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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1063 (Transfer Case (ATX14B)) >> DTC/Circuit Diagnosis >> DTC P1823: 2-4 Solenoid >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. 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 4WD SHIFT SWITCH SYSTEM

    Perform self-diagnosis. Refer to "CONSULT FUNCTION (ALL MODE AWD/4WD) ".

    Is the "4WD MOD SW [P1814]" (with CONSULT) or "Flickering pattern: 16" (without CONSULT) detected? 

    YES: Perform trouble diagnosis for 4WD shift switch. Refer to "DIAGNOSIS PROCEDURE ".

    NO: GO TO 2

  2. CHECK 2-4WD SHIFT SOLENOID SIGNAL

    With CONSULT 

    1. Start engine.
    2. Select "DATA MONITOR" mode for "ALL MODE AWD/4WD" with CONSULT.
    3. Read out the value of "2-4WD SOL" and "2-4WD SOL MON".
      Monitored item Condition Display value
      2-4WD SOL
      • Vehicle stopped
      • Engine running
      • A/T selector lever "N" position
      • Brake pedal depressed
      		 4WD shift switch: 2WD OFF
      4WD shift switch: AUTO ON
      4WD shift switch: 4H
      4WD shift switch: 4LO
      4WD shift switch: AUTO ("Wait" function is operating.) OFF
      4WD shift switch: 4H ("Wait" function is operating.) OFF
      2-4WD SOL MON
      • Vehicle stopped
      • Engine running
      • A/T selector lever "N" position
      • Brake pedal depressed
      		 4WD shift switch: 2WD OFF
      4WD shift switch: AUTO ON
      4WD shift switch: 4H
      4WD shift switch: 4LO
      4WD shift switch: AUTO ("Wait" function is operating.) OFF
      4WD shift switch: 4H ("Wait" function is operating.) OFF

    Without CONSULT 

    1. Start engine.
    2. Check voltage between transfer control unit harness connector terminal and ground.
      Connector Terminal Condition Voltage (Approx.)
      M152 1 - Ground
      • Vehicle stopped
      • Engine running
      • A/T selector lever "N" position
      • Brake pedal depressed
      		 4WD shift switch: 2WD 0V
      4WD shift switch: AUTO, 4H or 4LO Battery voltage
      Fig 1: Checking Voltage Between Transfer Control Unit Harness Connector Terminal 1 And Ground
      G08165864Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO  7.

      NG: GO TO 3.

  3. CHECK 4WD SHIFT SWITCH SIGNAL
    1. Turn ignition switch "ON". (Do not start engine.)
    2. Check voltage between transfer control unit harness connector terminals and ground.
      Connector Terminal Condition Voltage (Approx.)
      M141 4 - ground 4WD shift switch: AUTO, 4H or 4LO Battery voltage
      4WD shift switch: 2WD 0V
      Fig 2: Checking Voltage Between Transfer Control Unit Harness Connector Terminal 4 And Ground
      G08165865Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO 4.

      NG: Check 4WD shift switch. Refer to "COMPONENT INSPECTION ".

  4. CHECK HARNESS BETWEEN 4WD SHIFT SWITCH AND TRANSFER TERMINAL CORD ASSEMBLY
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect 4WD shift switch harness connector and transfer terminal cord assembly harness connector.
    3. Check continuity between 4WD shift switch harness connector M141 terminal 4 and transfer terminal cord assembly harness connector F56 terminal 5.

      Continuity should exist  .

      Fig 3: Checking Continuity Between 4Wd Shift Switch Harness Connector M141 Terminal 4 And Transfer Terminal Cord Assembly Harness Connector F56 Terminal 5
      G08165866Courtesy of NISSAN NORTH AMERICA, INC.

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

      OK or NG 

      OK: GO TO 5.

      NG: Repair or replace damaged parts.

  5. 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 transfer control unit harness connector M152 terminal 1 and transfer terminal cord assembly harness connector F56 terminal 4.

      Continuity should exist  .

      Fig 4: Checking Continuity Between Transfer Control Unit Connector M152 Terminal 1 And Transfer Terminal Cord Assembly Connector F56 Terminal 4
      G08165867Courtesy of NISSAN NORTH AMERICA, INC.

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

      OK or NG 

      OK: GO TO 6.

      NG: Repair or replace damaged parts.

  6. CHECK 2-4WD SOLENOID
    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 4 and 5.

      4 - 5: Approx. 22.8 - 25.2 Ω 

      Fig 5: Checking Resistance Between Transfer Terminal Cord Assembly Terminals 4 And 5
      G08165868Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO 7.

      NG: 2-4WD solenoid is malfunctioning. Refer to "COMPONENT PARTS LOCATION ".

  7. CHECK TRANSFER CONTROL UNIT

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

    OK or NG 

    OK: GO TO 8.

    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.

  8. 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 "REMOVAL AND INSTALLATION ".

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