depressed
      		 4WD shift switch: 2WD to 4H or 4H to 4LO or 2WD to 4LO ON
      Except the above OFF
      SHIFT AC MON1 4WD shift switch: 2WD to 4H or 4H to 4LO or 2WD to 4LO ON
      Except the above OFF
      SHIFT ACT2 4WD shift switch: 4LO to 4H or 4H to 2WD or 4LO to 2WD ON
      Except the above OFF
      SHIFT AC MON2 4WD shift switch: 4LO to 4H or 4H to 2WD or 4LO to 2WD ON
      Except the above OFF
      Fig 1: Identifying CONSULT II - DATA MONITOR Screen
      G04901489

    Without CONSULT-II 

    1. Start engine.
    2. Depress brake pedal and stop vehicle.
    3. Set A/T selector lever to "N" position.
    4. Check voltage between transfer control unit harness connector terminal and ground.
      CONNECTOR TERMINAL VOLTAGE REFERENCE

      Connector Terminal Condition Voltage (Approx.)
      M153 28 - Ground When 4WD shift switch is operated (While actuator motor is operating.) Battery voltage → 0V
      When 4WD shift switch is not operated 0V
      31 - Ground Always 0V
      42 - Ground
      • Vehicle stopped
      • Engine running
      • A/T selector lever "N" position
      • Brake pedal depressed
      		 4WD shift switch: 2WD to 4H or 4H to 4LO or 2WD to 4LO 0V
      Except the above Battery voltage
      Fig 2: Checking Voltage Between Transfer Control Unit Connector Terminal And Ground
      G04898438
      CONNECTOR TERMINAL VOLTAGE REFERENCE

      Connector Terminal Condition Voltage (Approx.)
      M153 47 - Ground
      • Vehicle stopped
      • Engine running
      • A/T selector lever "N" position
      • Brake pedal depressed
      		 4WD shift switch: 2WD to 4H or 4H to 4LO or 2WD to 4LO Battery voltage → 0V
      Except the above 0V
      48 - Ground 4WD shift switch: 4LO to 4H or 4H to 2WD or 4LO to 2WD Battery voltage → 0V
      Except the above 0V
      50 - Ground 4WD shift switch: 4LO to 4H or 4H to 2WD or 4LO to 2WD 0V
      Except the above Battery voltage

    OK or NG 

    OK: GO TO  9.

    NG: GO TO 2.

  2. CHECK ACTUATOR MOTOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connector.
    3. Check voltage between transfer control unit harness connector terminal 27 and ground.
      CONNECTOR TERMINAL VOLTAGE REFERENCE

      Connector Terminal Voltage (Approx.)
      M153 27 - Ground 0V
      Fig 3: Checking Voltage Between Transfer Control Unit Harness Connector Terminal 27 And Ground
      G04910433
    4. Turn ignition switch "ON".
    5. Check voltage between transfer control unit harness connector terminal 27 and ground.
      CONNECTOR TERMINAL VOLTAGE REFERENCE

      Connector Terminal Voltage (Approx.)
      M153 27 - Ground Battery voltage
      Fig 4: Checking Voltage Between Transfer Control Unit Connector Terminal 27 And Ground
      G04898440

    OK or NG 

    OK: GO TO 3.

    NG:

    1. Check harness for short or open between transfer control unit harness connector M153 terminal 27 and transfer shut off relay 2 harness connector E157 terminal 5 and 10A fuse (No. 57, located in the fuse and relay block). If any items are damaged, repair or replace damaged parts.
    2. Perform trouble diagnosis for power supply circuit. Refer to "POWER SUPPLY CIRCUIT FOR TRANSFER CONTROL UNIT ".
  3. CHECK TRANSFER RELAY 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. Refer to "LOCATION OF ELECTRICAL PARTS ".
    3. Check voltage between transfer control unit harness connector terminal and ground.
      CONNECTOR TERMINAL VOLTAGE REFERENCE

      Connector Terminal Voltage (Approx.)
      E46 2 - Ground 0V
      E47 2 - Ground 0V
      Fig 5: Checking Voltage Between Transfer Control Unit Connector Terminal And Ground
      G04898441
    4. Turn ignition switch "ON". (Do not start engine.)
    5. Check voltage between transfer control unit harness connector terminal and ground.
      CONNECTOR TERMINAL VOLTAGE REFERENCE

      Connector Terminal Voltage (Approx.)
      E46 2 - Ground Battery voltage
      E47 2 - Ground Battery voltage
      Fig 6: Checking Voltage Between Transfer Control Unit Connector Terminal And Ground
      G04898442

    OK or NG 

    OK: GO TO 4.

    NG: Check the following. If any items are damaged, repair or replace damaged parts.

    • Harness for short or open between transfer control unit harness connector terminal 27 and transfer shift high relay harness connector E46 terminal 2.
    • Harness for short or open between transfer control unit harness connector terminal 27 and transfer shift low relay harness connector terminal E47 terminal 2.
  4. CHECK TRANSFER RELAY 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Remove transfer shift high relay and transfer shift low relay.
    3. Apply 12V direct current between transfer shift high and low relay terminals 1 and 2.
    4. Check continuity between relay terminals 3 and 4, 3 and 5.
      CONNECTOR TERMINAL CONTINUITY REFERENCE

      Terminal Condition Continuity
      3 - 4 12V direct current supply between terminals 1 and 2 No
      OFF Yes
      3 - 5 12V direct current supply between terminals 1 and 2 Yes
      OFF No

    OK or NG 

    OK: GO TO 5.

    NG: Replace the transfer shift high or low relay.

    Fig 7: Checking Continuity Between Relay Terminals 3 And 4, 3 And 5
    G04898443
  5. CHECK (1): 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.
    3. Remove transfer shift high relay and transfer shift low relay.
    4. Check continuity between the following terminals.
      • Transfer control unit harness connector M153 terminal 42 and transfer shift high relay harness connector E46 terminal 1.
      • Transfer control unit harness connector M153 terminal 50 and transfer shift low relay harness connector E47 terminal 1.

        Continuity should exist. 

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

        Fig 8: Checking Continuity Between Transfer Control Unit And Transfer Shift Relay Connector Terminals
        G04898444

    OK or NG 

    OK: GO TO 6.

    NG: Repair or replace damaged parts.

  6. CHECK (2): 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.
    3. Remove transfer shift high relay and transfer shift low relay.
    4. Check continuity between the following terminals.
      • Transfer control unit harness connector M153 terminal 28 and transfer shift high relay harness connector E46 terminal 5.
      • Transfer control unit harness connector M153 terminal 28 and transfer shift low relay harness connector E47 terminal 5.
      • Transfer control unit harness connector M153 terminal 31 and transfer shift high relay harness connector E46 terminal 4.
      • Transfer control unit harness connector M153 terminal 31 and transfer shift low relay harness connector E47 terminal 4.

        Continuity should exist. 

        Fig 9: Checking Continuity Between Transfer Control Unit And Transfer Shift High / Low Relay Connector Terminals
        G04898445

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

    OK or NG 

    OK: GO TO 7.

    NG: Repair or replace damaged parts.

  7. CHECK ACTUATOR MOTOR OPERATION CIRCUIT 
    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. Check continuity between the following terminals.
      • Transfer control unit harness connector M153 terminal 47 and transfer control device (actuator motor) harness connector F58 terminal 23.
      • Transfer control unit harness connector M153 terminal 48 and transfer control device (actuator motor) harness connector F58 terminal 24.
        Fig 10: Checking Actuator Motor Operation Circuit
        G04898446
      • Transfer control device (actuator motor) harness connector F58 terminal 24 and transfer shift high relay harness connector E46 terminal 3.
      • Transfer control device (actuator motor) harness connector F58 terminal 23 and transfer shift low relay harness connector E47 terminal 3.

        Continuity should exist. 

        Fig 11: Checking Actuator Motor Operation Circuit
        G04898447

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

    OK or NG 

    OK: GO TO 8.

    NG: Repair or replace damaged parts.

  8. 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 23 and 24.
      CAUTION: Be careful not to overheat the harness.
      CONNECTOR TERMINAL VOLTAGE REFERENCE

      Terminal Actuator motor
      24 (Battery voltage) - 23 (Ground) Clockwise rotate
      23 (Battery voltage) - 24 (Ground) Counterclockwise rotate
      3. Fig 12: Applying Battery Voltage To Transfer Control Device (Actuator Motor) Terminals 23 And 24
      G04898448

    Does actuator motor rotate? 

    YES: GO TO 9.

    NO: Replace transfer control device (actuator motor). Refer to "REMOVAL AND INSTALLATION ".

  9. CHECK TRANSFER CONTROL UNIT 

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

    OK or NG 

    OK: GO TO 10.

    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.

  10. CHECK DTC 

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

    OK or NG 

    OK: Inspection End.

    NG: Replace transfer control unit. Refer to "TRANSFER CONTROL UNIT ".

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