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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 834 (Transfer Case) >> ATX14B >> Trouble Diagnosis For System >> Transfer 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 TRANSFER MOTOR RELAY 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 "MOTOR RELAY" and "MOTOR RELAY MON".
      DISPLAY VALUE CONDITION

      Monitored item Condition Display value (Approx.)
      MOTOR RELAY
      • Accelerator pedal depressed
      • Vehicle stopped
      • Engine running
      • Brake pedal depressed
      		 4WD shift switch: 2WD OFF
      4WD shift switch: AUTO or 4LO (A/T selector lever "P" or "N" position) OFF ("ON" for approx. 2 sec. after shifting to "P" and "N".)
      4WD shift switch: AUTO or 4LO (Except for A/T selector lever "P" or "N" position) ON
      4WD shift switch: 4H (A/T selector lever "P" position) OFF ("ON" for approx. 2 sec. after shifting to "P".)
      4WD shift switch: 4H (Except for A/T selector lever "P" position) ON
      MOTOR RELAY MON
      • Accelerator pedal depressed
      • Vehicle stopped
      • Engine running
      • Brake pedal depressed
      		 4WD shift switch: 2WD OFF
      4WD shift switch: AUTO or 4LO (A/T selector lever "P" or "N" position) OFF ("ON" for approx. 2 sec. after shifting to "P" and "N".)
      4WD shift switch: AUTO or 4LO (Except for A/T selector lever "P" or "N" position) ON
      4WD shift switch: 4H (A/T selector lever "P" position) OFF ("ON" for approx. 2 sec. after shifting to "P".)
      4WD shift switch: 4H (Except for A/T selector lever "P" position) ON

    Without CONSULT-II 

    1. Start engine.
      Fig 1: Identifying CONSULT-II Display - DATA MONITOR
      G04901533
    2. Check voltage between transfer control unit harness connector terminal and ground.
      CONNECTOR TERMINAL VOLTAGE REFERENCE

      Connector Terminal Condition Voltage (Approx.)
      M152 14 - Ground
      • Accelerator pedal depressed
      • Vehicle stopped
      • Engine running
      • Brake pedal depressed
      		 4WD shift switch: 2WD Battery voltage
      4WD shift switch: AUTO or 4LO (A/T selector lever "P" or "N" position) Battery voltage (0V for approx. 2 sec. after shifting to "P" and "N".)
      4WD shift switch: AUTO or 4LO (Except for A/T selector lever "P" or "N" position) 0V
      4WD shift switch: 4H (A/T selector lever "P" position) Battery voltage (0V for approx. 2 sec. after shifting to "P".)
      4WD shift switch: 4H (Except for A/T selector lever "P" position) 0V
      M153 41 - Ground
      • Accelerator pedal depressed
      • Vehicle stopped
      • Engine running
      • Brake pedal depressed
      		 4WD shift switch: 2WD 0V
      4WD shift switch: AUTO or 4LO (A/T selector lever "P" or "N" position) 0V (Battery voltage for approx. 2 sec. after shifting to "P" and "N".)
      4WD shift switch: AUTO or 4LO (Except for A/T selector lever "P" or "N" position) Battery voltage
      4WD shift switch: 4H (A/T selector lever "P" position) 0V (Battery voltage for approx. 2 sec. after shifting to "P".)
      4WD shift switch: 4H (Except for A/T selector lever "P" position) Battery voltage
      Fig 2: Checking Voltage Between Transfer Control Unit Harness Connector Terminal And Ground
      G04901534

    OK or NG 

    OK: GO TO  8.

    NG: GO TO 2.

  2. CHECK TRANSFER MOTOR RELAY POWER SUPPLY CIRCUIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Connect transfer control unit harness connector.
    3. Disconnect transfer motor relay.
    4. Check voltage between transfer motor relay harness connector terminals and ground.
      CONNECTOR TERMINAL VOLTAGE REFERENCE

      Connector Terminal Voltage (Approx.)
      E153 2 - Ground 0V
      E154 5 - Ground Battery voltage
      Fig 3: Checking Voltage Between Transfer Motor Relay Harness Connector Terminals And Ground
      G04901535
    5. Turn ignition switch "ON". (Do not start engine.)
    6. Check voltage between transfer motor relay harness connector terminals and ground.
      CONNECTOR TERMINAL VOLTAGE REFERENCE

      Connector Terminal Voltage (Approx.)
      E153 2 - Ground Battery voltage
      E154 5 - Ground Battery voltage
      Fig 4: Checking Voltage Between Transfer Motor Relay Harness Connector Terminals And Ground
      G04901536

    OK or NG 

    OK: GO TO 3.

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

    • 20A fuse (No. 57, located in the fuse and relay box). Refer to "POWER SUPPLY ROUTING CIRCUIT ".
    • 10A fuse (No. 59, located in the fuse and relay box). Refer to "POWER SUPPLY ROUTING CIRCUIT ".
    • Harness for short or open between battery and transfer motor relay harness connector E154 terminals 5.
    • Harness for short or open between transfer shut off relay harness connector E155 terminal 5 and transfer motor relay harness connector E153 terminal 2.
    • Battery and ignition switch. Refer to "POWER SUPPLY ROUTING CIRCUIT ".
  3. CHECK TRANSFER MOTOR RELAY 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Remove transfer motor relay. Refer to "LOCATION OF ELECTRICAL PARTS ".
    3. Apply 12V direct current between transfer motor relay terminals 1 and 2.
    4. Check continuity between relay terminals 3 and 5.
      CONNECTOR TERMINAL CONTINUITY REFERENCE

      Condition Continuity
      12V direct current supply between terminals 1 and 2 Yes
      OFF No
      Fig 5: Checking Continuity Between Relay Terminals 3 And 5
      G04901537

    OK or NG 

    OK: GO TO 4.

    NG: Replace the transfer motor relay. Refer to "LOCATION OF ELECTRICAL PARTS ".

  4. CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND TRANSFER MOTOR RELAY 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connector.
    3. Remove transfer motor relay. Refer to "LOCATION OF ELECTRICAL PARTS "
    4. Check continuity between the following terminals.
      • Transfer control unit harness connector M152 terminal 14 and transfer motor relay harness connector E154 terminal 1.

        Continuity should exist. 

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

        Fig 6: Checking Continuity Between Transfer Control Unit Connector Terminal And Transfer Motor Relay Connector Terminal
        G04901538

    OK or NG 

    OK: GO TO 5.

    NG: Repair or replace damaged parts.

  5. CHECK TRANSFER MOTOR POWER SUPPLY CIRCUIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer control unit harness connector and transfer motor harness connector.
    3. Remove transfer motor relay. Refer to "LOCATION OF ELECTRICAL PARTS ".
    4. Check continuity between the following terminals.
      • Transfer control unit harness connector M153 terminal 41 and transfer motor relay harness connector E154 terminal 3.
      • Transfer control unit harness connector M153 terminal 41 and transfer motor harness connector F57 terminal 14.

        Continuity should exist. 

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

        Fig 7: Checking Continuity Between Transfer Control Unit Connector Terminal And Transfer Motor Connector Terminal
        G04910125

    OK or NG 

    OK: GO TO 6.

    NG: Repair or replace damaged parts.

  6. CHECK TRANSFER MOTOR GROUND CIRCUIT 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer motor harness connector.
    3. Check continuity between transfer motor harness connector F57 terminal 15 and ground.

      Continuity should exist. 

      Also check harness for short to power.

      Fig 8: Checking Continuity Between Transfer Motor Harness Connector F57 Terminal 15 And Ground
      G04901540

    OK or NG 

    OK: GO TO 7.

    NG: Repair open circuit or short to power in harness or connectors.

  7. CHECK TRANSFER MOTOR 
    1. Turn ignition switch "OFF". (Stay for at least 5 seconds.)
    2. Disconnect transfer motor harness connector.
    3. Apply 12V direct current between transfer motor terminals 14 and 15.
      4. Fig 9: Applying 12V Direct Current Between Transfer Motor Terminals 14 And 15
      G04901541

    Does transfer motor operate? 

    YES: GO TO 8.

    NO: Replace transfer motor. Refer to "REMOVAL AND INSTALLATION ".

  8. 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 9.

    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.

  9. 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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