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Home › Nissan-Datsun › 2012 › Pathfinder S, 4WD › Repair and Diagnosis › Engine Performance › System › Engine Control System - Component Testing (VQ40DE) › VIAS › Diagnosis Procedure

Diagnosis Procedure

  1. CHECK OVERALL FUNCTION

    With CONSULT 

    1. Start engine and warm it up to normal operating temperature.
    2. Perform "VIAS S/V-1" in "ACTIVE TEST" mode with CONSULT.
    3. Turn VIAS control solenoid valve "ON" and "OFF", and make sure that power valve actuator rod moves.
    Fig 1: Moving Power Valve Actuator Rod
    G08170829Courtesy of NISSAN NORTH AMERICA, INC.

    Without CONSULT 

    1. Start engine and warm it up to normal operating temperature.
    2. Rev engine up to between 2, 200 and 3, 300 RPM and make sure that power valve actuator rod moves.

    OK or NG 

    OK: INSPECTION END 

    NG (With CONSULT) >>GO TO 2.

    NG (Without CONSULT) >>GO TO  3.

    Fig 2: Moving Power Valve Actuator Rod
    G08170830Courtesy of NISSAN NORTH AMERICA, INC.
  2. CHECK VACUUM EXISTENCE

    With CONSULT 

    1. Stop engine and disconnect vacuum hose connected to power valve actuator.
    2. Start engine and let it idle.
    3. Perform "VIAS S/V-1" in "ACTIVE TEST" mode with CONSULT.
    4. Turn VIAS control solenoid valve "ON" and "OFF", and check vacuum existence under the following conditions.
    VIAS SOL VALVE Vacuum
    ON Should exist.
    OFF Should not exist.

    OK or NG 

    OK: Repair or replace power valve actuator. Refer to "EXPLODED VIEW ".

    NG: GO TO  4.

  3. CHECK VACUUM EXISTENCE

    Without CONSULT 

    1. Stop engine and disconnect vacuum hose connected to power valve actuator.
    2. Disconnect VIAS control solenoid valve harness connector.
    3. Start engine and let it idle.
    4. Apply 12V of direct current between VIAS control solenoid valve terminals 1 and 2.
    5. Check vacuum existence under the following conditions.
    Condition Vacuum
    12V direct current supply Should exist.
    No supply Should not exist.

    OK or NG 

    OK: Repair or replace power valve actuator. Refer to "EXPLODED VIEW ".

    NG: GO TO 4.

    Fig 3: Applying 12V Of Direct Current Between VIAS Control Solenoid Valve Terminals 1 And 2
    G08170831Courtesy of NISSAN NORTH AMERICA, INC.
  4. CHECK VACUUM HOSE
    1. Stop engine.
    2. Check hoses and tubes between intake manifold and power valve actuator for cracks, clogging, improper connection or disconnection. Refer to "VACUUM HOSE DRAWING ".

    OK or NG 

    OK: GO TO 5.

    NG: Repair hoses or tubes.

    Fig 4: Checking Vacuum Hoses And Tubes
    G08170832Courtesy of NISSAN NORTH AMERICA, INC.
  5. CHECK VACUUM TANK

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 6.

    NG: Replace vacuum tank. Refer to "REMOVAL AND INSTALLATION ".

  6. CHECK VIAS CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT
    1. Turn ignition switch OFF.
    2. Disconnect VIAS control solenoid valve harness connector.
    3. Turn ignition switch ON.
      Fig 5: Identifying VIAS Control Solenoid Valve And Power Valve Actuator
      G08170833Courtesy of NISSAN NORTH AMERICA, INC.
    4. Check voltage between terminal 1 and ground with CONSULT or tester.

    Voltage: Battery voltage 

    OK or NG 

    OK: GO TO  8.

    NG: GO TO 7.

    Fig 6: Checking Voltage Between Terminal 1 And Ground Using Tester
    G08170834Courtesy of NISSAN NORTH AMERICA, INC.
  7. DETECT MALFUNCTIONING PART

    Check the following.

    • Harness connectors E2, F32
    • Harness for open or short between VIAS control solenoid valve and IPDM E/R
    • Harness for open or short between VIAS control solenoid valve and ECM

    Repair harness or connectors.

  8. CHECK VIAS CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between ECM terminal 29 and VIAS control solenoid valve terminal 2.

      Refer to WIRING DIAGRAM .

      Continuity should exist  .

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

    OK or NG 

    OK: GO TO 9.

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

  9. CHECK VIAS CONTROL SOLENOID VALVE

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 10.

    NG: Replace VIAS control solenoid valve. Refer to "REMOVAL AND INSTALLATION ".

  10. CHECK INTERMITTENT INCIDENT

    Refer to "INTERMITTENT INCIDENT ".

    INSPECTION END 

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