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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 910 (Transfer Case) >> DTC/Circuit Diagnosis >> DTC P1819: Transfer Control Device >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM ".

  1. CHECK POWER SUPPLY 
    1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
    2. Connect transfer control unit harness connector.
    3. Check voltage between transfer control unit harness connector terminal and ground.
      Connector Terminal Voltage (Approx.)
      E142 16 - Ground 0V
      22 - Ground
      E143 30 - Ground Battery voltage
      Fig 1: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground
      G04901509Courtesy of NISSAN NORTH AMERICA, INC.
    4. Turn ignition switch ON. (Do not start engine.)
    5. Check voltage between transfer control unit harness connector terminals and ground.
      Connector Terminal Voltage (Approx.)
      E142 16 - Ground Battery voltage
      22 - Ground
      E143 30 - Ground 0V
      Fig 2: Checking Voltage Between Transfer Control Unit Harness Connector Terminals E142, E143 And Ground
      G04901510Courtesy of NISSAN NORTH AMERICA, INC.

      Are the inspection results normal? 

      YES: GO TO 2.

      NO: Check the following. If any items are damaged, repair or replace damaged parts.

      • 10A fuse (No. 26 located in the fuse and fusible link box).
      • Harness for short or open between battery and transfer shut off relay harness connector E69 terminal 1.
      • Harness for short or open between transfer shut off relay harness connector E69 terminal 2 and transfer control unit harness connector E143 terminal 30.
      • Harness for short or open between battery and transfer shut off relay harness connector E69 terminal 5.
      • Harness for short or open between transfer shut off relay harness connector E69 terminal 3 and transfer control unit harness connector E142 terminal 22.
      • Transfer shut off relay. Refer to "COMPONENT INSPECTION ".
  2. CHECK GROUND CIRCUIT 
    1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connector.
    3. Check continuity between transfer control unit harness connector E142 terminals 3, 6, E143 terminal 45 and ground.

      Continuity should exist. 

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

      Are the inspection results normal? 

      YES: GO TO 3.

      NO: Repair open circuit or short to ground or short to power in harness or connectors.

      Fig 3: Checking Continuity Between Transfer Control Unit Harness Connector E142 Terminals 3, 6, E143 Terminal 45 And Ground
      G04901468Courtesy of NISSAN NORTH AMERICA, INC.
  3. CHECK ACTUATOR MOTOR 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 "COMPONENT PARTS LOCATION ".
    3. Check voltage between transfer shift high relay harness connector E46 terminal 5 (A), transfer shift low relay harness connector E47 terminal 5 (B) and ground.
      Connector Terminal Voltage (Approx.)
      A: E46 5 - Ground Battery voltage
      B: E47 5 - Ground
      Fig 4: Checking Voltage Between Transfer Shift High Relay Harness Connector E46 Terminal 5 (A), Transfer Shift Low Relay Harness Connector E47 Terminal 5 (B)
      G04901491Courtesy of NISSAN NORTH AMERICA, INC.
    4. Turn ignition switch ON. (Do not start engine.)
    5. Check voltage between transfer shift high relay harness connector E46 terminal 5 (A), transfer shift low relay harness connector E47 terminal 5 (B) and ground.
      Connector Terminal Voltage (Approx.)
      A: E46 5 - Ground Battery voltage
      B: E47 5 - Ground
      Fig 5: Checking Voltage Between Transfer Shift High Relay Harness Connector E46 Terminal 5 (A) And Ground
      G04901492Courtesy of NISSAN NORTH AMERICA, INC.

      Are the inspection results normal? 

      YES: GO TO 4.

      NO: Check the following. If any items are damaged, repair or replace damaged parts.

      • 20A fuse (No. 57 located in the fuse and relay box).
      • Harness for short or open between battery, transfer shift high relay harness connector E46 terminal 5 and transfer shift low relay harness connector E47 terminal 5.
  4. CHECK 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 and transfer control device (actuator motor) 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 E143 terminal 33 (A) and transfer shift high relay harness connector E46 terminal 3 (B).
      • Transfer control unit harness connector E143 terminal 42 (A) and transfer shift low relay harness connector E47 terminal 3 (C).

        Continuity should exist. 

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

      Fig 6: Checking Harness Between Transfer Control Unit And Shift Relay
      G04901497Courtesy of NISSAN NORTH AMERICA, INC.

      Are the inspection results normal? 

      YES: GO TO 5.

      NO: Repair or replace damaged parts.

  5. CHECK TRANSFER SHIFT RELAY GROUND CIRCUIT 
    1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
    2. Remove transfer shift high relay and transfer shift low relay.
    3. Check continuity between transfer shift high relay harness connector E46 terminals 2, 4 (A), transfer shift low relay harness connector E47 terminals 2, 4 (B) and ground.

      Continuity should exist. 

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

      Fig 7: Checking Continuity Between Transfer Shift High Relay Harness Connector E46 Terminals 2, 4 (A), Transfer Shift Low Relay Harness Connector E47 Terminals 2
      G04901493Courtesy of NISSAN NORTH AMERICA, INC.

      Are the inspection results normal? 

      YES: GO TO 6.

      NO: Repair open circuit or short to ground or short to power in harness or connectors.

  6. CHECK TRANSFER CONTROL UNIT 

    Check transfer control unit input/output signal. Refer to "REFERENCE VALUE ".

    Are the inspection results normal? 

    YES-1: With CONSULT: GO TO 7.

    YES-2: Without CONSULT: GO TO  8.

    NO: Check transfer control unit pin terminals for damage or loose connection with harness connector. If any items are damaged, repair or replace damaged parts.

  7. PERFORM SELF-DIAGNOSIS (WITH CONSULT) 

    With CONSULT 

    1. Turn ignition switch ON. (Do not start engine.)
    2. Select SELF-DIAG RESULTS mode for ALL MODE AWD/4WD with CONSULT.
    3. Touch ERASE.
    4. Turn ignition switch OFF and wait at least 10 seconds.
    5. Perform the self-diagnosis again.

      Is the SHIFT ACT CIR [P1819] displayed? 

      YES: Replace transfer control unit. Refer to "REMOVAL AND INSTALLATION ".

      NO: Inspection End.

  8. PERFORM SELF-DIAGNOSIS (WITHOUT CONSULT) 

    Without CONSULT 

    1. Perform the self-diagnosis and then erase self-diagnostic results. Refer to "CONSULT FUNCTION (ALL MODE AWD/4WD) ".
    2. Perform the self-diagnosis again.

      Do the self-diagnostic results indicate transfer control device? 

      YES: Replace transfer control unit. Refer to "REMOVAL AND INSTALLATION ".

      NO: Inspection End.

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